task_url stringlengths 30 116 | task_name stringlengths 2 86 | task_description stringlengths 0 14.4k | language_url stringlengths 2 53 | language_name stringlengths 1 52 | code stringlengths 0 61.9k | response_seed stringclasses 1
value | instruction_seed stringlengths 27 14.4k | _source stringclasses 1
value |
|---|---|---|---|---|---|---|---|---|
http://rosettacode.org/wiki/Mouse_position | Mouse position | Task
Get the current location of the mouse cursor relative to the active window.
Please specify if the window may be externally created.
| #EchoLisp | EchoLisp |
(lib 'plot)
(plot-x-minmax 10) ; set logical dimensions of plotting area
(plot-y-minmax 100)
→ (("x" 0 10) ("y" 0 100))
;; press ESC to see the canvas
;; the mouse position is displayed as , for example, [ x: 5.6 y : 88.7]
;; 0 <= x <= 10, 0 <= y <= 100
| Give a code snippet in #EchoLisp
Task
Get the current location of the mouse cursor relative to the active window.
Please specify if the window may be externally created.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Animate_a_pendulum | Animate a pendulum |
One good way of making an animation is by simulating a physical system and illustrating the variables in that system using a dynamically changing graphical display.
The classic such physical system is a simple gravity pendulum.
Task
Create a simple physical model of a pendulum and animate it.
| #Common_Lisp | Common Lisp | (defvar *frame-rate* 30)
(defvar *damping* 0.99 "Deceleration factor.")
(defun make-pendulum (length theta0 x)
"Returns an anonymous function with enclosed state representing a pendulum."
(let* ((theta (* (/ theta0 180) pi))
(acceleration 0))
(if (< length 40) (setf length 40)) ;;avoid a divide-by-ze... | Give a code snippet in #Common_Lisp
One good way of making an animation is by simulating a physical system and illustrating the variables in that system using a dynamically changing graphical display.
The classic such physical system is a simple gravity pendulum.
Task
Create a simple physical model of a pendulum... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Search_a_list | Search a list | Task[edit]
Find the index of a string (needle) in an indexable, ordered collection of strings (haystack).
Raise an exception if the needle is missing.
If there is more than one occurrence then return the smallest index to the needle.
Extra credit
Return the largest index to a needle that has multiple occurrences in ... | #Logo | Logo | to indexof :item :list
if empty? :list [(throw "NOTFOUND 0)]
if equal? :item first :list [output 1]
output 1 + indexof :item butfirst :list
end
to showindex :item :list
make "i catch "NOTFOUND [indexof :item :list]
ifelse :i = 0 [(print :item [ not found in ] :list)] [(print :item [ found at position ] :i [... | Give a code snippet in #Logo
Task[edit]
Find the index of a string (needle) in an indexable, ordered collection of strings (haystack).
Raise an exception if the needle is missing.
If there is more than one occurrence then return the smallest index to the needle.
Extra credit
Return the largest index to a needle tha... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Voronoi_diagram | Voronoi diagram | A Voronoi diagram is a diagram consisting of a number of sites.
Each Voronoi site s also has a Voronoi cell consisting of all points closest to s.
Task
Demonstrate how to generate and display a Voroni diagram.
See algo K-means++ clustering.
| #Go | Go | package main
import (
"fmt"
"image"
"image/color"
"image/draw"
"image/png"
"math/rand"
"os"
"time"
)
const (
imageWidth = 300
imageHeight = 200
nSites = 10
)
func main() {
writePngFile(generateVoronoi(randomSites()))
}
func generateVoronoi(sx, sy []int) imag... | Give a code snippet in #Go
A Voronoi diagram is a diagram consisting of a number of sites.
Each Voronoi site s also has a Voronoi cell consisting of all points closest to s.
Task
Demonstrate how to generate and display a Voroni diagram.
See algo K-means++ clustering.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Balanced_brackets | Balanced brackets | Task:
Generate a string with N opening brackets [ and with N closing brackets ], in some arbitrary order.
Determine whether the generated string is balanced; that is, whether it consists entirely of pairs of opening/closing brackets (in that order), none of which mis-nest.
Examples
(empty) ... | #Yabasic | Yabasic | sub check_brackets(s$)
local level, i
for i = 1 to len(s$)
switch mid$(s$, i, 1)
case "[": level = level + 1 : break
case "]": level = level - 1 : if level < 0 break 2
end switch
next i
return level = 0
end sub
s$ = "[[]][]"
print s$, " = ";
if not check_b... | Give a code snippet in #Yabasic
Task:
Generate a string with N opening brackets [ and with N closing brackets ], in some arbitrary order.
Determine whether the generated string is balanced; that is, whether it consists entirely of pairs of opening/closing brackets (in that order), none of which mis... | christopher/rosetta-code | |
http://rosettacode.org/wiki/First-class_functions/Use_numbers_analogously | First-class functions/Use numbers analogously | In First-class functions, a language is showing how its manipulation of functions is similar to its manipulation of other types.
This tasks aim is to compare and contrast a language's implementation of first class functions, with its normal handling of numbers.
Write a program to create an ordered collection of a m... | #Common_Lisp | Common Lisp | (defun multiplier (f g)
#'(lambda (x) (* f g x)))
(let* ((x 2.0)
(xi 0.5)
(y 4.0)
(yi 0.25)
(z (+ x y))
(zi (/ 1.0 (+ x y)))
(numbers (list x y z))
(inverses (list xi yi zi)))
(loop with value = 0.5
for number in numbers
for inverse in inverses
... | Give a code snippet in #Common_Lisp
In First-class functions, a language is showing how its manipulation of functions is similar to its manipulation of other types.
This tasks aim is to compare and contrast a language's implementation of first class functions, with its normal handling of numbers.
Write a program t... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Colour_bars/Display | Colour bars/Display | Task
Display a series of vertical color bars across the width of the display.
The color bars should either use:
the system palette, or
the sequence of colors:
black
red
green
blue
magenta
cyan
yellow
white
| #ActionScript | ActionScript |
package {
import flash.display.Sprite;
import flash.events.Event;
public class ColourBars extends Sprite {
public function ColourBars():void {
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event = nul... | Give a code snippet in #ActionScript
Task
Display a series of vertical color bars across the width of the display.
The color bars should either use:
the system palette, or
the sequence of colors:
black
red
green
blue
magenta
cyan
yellow
white
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Cyclotomic_polynomial | Cyclotomic polynomial | The nth Cyclotomic polynomial, for any positive integer n, is the unique irreducible polynomial of largest degree with integer coefficients that is a divisor of x^n − 1, and is not a divisor of x^k − 1 for any k < n.
Task
Find and print the first 30 cyclotomic polynomials.
Find and print the order of the first 10... | #Phix | Phix | -- demo\rosetta\Cyclotomic_Polynomial.exw
with javascript_semantics
function degree(sequence p)
for i=length(p) to 1 by -1 do
if p[i]!=0 then return i end if
end for
return -1
end function
function poly_div(sequence n, d)
while length(d)<length(n) do d &=0 end while
integer dn = degree(n),... | Give a code snippet in #Phix
The nth Cyclotomic polynomial, for any positive integer n, is the unique irreducible polynomial of largest degree with integer coefficients that is a divisor of x^n − 1, and is not a divisor of x^k − 1 for any k < n.
Task
Find and print the first 30 cyclotomic polynomials.
Find and p... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sum_of_a_series | Sum of a series | Compute the nth term of a series, i.e. the sum of the n first terms of the corresponding sequence.
Informally this value, or its limit when n tends to infinity, is also called the sum of the series, thus the title of this task.
For this task, use:
S
n
=
∑
k
=
1
n
1
k
2
{\displa... | #Nim | Nim | var s = 0.0
for n in 1..1000: s += 1 / (n * n)
echo s | Give a code snippet in #Nim
Compute the nth term of a series, i.e. the sum of the n first terms of the corresponding sequence.
Informally this value, or its limit when n tends to infinity, is also called the sum of the series, thus the title of this task.
For this task, use:
S
n
=
∑
k
=
1
... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Loops/While | Loops/While | Task
Start an integer value at 1024.
Loop while it is greater than zero.
Print the value (with a newline) and divide it by two each time through the loop.
Related tasks
Loop over multiple arrays simultaneously
Loops/Break
Loops/Continue
Loops/Do-while
Loops/Downward for
Loops/For
Loops/For... | #bc | bc | i = 1024
while (i > 0) {
i
i /= 2
} | Give a code snippet in #bc
Task
Start an integer value at 1024.
Loop while it is greater than zero.
Print the value (with a newline) and divide it by two each time through the loop.
Related tasks
Loop over multiple arrays simultaneously
Loops/Break
Loops/Continue
Loops/Do-while
Loops/Downward f... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Count_in_factors | Count in factors | Task
Write a program which counts up from 1, displaying each number as the multiplication of its prime factors.
For the purpose of this task, 1 (unity) may be shown as itself.
Example
2 is prime, so it would be shown as itself.
6 is not prime; it would be shown as
2
×
3
{\di... | #Elixir | Elixir | defmodule RC do
def factor(n), do: factor(n, 2, [])
def factor(n, i, fact) when n < i*i, do: Enum.reverse([n|fact])
def factor(n, i, fact) do
if rem(n,i)==0, do: factor(div(n,i), i, [i|fact]),
else: factor(n, i+1, fact)
end
end
Enum.each(1..20, fn n ->
IO.puts "#{n}: #{Enum.join(RC... | Give a code snippet in #Elixir
Task
Write a program which counts up from 1, displaying each number as the multiplication of its prime factors.
For the purpose of this task, 1 (unity) may be shown as itself.
Example
2 is prime, so it would be shown as itself.
6 is not prime; it woul... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Biorhythms | Biorhythms | For a while in the late 70s, the pseudoscience of biorhythms was popular enough to rival astrology, with kiosks in malls that would give you your weekly printout. It was also a popular entry in "Things to Do with your Pocket Calculator" lists. You can read up on the history at Wikipedia, but the main takeaway is that u... | #VBA | VBA | Function Biorhythm(Birthdate As Date, Targetdate As Date) As String
'Jagged Array
TextArray = Array(Array("up and rising", "peak"), Array("up but falling", "transition"), Array("down and falling", "valley"), Array("down but rising", "transition"))
DaysBetween = Targetdate - Birthdate
positionP = DaysBetween Mod 2... | Give a code snippet in #VBA
For a while in the late 70s, the pseudoscience of biorhythms was popular enough to rival astrology, with kiosks in malls that would give you your weekly printout. It was also a popular entry in "Things to Do with your Pocket Calculator" lists. You can read up on the history at Wikipedia, bu... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sleep | Sleep | Task
Write a program that does the following in this order:
Input an amount of time to sleep in whatever units are most natural for your language (milliseconds, seconds, ticks, etc.). This unit should be noted in comments or in a description.
Print "Sleeping..."
Sleep the main thread for the given amount of time.
... | #ALGOL_68 | ALGOL 68 | # using ping to sleep #
INT milliseconds = read int; # ping uses milliseconds #
print ("Sleeping...");
VOID (system ("ping 0.0.0.1 -n 1 -w " + whole (milliseconds, 0) + " >NUL"));
# 0.0.0.1 is an invalid IP address and cannot be used, so this will never conflict with a real IP address #
# ping -n gives number of tries,... | Give a code snippet in #ALGOL_68
Task
Write a program that does the following in this order:
Input an amount of time to sleep in whatever units are most natural for your language (milliseconds, seconds, ticks, etc.). This unit should be noted in comments or in a description.
Print "Sleeping..."
Sleep the main thr... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Address_of_a_variable | Address of a variable |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Sidef | Sidef | var n = 42;
say Sys.refaddr(\n); # prints the address of the variable
say Sys.refaddr(n); # prints the address of the object at which the variable points to | Give a code snippet in #Sidef
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sorting_algorithms/Gnome_sort | Sorting algorithms/Gnome sort |
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O(n log2n) sorts
Shell Sort
... | #Ada | Ada | generic
type Element_Type is private;
type Index is (<>);
type Collection is array(Index) of Element_Type;
with function "<=" (Left, Right : Element_Type) return Boolean is <>;
procedure Gnome_Sort(Item : in out Collection); | Give a code snippet in #Ada
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sort_an_integer_array | Sort an integer array |
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O(n log2n) sorts
Shell Sort
... | #R | R | nums <- c(2,4,3,1,2)
sorted <- sort(nums) | Give a code snippet in #R
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Towers_of_Hanoi | Towers of Hanoi | Task
Solve the Towers of Hanoi problem with recursion.
| #AutoIt | AutoIt | Func move($n, $from, $to, $via)
If ($n = 1) Then
ConsoleWrite(StringFormat("Move disk from pole "&$from&" To pole "&$to&"\n"))
Else
move($n - 1, $from, $via, $to)
move(1, $from, $to, $via)
move($n - 1, $via, $to, $from)
EndIf
EndFunc
move(4, 1,2,3) | Give a code snippet in #AutoIt
Task
Solve the Towers of Hanoi problem with recursion.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Compile-time_calculation | Compile-time calculation | Some programming languages allow calculation of values at compile time.
Task
Calculate 10! (ten factorial) at compile time.
Print the result when the program is run.
Discuss what limitations apply to compile-time calculations in your language.
| #Ursala | Ursala | #import nat
x = factorial 10
#executable&
comcal = ! (%nP x)--<''> | Give a code snippet in #Ursala
Some programming languages allow calculation of values at compile time.
Task
Calculate 10! (ten factorial) at compile time.
Print the result when the program is run.
Discuss what limitations apply to compile-time calculations in your language.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Quaternion_type | Quaternion type | Quaternions are an extension of the idea of complex numbers.
A complex number has a real and complex part, sometimes written as a + bi,
where a and b stand for real numbers, and i stands for the square root of minus 1.
An example of a complex number might be -3 + 2i,
wher... | #Java | Java | public class Quaternion {
private final double a, b, c, d;
public Quaternion(double a, double b, double c, double d) {
this.a = a;
this.b = b;
this.c = c;
this.d = d;
}
public Quaternion(double r) {
this(r, 0.0, 0.0, 0.0);
}
public double norm() {
... | Give a code snippet in #Java
Quaternions are an extension of the idea of complex numbers.
A complex number has a real and complex part, sometimes written as a + bi,
where a and b stand for real numbers, and i stands for the square root of minus 1.
An example of a complex number m... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Terminal_control/Unicode_output | Terminal control/Unicode output | The task is to check that the terminal supports Unicode output, before outputting a Unicode character. If the terminal supports Unicode, then the terminal should output a Unicode delta (U+25b3). If the terminal does not support Unicode, then an appropriate error should be raised.
Note that it is permissible to use sys... | #Lasso | Lasso | local(env_vars = sys_environ -> join('###'))
if(#env_vars >> regexp(`(LANG|LC_ALL|LC_CTYPE).*?UTF.*?###`)) => {
stdout('UTF supported \u25b3')
else
stdout('This terminal does not support UTF')
} | Give a code snippet in #Lasso
The task is to check that the terminal supports Unicode output, before outputting a Unicode character. If the terminal supports Unicode, then the terminal should output a Unicode delta (U+25b3). If the terminal does not support Unicode, then an appropriate error should be raised.
Note th... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Letter_frequency | Letter frequency | Task
Open a text file and count the occurrences of each letter.
Some of these programs count all characters (including punctuation),
but some only count letters A to Z.
Other tasks related to string operations:
Metrics
Array length
String length
Copy a string
Empty string (assignment)
Counting
Word frequen... | #Common_Lisp | Common Lisp | (defun letter-freq (file)
(with-open-file (stream file)
(let ((str (make-string (file-length stream)))
(arr (make-array 256 :element-type 'integer :initial-element 0)))
(read-sequence str stream)
(loop for c across str do (incf (aref arr (char-code c))))
(loop for c from 32 to 126 for i from ... | Give a code snippet in #Common_Lisp
Task
Open a text file and count the occurrences of each letter.
Some of these programs count all characters (including punctuation),
but some only count letters A to Z.
Other tasks related to string operations:
Metrics
Array length
String length
Copy a string
Empty string... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Run-length_encoding | Run-length encoding | Run-length encoding
You are encouraged to solve this task according to the task description, using any language you may know.
Task
Given a string containing uppercase characters (A-Z), compress repeated 'runs' of the same character by storing the length of that run, and provide a function to reverse the compression... | #AppleScript | AppleScript | ------------------ RUN-LENGTH ENCODING -----------------
-- encode :: String -> String
on encode(s)
script go
on |λ|(cs)
if {} ≠ cs then
set c to text 1 of cs
set {chunk, residue} to span(eq(c), rest of cs)
(c & (1 + (length of chunk)) as strin... | Give a code snippet in #AppleScript
Run-length encoding
You are encouraged to solve this task according to the task description, using any language you may know.
Task
Given a string containing uppercase characters (A-Z), compress repeated 'runs' of the same character by storing the length of that run, and provide ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Long_multiplication | Long multiplication | Task
Explicitly implement long multiplication.
This is one possible approach to arbitrary-precision integer algebra.
For output, display the result of 264 * 264.
Optionally, verify your result against builtin arbitrary precision support.
The decimal representation of 264 is:
18,446,744,073,709,551,61... | #Go | Go | // Long multiplication per WP article referenced by task description.
// That is, multiplicand is multiplied by single digits of multiplier
// to form intermediate results. Intermediate results are accumulated
// for the product. Used here is the abacus method mentioned by the
// article, of summing intermediate resu... | Give a code snippet in #Go
Task
Explicitly implement long multiplication.
This is one possible approach to arbitrary-precision integer algebra.
For output, display the result of 264 * 264.
Optionally, verify your result against builtin arbitrary precision support.
The decimal representation of 264 is... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Doubly-linked_list/Element_definition | Doubly-linked list/Element definition | Task
Define the data structure for a doubly-linked list element.
The element should include a data member to hold its value and pointers to both the next element in the list and the previous element in the list.
The pointers should be mutable.
See also
Array
Associative array: Creation, Iteration
Collections
... | #Perl | Perl | my %node = (
data => 'say what',
next => \%foo_node,
prev => \%bar_node,
);
$node{next} = \%quux_node; # mutable | Give a code snippet in #Perl
Task
Define the data structure for a doubly-linked list element.
The element should include a data member to hold its value and pointers to both the next element in the list and the previous element in the list.
The pointers should be mutable.
See also
Array
Associative array: Cre... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sum_multiples_of_3_and_5 | Sum multiples of 3 and 5 | Task
The objective is to write a function that finds the sum of all positive multiples of 3 or 5 below n.
Show output for n = 1000.
This is is the same as Project Euler problem 1.
Extra credit: do this efficiently for n = 1e20 or higher.
| #Racket | Racket |
#lang racket
(require math)
;;; A naive solution
(define (naive k)
(for/sum ([n (expt 10 k)]
#:when (or (divides? 3 n) (divides? 5 n)))
n))
(for/list ([k 7]) (naive k))
;;; Using the formula for an arithmetic sum
(define (arithmetic-sum a1 n Δa)
; returns a1+a2+...+an
(define an (+ a1 (... | Give a code snippet in #Racket
Task
The objective is to write a function that finds the sum of all positive multiples of 3 or 5 below n.
Show output for n = 1000.
This is is the same as Project Euler problem 1.
Extra credit: do this efficiently for n = 1e20 or higher.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Empty_program | Empty program | Task
Create the simplest possible program that is still considered "correct."
| #TI-83_BASIC | TI-83 BASIC | Give a code snippet in #TI-83_BASIC
Task
Create the simplest possible program that is still considered "correct."
| christopher/rosetta-code | ||
http://rosettacode.org/wiki/Loop_over_multiple_arrays_simultaneously | Loop over multiple arrays simultaneously | Task
Loop over multiple arrays (or lists or tuples or whatever they're called in
your language) and display the i th element of each.
Use your language's "for each" loop if it has one, otherwise iterate
through the collection in order with some other loop.
For this example, loop over the arrays:
... | #XPL0 | XPL0 | string 0; \use zero terminated strings
include c:\cxpl\codes; \intrinsic 'code' declarations
char A1, A2;
int A3, I;
[A1:= "abc";
A2:= "ABC";
A3:= [1,2,3];
for I:= 0 to 2 do
[ChOut(0, A1(I));
ChOut(0, A2(I));
IntOut(0, A3(I));
CrLf(0);
];
] | Give a code snippet in #XPL0
Task
Loop over multiple arrays (or lists or tuples or whatever they're called in
your language) and display the i th element of each.
Use your language's "for each" loop if it has one, otherwise iterate
through the collection in order with some other loop.
For this examp... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Host_introspection | Host introspection | Print the word size and endianness of the host machine.
See also: Variable size/Get
| #Go | Go | package main
import (
"fmt"
"io/ioutil"
"runtime"
"strconv"
"strings"
"unsafe"
)
func main() {
fmt.Println(runtime.Version(), runtime.GOOS, runtime.GOARCH)
// Inspect a uint32 variable to determine endianness.
x := uint32(0x01020304)
switch *(*byte)(unsafe.Pointer(&x)) {
case 0x01:
fmt.Println("big e... | Give a code snippet in #Go
Print the word size and endianness of the host machine.
See also: Variable size/Get
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Ray-casting_algorithm | Ray-casting algorithm |
This page uses content from Wikipedia. The original article was at Point_in_polygon. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
Given a point and a polygon, check if the point is inside or out... | #Smalltalk | Smalltalk | Object subclass: Segment [
|pts|
Segment class >> new: points [ |a|
a := super new.
^ a init: points
]
init: points [ pts := points copy. ^self ]
endPoints [ ^pts ]
"utility methods"
first [ ^ pts at: 1]
second [ ^ pts at: 2]
leftmostEndPoint [
^ (self first x > se... | Give a code snippet in #Smalltalk
This page uses content from Wikipedia. The original article was at Point_in_polygon. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
Given a point and a polygon, ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #Java | Java | public static boolean prime(long a){
if(a == 2){
return true;
}else if(a <= 1 || a % 2 == 0){
return false;
}
long max = (long)Math.sqrt(a);
for(long n= 3; n <= max; n+= 2){
if(a % n == 0){ return false; }
}
return true;
} | Give a code snippet in #Java
Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Averages/Simple_moving_average | Averages/Simple moving average | Computing the simple moving average of a series of numbers.
Task[edit]
Create a stateful function/class/instance that takes a period and returns a routine that takes a number as argument and returns a simple moving average of its arguments so far.
Description
A simple moving average is a method for computing an avera... | #Oz | Oz | declare
fun {CreateSMA Period}
Xs = {NewCell nil}
in
fun {$ X}
Xs := {List.take X|@Xs Period}
{FoldL @Xs Number.'+' 0.0}
/
{Int.toFloat {Min Period {Length @Xs}}}
end
end
in
for Period in [3 5] do
SMA = {CreateSMA Period}
in
{System.showInfo "\n... | Give a code snippet in #Oz
Computing the simple moving average of a series of numbers.
Task[edit]
Create a stateful function/class/instance that takes a period and returns a routine that takes a number as argument and returns a simple moving average of its arguments so far.
Description
A simple moving average is a m... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Integer_comparison | Integer comparison |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #i | i | software {
a = number(read(' '))
b = number(read())
if a < b
print(a, " is less than ", b)
end
if a = b
print(a, " is equal to ", b)
end
if a > b
print(a, " is greater than ", b)
end
} | Give a code snippet in #i
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Conc... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Real_constants_and_functions | Real constants and functions | Task
Show how to use the following math constants and functions in your language (if not available, note it):
e (base of the natural logarithm)
π
{\displaystyle \pi }
square root
logarithm (any base allowed)
exponential (ex )
absolute value (a.k.a. "magnitude")
floor (largest ... | #Pascal | Pascal | { Euler’s constant }
exp(1)
{ principal square root of `x` }
sqrt(x)
{ natural logarithm }
ln(x)
{ exponential }
exp(x)
{ absolute value }
abs(x) | Give a code snippet in #Pascal
Task
Show how to use the following math constants and functions in your language (if not available, note it):
e (base of the natural logarithm)
π
{\displaystyle \pi }
square root
logarithm (any base allowed)
exponential (ex )
absolute value (a.k.a. "... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Atomic_updates | Atomic updates |
Task
Define a data type consisting of a fixed number of 'buckets', each containing a nonnegative integer value, which supports operations to:
get the current value of any bucket
remove a specified amount from one specified bucket and add it to another, preserving the total of all bucket values, and clamping the t... | #C.2B.2B | C++ | #include <algorithm>
#include <array>
#include <chrono>
#include <iomanip>
#include <iostream>
#include <mutex>
#include <random>
#include <thread>
using namespace std;
constexpr int bucket_count = 15;
void equalizer(array<int, bucket_count>& buckets,
array<mutex, bucket_count>& bucket_mutex) {
... | Give a code snippet in #C.2B.2B
Task
Define a data type consisting of a fixed number of 'buckets', each containing a nonnegative integer value, which supports operations to:
get the current value of any bucket
remove a specified amount from one specified bucket and add it to another, preserving the total of all ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Caesar_cipher | Caesar cipher |
Task
Implement a Caesar cipher, both encoding and decoding.
The key is an integer from 1 to 25.
This cipher rotates (either towards left or right) the letters of the alphabet (A to Z).
The encoding replaces each letter with the 1st to 25th next letter in the alphabet (wrapping Z to A).
So key 2 encrypts "HI" to... | #Brainf.2A.2A.2A | Brainf*** | Author: Ettore Forigo | Hexwell
+ start the key input loop
[
memory: | c | 0 | cc | key |
^
, take one character of the key
... | Give a code snippet in #Brainf.2A.2A.2A
Task
Implement a Caesar cipher, both encoding and decoding.
The key is an integer from 1 to 25.
This cipher rotates (either towards left or right) the letters of the alphabet (A to Z).
The encoding replaces each letter with the 1st to 25th next letter in the alphabet (wra... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Semiprime | Semiprime | Semiprime numbers are natural numbers that are products of exactly two (possibly equal) prime numbers.
Semiprimes are also known as:
semi-primes
biprimes
bi-primes
2-almost primes
or simply: P2
Example
1679 = 23 × 73
(This particular number was chosen as the length of the Arecib... | #ERRE | ERRE |
PROGRAM SEMIPRIME_NUMBER
!VAR I%
PROCEDURE SEMIPRIME(N%->RESULT%)
LOCAL F%,P%
P%=2
LOOP
EXIT IF NOT(F%<2 AND P%*P%<=N%)
WHILE (N% MOD P%)=0 DO
N%=N% DIV P%
F%+=1
END WHILE
P%+=1
END LOOP
RESULT%=F%-(N%>1)=2
END PROCEDURE
BEGIN
PRINT(CHR$(1... | Give a code snippet in #ERRE
Semiprime numbers are natural numbers that are products of exactly two (possibly equal) prime numbers.
Semiprimes are also known as:
semi-primes
biprimes
bi-primes
2-almost primes
or simply: P2
Example
1679 = 23 × 73
(This particular number was chos... | christopher/rosetta-code | |
http://rosettacode.org/wiki/FizzBuzz | FizzBuzz | Task
Write a program that prints the integers from 1 to 100 (inclusive).
But:
for multiples of three, print Fizz (instead of the number)
for multiples of five, print Buzz (instead of the number)
for multiples of both three and five, print FizzBuzz (instead of the number)
... | #hexiscript | hexiscript | for let i 1; i <= 100; i++
if i % 3 = 0 && i % 5 = 0; println "FizzBuzz"
elif i % 3 = 0; println "Fizz"
elif i % 5 = 0; println "Buzz"
else println i; endif
endfor | Give a code snippet in #hexiscript
Task
Write a program that prints the integers from 1 to 100 (inclusive).
But:
for multiples of three, print Fizz (instead of the number)
for multiples of five, print Buzz (instead of the number)
for multiples of both three and five, print Fiz... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Averages/Arithmetic_mean | Averages/Arithmetic mean | Task[edit]
Write a program to find the mean (arithmetic average) of a numeric vector.
In case of a zero-length input, since the mean of an empty set of numbers is ill-defined, the program may choose to behave in any way it deems appropriate, though if the programming language has an established convention for conveyin... | #8th | 8th |
: avg \ a -- avg(a)
dup ' n:+ 0 a:reduce
swap a:len nip n:/ ;
\ test:
[ 1.0, 2.3, 1.1, 5.0, 3, 2.8, 2.01, 3.14159 ] avg . cr
[ ] avg . cr
[ 10 ] avg . cr
bye
| Give a code snippet in #8th
Task[edit]
Write a program to find the mean (arithmetic average) of a numeric vector.
In case of a zero-length input, since the mean of an empty set of numbers is ill-defined, the program may choose to behave in any way it deems appropriate, though if the programming language has an establ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Trigonometric_functions | Trigonometric functions | Task
If your language has a library or built-in functions for trigonometry, show examples of:
sine
cosine
tangent
inverses (of the above)
using the same angle in radians and degrees.
For the non-inverse functions, each radian/degree pair should use arguments that evaluate to the same angle (that i... | #C.23 | C# | using System;
namespace RosettaCode {
class Program {
static void Main(string[] args) {
Console.WriteLine("=== radians ===");
Console.WriteLine("sin (pi/3) = {0}", Math.Sin(Math.PI / 3));
Console.WriteLine("cos (pi/3) = {0}", Math.Cos(Math.PI / 3));
Console.... | Give a code snippet in #C.23
Task
If your language has a library or built-in functions for trigonometry, show examples of:
sine
cosine
tangent
inverses (of the above)
using the same angle in radians and degrees.
For the non-inverse functions, each radian/degree pair should use arguments that evalua... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Conway%27s_Game_of_Life | Conway's Game of Life | The Game of Life is a cellular automaton devised by the British mathematician John Horton Conway in 1970. It is the best-known example of a cellular automaton.
Conway's game of life is described here:
A cell C is represented by a 1 when alive, or 0 when dead, in an m-by-m (or m×m) sq... | #Rust | Rust |
use std::collections::HashMap;
use std::collections::HashSet;
type Cell = (i32, i32);
type Colony = HashSet<Cell>;
fn print_colony(col: &Colony, width: i32, height: i32) {
for y in 0..height {
for x in 0..width {
print!("{} ",
if col.contains(&(x, y)) {"O"}
... | Give a code snippet in #Rust
The Game of Life is a cellular automaton devised by the British mathematician John Horton Conway in 1970. It is the best-known example of a cellular automaton.
Conway's game of life is described here:
A cell C is represented by a 1 when alive, or 0 when dead, ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/McNuggets_problem | McNuggets problem | Wikipedia
The McNuggets version of the coin problem was introduced by Henri Picciotto,
who included it in his algebra textbook co-authored with Anita Wah. Picciotto
thought of the application in the 1980s while dining with his son at
McDonald's, working the problem out on a napkin. A McNugget number is
the total number... | #PicoLisp | PicoLisp | (de nuggets1 (M)
(let Lst (range 0 M)
(for A (range 0 M 6)
(for B (range A M 9)
(for C (range B M 20)
(set (nth Lst (inc C))) ) ) )
(apply max Lst) ) ) | Give a code snippet in #PicoLisp
Wikipedia
The McNuggets version of the coin problem was introduced by Henri Picciotto,
who included it in his algebra textbook co-authored with Anita Wah. Picciotto
thought of the application in the 1980s while dining with his son at
McDonald's, working the problem out on a napkin. A M... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Short-circuit_evaluation | Short-circuit evaluation | Control Structures
These are examples of control structures. You may also be interested in:
Conditional structures
Exceptions
Flow-control structures
Loops
Assume functions a and b return boolean values, and further, the execution of function b takes considerable resources without side effects, an... | #Elena | Elena | import system'routines;
import extensions;
Func<bool, bool> a = (bool x){ console.writeLine:"a"; ^ x };
Func<bool, bool> b = (bool x){ console.writeLine:"b"; ^ x };
const bool[] boolValues = new bool[]{ false, true };
public program()
{
boolValues.forEach:(bool i)
{
boolValues.forEach:(bool j)
... | Give a code snippet in #Elena
Control Structures
These are examples of control structures. You may also be interested in:
Conditional structures
Exceptions
Flow-control structures
Loops
Assume functions a and b return boolean values, and further, the execution of function b takes considerable res... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Search_a_list | Search a list | Task[edit]
Find the index of a string (needle) in an indexable, ordered collection of strings (haystack).
Raise an exception if the needle is missing.
If there is more than one occurrence then return the smallest index to the needle.
Extra credit
Return the largest index to a needle that has multiple occurrences in ... | #Mathematica.2FWolfram_Language | Mathematica/Wolfram Language | haystack = {"Zig","Zag","Wally","Ronald","Bush","Zig","Zag","Krusty","Charlie","Bush","Bozo"};
needle = "Zag";
first = Position[haystack,needle,1][[1,1]]
last = Position[haystack,needle,1][[-1,1]]
all = Position[haystack,needle,1][[All,1]] | Give a code snippet in #Mathematica.2FWolfram_Language
Task[edit]
Find the index of a string (needle) in an indexable, ordered collection of strings (haystack).
Raise an exception if the needle is missing.
If there is more than one occurrence then return the smallest index to the needle.
Extra credit
Return the lar... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Evaluate_binomial_coefficients | Evaluate binomial coefficients | This programming task, is to calculate ANY binomial coefficient.
However, it has to be able to output
(
5
3
)
{\displaystyle {\binom {5}{3}}}
, which is 10.
This formula is recommended:
(
n
k
)
=
n
!
(
n
−
k
)
!
k
!
=
n
(
n
−
1
)
(
n
−
2
)
…
(
n
−
k
+
1
)
k
(
k
−
1... | #Julia | Julia | @show binomial(5, 3) | Give a code snippet in #Julia
This programming task, is to calculate ANY binomial coefficient.
However, it has to be able to output
(
5
3
)
{\displaystyle {\binom {5}{3}}}
, which is 10.
This formula is recommended:
(
n
k
)
=
n
!
(
n
−
k
)
!
k
!
=
n
(
n
−
1
)
(
n
−
... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Dinesman%27s_multiple-dwelling_problem | Dinesman's multiple-dwelling problem | Task
Solve Dinesman's multiple dwelling problem but in a way that most naturally follows the problem statement given below.
Solutions are allowed (but not required) to parse and interpret the problem text, but should remain flexible and should state what changes to the problem text are allowed. Flexibility and ease of... | #PicoLisp | PicoLisp | # Problem statement
(be dwelling (@Tenants)
(permute (Baker Cooper Fletcher Miller Smith) @Tenants)
(not (topFloor Baker @Tenants))
(not (bottomFloor Cooper @Tenants))
(not (or ((topFloor Fletcher @Tenants)) ((bottomFloor Fletcher @Tenants))))
(higherFloor Miller Cooper @Tenants)
(not (adjacentFloor S... | Give a code snippet in #PicoLisp
Task
Solve Dinesman's multiple dwelling problem but in a way that most naturally follows the problem statement given below.
Solutions are allowed (but not required) to parse and interpret the problem text, but should remain flexible and should state what changes to the problem text ar... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Factors_of_an_integer | Factors of an integer |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #ZX_Spectrum_Basic | ZX Spectrum Basic | 10 INPUT "Enter a number or 0 to exit: ";n
20 IF n=0 THEN STOP
30 PRINT "Factors of ";n;": ";
40 FOR i=1 TO n
50 IF FN m(n,i)=0 THEN PRINT i;" ";
60 NEXT i
70 DEF FN m(a,b)=a-INT (a/b)*b | Give a code snippet in #ZX_Spectrum_Basic
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #Arturo | Arturo | define :point [x,y][
init: [
ensure -> is? :floating this\x
ensure -> is? :floating this\y
]
print: [
render "point (x: |this\x|, y: |this\y|)"
]
]
define :circle [center,radius][
init: [
ensure -> is? :point this\center
ensure -> is? :floating this\radius... | Give a code snippet in #Arturo
Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Search_a_list | Search a list | Task[edit]
Find the index of a string (needle) in an indexable, ordered collection of strings (haystack).
Raise an exception if the needle is missing.
If there is more than one occurrence then return the smallest index to the needle.
Extra credit
Return the largest index to a needle that has multiple occurrences in ... | #BASIC | BASIC | DATA foo, bar, baz, quux, quuux, quuuux, bazola, ztesch, foo, bar, thud, grunt
DATA foo, bar, bletch, foo, bar, fum, fred, jim, sheila, barney, flarp, zxc
DATA spqr, wombat, shme, foo, bar, baz, bongo, spam, eggs, snork, foo, bar
DATA zot, blarg, wibble, toto, titi, tata, tutu, pippo, pluto, paperino, aap
DATA noot, mi... | Give a code snippet in #BASIC
Task[edit]
Find the index of a string (needle) in an indexable, ordered collection of strings (haystack).
Raise an exception if the needle is missing.
If there is more than one occurrence then return the smallest index to the needle.
Extra credit
Return the largest index to a needle th... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Averages/Mean_time_of_day | Averages/Mean time of day | Task[edit]
A particular activity of bats occurs at these times of the day:
23:00:17, 23:40:20, 00:12:45, 00:17:19
Using the idea that there are twenty-four hours in a day,
which is analogous to there being 360 degrees in a circle,
map times of day to and from angles;
and using the ideas of Averages/Mean angle
compute ... | #Nim | Nim | import math, complex, strutils, sequtils
proc meanAngle(deg: openArray[float]): float =
var c: Complex[float]
for d in deg:
c += rect(1.0, degToRad(d))
radToDeg(phase(c / float(deg.len)))
proc meanTime(times: openArray[string]): string =
const day = 24 * 60 * 60
let
angles = times.map(proc(time: s... | Give a code snippet in #Nim
Task[edit]
A particular activity of bats occurs at these times of the day:
23:00:17, 23:40:20, 00:12:45, 00:17:19
Using the idea that there are twenty-four hours in a day,
which is analogous to there being 360 degrees in a circle,
map times of day to and from angles;
and using the ideas of... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #Ela | Ela | open integer //arbitrary sized integers
decompose_prime n = loop n 2I
where
loop c p | c < (p * p) = [c]
| c % p == 0I = p :: (loop (c / p) p)
| else = loop c (p + 1I)
decompose_prime 600851475143I | Give a code snippet in #Ela
The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the pr... | christopher/rosetta-code | |
http://rosettacode.org/wiki/SHA-1 | SHA-1 | SHA-1 or SHA1 is a one-way hash function;
it computes a 160-bit message digest.
SHA-1 often appears in security protocols; for example,
many HTTPS websites use RSA with SHA-1 to secure their connections.
BitTorrent uses SHA-1 to verify downloads.
Git and Mercurial use SHA-1 digests to identify commits.
A US government... | #PowerShell | PowerShell |
Function Calculate-SHA1( $String ){
$Enc = [system.Text.Encoding]::UTF8
$Data = $enc.GetBytes($String)
# Create a New SHA1 Crypto Provider
$Sha = New-Object System.Security.Cryptography.SHA1CryptoServiceProvider
# Now hash and display results
$Result = $sha.ComputeHash($Data)
[Syst... | Give a code snippet in #PowerShell
SHA-1 or SHA1 is a one-way hash function;
it computes a 160-bit message digest.
SHA-1 often appears in security protocols; for example,
many HTTPS websites use RSA with SHA-1 to secure their connections.
BitTorrent uses SHA-1 to verify downloads.
Git and Mercurial use SHA-1 digests t... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Flipping_bits_game | Flipping bits game | The game
Given an N×N square array of zeroes or ones in an initial configuration, and a target configuration of zeroes and ones.
The game is to transform one to the other in as few moves as possible by inverting whole numbered rows or whole lettered
columns at once (as one move).
In an inversion. any 1 ... | #AutoHotkey | AutoHotkey | size := 3 ; max 26
Gui, Add, Button, , O
Loop, %size%
{
x := chr(A_Index+64)
If x = A
Loop, %size%
Gui, Add, Button, y+4 gFlip, % A_Index
Gui, Add, Button, ym gFlip, % x
Loop, %size%
{
y := A_Index
Random, %x%%y%, 0, 1
Gui, Add, Edit, v%x%%y% ReadOnly, % %x%%y%
}
}
Gui, Add, Text, ym, Moves:`nTarget:
L... | Give a code snippet in #AutoHotkey
The game
Given an N×N square array of zeroes or ones in an initial configuration, and a target configuration of zeroes and ones.
The game is to transform one to the other in as few moves as possible by inverting whole numbered rows or whole lettered
columns at once (as on... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Loops/Do-while | Loops/Do-while | Start with a value at 0. Loop while value mod 6 is not equal to 0.
Each time through the loop, add 1 to the value then print it.
The loop must execute at least once.
Related tasks
Loop over multiple arrays simultaneously
Loops/Break
Loops/Continue
Loops/Do-while
Loops/Downward for
Loops/For
Loo... | #Maxima | Maxima | block([n: 0], do (ldisp(n: n + 1), if mod(n, 6) = 0 then return('done)))$ | Give a code snippet in #Maxima
Start with a value at 0. Loop while value mod 6 is not equal to 0.
Each time through the loop, add 1 to the value then print it.
The loop must execute at least once.
Related tasks
Loop over multiple arrays simultaneously
Loops/Break
Loops/Continue
Loops/Do-while
Loops/... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Gauss-Jordan_matrix_inversion | Gauss-Jordan matrix inversion | Task
Invert matrix A using Gauss-Jordan method.
A being an n × n matrix.
| #Lambdatalk | Lambdatalk |
{require lib_matrix}
{M.gaussJordan
{M.new [[1,2,3],
[4,5,6],
[7,8,-9]]}}
->
[[-1.722222222222222,0.7777777777777777,-0.05555555555555555],
[1.4444444444444444,-0.5555555555555556,0.1111111111111111],
[-0.05555555555555555,0.1111111111111111,-0.05555555555555555]]
| Give a code snippet in #Lambdatalk
Task
Invert matrix A using Gauss-Jordan method.
A being an n × n matrix.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Trigonometric_functions | Trigonometric functions | Task
If your language has a library or built-in functions for trigonometry, show examples of:
sine
cosine
tangent
inverses (of the above)
using the same angle in radians and degrees.
For the non-inverse functions, each radian/degree pair should use arguments that evaluate to the same angle (that i... | #Elixir | Elixir | iex(61)> deg = 45
45
iex(62)> rad = :math.pi / 4
0.7853981633974483
iex(63)> :math.sin(deg * :math.pi / 180) == :math.sin(rad)
true
iex(64)> :math.cos(deg * :math.pi / 180) == :math.cos(rad)
true
iex(65)> :math.tan(deg * :math.pi / 180) == :math.tan(rad)
true
iex(66)> temp = :math.acos(:math.cos(rad))
0.785398163397448... | Give a code snippet in #Elixir
Task
If your language has a library or built-in functions for trigonometry, show examples of:
sine
cosine
tangent
inverses (of the above)
using the same angle in radians and degrees.
For the non-inverse functions, each radian/degree pair should use arguments that eval... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort | Sorting algorithms/Insertion sort |
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O(n log2n) sorts
Shell Sort
... | #Scala | Scala | def insertSort[X](list: List[X])(implicit ord: Ordering[X]) = {
def insert(list: List[X], value: X) = list.span(x => ord.lt(x, value)) match {
case (lower, upper) => lower ::: value :: upper
}
list.foldLeft(List.empty[X])(insert)
} | Give a code snippet in #Scala
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick so... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Damm_algorithm | Damm algorithm | The Damm algorithm is a checksum algorithm which detects all single digit errors and adjacent transposition errors.
The algorithm is named after H. Michael Damm.
Task
Verify the checksum, stored as last digit of an input.
| #8086_Assembly | 8086 Assembly | cpu 8086
bits 16
section .text
org 100h
jmp demo
;;; Given a 0-terminated ASCII string containing digits in
;;; [DS:SI], see if the check digit matches. Returns with zero flag
;;; set if it matches.
damm: xor cl,cl ; Interim digit starts out at 0
mov bx,.tab ; Index for table lookup
.dgt: lodsb ; Get next stri... | Give a code snippet in #8086_Assembly
The Damm algorithm is a checksum algorithm which detects all single digit errors and adjacent transposition errors.
The algorithm is named after H. Michael Damm.
Task
Verify the checksum, stored as last digit of an input.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Repeat | Repeat | Task
Write a procedure which accepts as arguments another procedure and a positive integer.
The latter procedure is executed a number of times equal to the accepted integer.
| #XLISP | XLISP | (defun repeat (f n)
(f)
(if (> n 1)
(repeat f (- n 1)) ) )
;; an example to test it:
(repeat (lambda () (print '(hello rosetta code))) 5) | Give a code snippet in #XLISP
Task
Write a procedure which accepts as arguments another procedure and a positive integer.
The latter procedure is executed a number of times equal to the accepted integer.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Jump_anywhere | Jump anywhere | Imperative programs
conditional structures
loops
local jumps
This task is to demonstrate a local jump and a global jump and the various other types of jumps that the language supports.
For the purpose of this task, the jumps need not be used for a single purpose and you have the freedom to use these jumps for different... | #6502_Assembly | 6502 Assembly | JMP PrintChar ; jump to the label "PrintChar" where a routine to print a letter to the screen is located. | Give a code snippet in #6502_Assembly
Imperative programs
conditional structures
loops
local jumps
This task is to demonstrate a local jump and a global jump and the various other types of jumps that the language supports.
For the purpose of this task, the jumps need not be used for a single purpose and you have the f... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Literals/Floating_point | Literals/Floating point | Programming languages have different ways of expressing floating-point literals.
Task
Show how floating-point literals can be expressed in your language: decimal or other bases, exponential notation, and any other special features.
You may want to include a regular expression or BNF/ABNF/EBNF defining allowable fo... | #11l | 11l | // 64-bit floating point literals:
2.3
0.3e+34
// single precision (32-bit) floating point literals:
2.3s
0.3e+34s | Give a code snippet in #11l
Programming languages have different ways of expressing floating-point literals.
Task
Show how floating-point literals can be expressed in your language: decimal or other bases, exponential notation, and any other special features.
You may want to include a regular expression or BNF/AB... | christopher/rosetta-code | |
http://rosettacode.org/wiki/First-class_functions/Use_numbers_analogously | First-class functions/Use numbers analogously | In First-class functions, a language is showing how its manipulation of functions is similar to its manipulation of other types.
This tasks aim is to compare and contrast a language's implementation of first class functions, with its normal handling of numbers.
Write a program to create an ordered collection of a m... | #Never | Never |
func multiplier(a : float, b : float) -> (float) -> float {
let func(m : float) -> float { a * b * m }
}
func main() -> int {
var x = 2.0;
var xi = 0.5;
var y = 4.0;
var yi = 0.25;
var z = x + y;
var zi = 1.0 / z;
var f = [ x, y, z ] : float;
var i = [ xi, yi, zi ] : float;
... | Give a code snippet in #Never
In First-class functions, a language is showing how its manipulation of functions is similar to its manipulation of other types.
This tasks aim is to compare and contrast a language's implementation of first class functions, with its normal handling of numbers.
Write a program to crea... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sum_digits_of_an_integer | Sum digits of an integer | Task
Take a Natural Number in a given base and return the sum of its digits:
110 sums to 1
123410 sums to 10
fe16 sums to 29
f0e16 sums to 29
| #Cowgol | Cowgol | include "cowgol.coh";
sub digitSum(n: uint32, base: uint32): (r: uint32) is
r := 0;
while n > 0 loop
r := r + n % base;
n := n / base;
end loop;
end sub;
print_i32(digitSum(1, 10)); # prints 1
print_nl();
print_i32(digitSum(1234, 10)); # prints 10
print_nl();
print_i32(digitSum(0xFE, 16)... | Give a code snippet in #Cowgol
Task
Take a Natural Number in a given base and return the sum of its digits:
110 sums to 1
123410 sums to 10
fe16 sums to 29
f0e16 sums to 29
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Minesweeper_game | Minesweeper game | There is an n by m grid that has a random number (between 10% to 20% of the total number of tiles, though older implementations may use 20%..60% instead) of randomly placed mines that need to be found.
Positions in the grid are modified by entering their coordinates where the first coordinate is horizontal in the grid... | #VBA | VBA | In your Vbaproject, insert :
- 1 Module
- 1 Class Module (Name it cMinesweeper) | Give a code snippet in #VBA
There is an n by m grid that has a random number (between 10% to 20% of the total number of tiles, though older implementations may use 20%..60% instead) of randomly placed mines that need to be found.
Positions in the grid are modified by entering their coordinates where the first coordin... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Integer_sequence | Integer sequence | Task
Create a program that, when run, would display all integers from 1 to ∞ (or any relevant implementation limit), in sequence (i.e. 1, 2, 3, 4, etc) if given enough time.
An example may not be able to reach arbitrarily-large numbers based on implementations limits. For example, if integer... | #Raku | Raku | .say for 1..* | Give a code snippet in #Raku
Task
Create a program that, when run, would display all integers from 1 to ∞ (or any relevant implementation limit), in sequence (i.e. 1, 2, 3, 4, etc) if given enough time.
An example may not be able to reach arbitrarily-large numbers based on implementations lim... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Hello_world/Line_printer | Hello world/Line printer | Task
Cause a line printer attached to the computer to print a line containing the message: Hello World!
Note
A line printer is not the same as standard output.
A line printer was an older-style printer which prints one line at a time to a continuous ream of paper.
With some systems, a line printer can be... | #Prolog | Prolog |
:- initialization(main).
main :-
open("/dev/lp0", write, Printer),
writeln(Printer, "Hello, world!"),
flush_output(Printer),
close(Printer).
| Give a code snippet in #Prolog
Task
Cause a line printer attached to the computer to print a line containing the message: Hello World!
Note
A line printer is not the same as standard output.
A line printer was an older-style printer which prints one line at a time to a continuous ream of paper.
With som... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Increment_a_numerical_string | Increment a numerical string | Task
Increment a numerical string.
| #FreeBASIC | FreeBASIC | ' FB 1.05.0 Win64
Function Increment (num As String) As String
Dim d As Double = Val(num)
Return Str(d + 1.0)
End Function
Dim num(5) As String = {"1", "5", "81", "123.45", "777.77", "1000"}
For i As Integer = 0 To 5
Print num(i); " + 1", " = "; Increment(num(i))
Next
Print
Print "Press any key to exit"
Sle... | Give a code snippet in #FreeBASIC
Task
Increment a numerical string.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Guess_the_number/With_feedback | Guess the number/With feedback | Task
Write a game (computer program) that follows the following rules:
The computer chooses a number between given set limits.
The player is asked for repeated guesses until the the target number is guessed correctly
At each guess, the computer responds with whether the guess is:
higher than the target,
equal to... | #Action.21 | Action! | PROC Main()
BYTE x,n,min=[1],max=[100]
PrintF("Try to guess a number %B-%B: ",min,max)
x=Rand(max-min+1)+min
DO
n=InputB()
IF n<min OR n>max THEN
Print("The input is incorrect. Try again: ")
ELSEIF n<x THEN
Print("My number is higher. Try again: ")
ELSEIF n>x THEN
Print("My n... | Give a code snippet in #Action.21
Task
Write a game (computer program) that follows the following rules:
The computer chooses a number between given set limits.
The player is asked for repeated guesses until the the target number is guessed correctly
At each guess, the computer responds with whether the guess is:... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Averages/Median | Averages/Median | Task[edit]
Write a program to find the median value of a vector of floating-point numbers.
The program need not handle the case where the vector is empty, but must handle the case where there are an even number of elements. In that case, return the average of the two middle values.
There are several approaches ... | #C | C | #include <stdio.h>
#include <stdlib.h>
typedef struct floatList {
float *list;
int size;
} *FloatList;
int floatcmp( const void *a, const void *b) {
if (*(const float *)a < *(const float *)b) return -1;
else return *(const float *)a > *(const float *)b;
}
float median( FloatList fl )
{
qsort... | Give a code snippet in #C
Task[edit]
Write a program to find the median value of a vector of floating-point numbers.
The program need not handle the case where the vector is empty, but must handle the case where there are an even number of elements. In that case, return the average of the two middle values.
Th... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Verify_distribution_uniformity/Chi-squared_test | Verify distribution uniformity/Chi-squared test | Task
Write a function to verify that a given distribution of values is uniform by using the
χ
2
{\displaystyle \chi ^{2}}
test to see if the distribution has a likelihood of happening of at least the significance level (conventionally 5%).
The function should return a boolean that is true if the distribut... | #D | D | import std.stdio, std.algorithm, std.mathspecial;
real x2Dist(T)(in T[] data) pure nothrow @safe @nogc {
immutable avg = data.sum / data.length;
immutable sqs = reduce!((a, b) => a + (b - avg) ^^ 2)(0.0L, data);
return sqs / avg;
}
real x2Prob(in real dof, in real distance) pure nothrow @safe @nogc {
... | Give a code snippet in #D
Task
Write a function to verify that a given distribution of values is uniform by using the
χ
2
{\displaystyle \chi ^{2}}
test to see if the distribution has a likelihood of happening of at least the significance level (conventionally 5%).
The function should return a boolean th... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Variables | Variables | Task
Demonstrate a language's methods of:
variable declaration
initialization
assignment
datatypes
scope
referencing, and
other variable related facilities
| #Z80_Assembly | Z80 Assembly | UserRam equ &C000
ld a,&50 ;load hexadecimal 50 into A
ld (UserRam),a ;initialize UserRam with a value of &50
ld a,&40 ;load hexadecimal 40 into A
ld (UserRam),a ;assign UserRam a new value of &40 | Give a code snippet in #Z80_Assembly
Task
Demonstrate a language's methods of:
variable declaration
initialization
assignment
datatypes
scope
referencing, and
other variable related facilities
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Queue/Usage | Queue/Usage |
Data Structure
This illustrates a data structure, a means of storing data within a program.
You may see other such structures in the Data Structures category.
Illustration of FIFO behavior
Task
Create a queue data structure and demonstrate its operations.
(For implementations of queues, see the FIFO task.)
Ope... | #Bracmat | Bracmat | ( queue
= (list=)
(enqueue=.(.!arg) !(its.list):?(its.list))
( dequeue
= x
. !(its.list):?(its.list) (.?x)
& !x
)
(empty=.!(its.list):)
)
& new$queue:?Q
& ( (Q..enqueue)$1
& (Q..enqueue)$2
& (Q..enqueue)$3
& out$((Q..dequeue)$)
& (Q..enqueue)... | Give a code snippet in #Bracmat
Data Structure
This illustrates a data structure, a means of storing data within a program.
You may see other such structures in the Data Structures category.
Illustration of FIFO behavior
Task
Create a queue data structure and demonstrate its operations.
(For implementations of q... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Farey_sequence | Farey sequence | The Farey sequence Fn of order n is the sequence of completely reduced fractions between 0 and 1 which, when in lowest terms, have denominators less than or equal to n, arranged in order of increasing size.
The Farey sequence is sometimes incorrectly called a Farey series.
Each Farey se... | #BASIC256 | BASIC256 | for i = 1 to 11
print "F"; i; " = ";
call farey(i, FALSE)
next i
print
for i = 100 to 1000 step 100
print "F"; i;
if i <> 1000 then print " "; else print "";
print " = ";
call farey(i, FALSE)
next i
end
subroutine farey(n, descending)
a = 0 : b = 1 : c = 1 : d = n : k = 0
cont = 0
... | Give a code snippet in #BASIC256
The Farey sequence Fn of order n is the sequence of completely reduced fractions between 0 and 1 which, when in lowest terms, have denominators less than or equal to n, arranged in order of increasing size.
The Farey sequence is sometimes incorrectly called ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Exponentiation_with_infix_operators_in_(or_operating_on)_the_base | Exponentiation with infix operators in (or operating on) the base | (Many programming languages, especially those with extended─precision integer arithmetic, usually
support one of **, ^, ↑ or some such for exponentiation.)
Some languages treat/honor infix operators when performing exponentiation (raising
numbers to some power by the language's exponentiation operator, if ... | #Phix | Phix | for x=-5 to 5 by 10 do
for p=2 to 3 do
printf(1,"x = %2d, p = %d, power(-x,p) = %4d, -power(x,p) = %4d\n",{x,p,power(-x,p),-power(x,p)})
end for
end for
| Give a code snippet in #Phix
(Many programming languages, especially those with extended─precision integer arithmetic, usually
support one of **, ^, ↑ or some such for exponentiation.)
Some languages treat/honor infix operators when performing exponentiation (raising
numbers to some power by the language's ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Substring/Top_and_tail | Substring/Top and tail | The task is to demonstrate how to remove the first and last characters from a string.
The solution should demonstrate how to obtain the following results:
String with first character removed
String with last character removed
String with both the first and last characters removed
If the program uses UTF-8 or UTF... | #Java | Java | public class RM_chars {
public static void main( String[] args ){
System.out.println( "knight".substring( 1 ) );
System.out.println( "socks".substring( 0, 4 ) );
System.out.println( "brooms".substring( 1, 5 ) );
// first, do this by selecting a specific substring
// to exclude the first and la... | Give a code snippet in #Java
The task is to demonstrate how to remove the first and last characters from a string.
The solution should demonstrate how to obtain the following results:
String with first character removed
String with last character removed
String with both the first and last characters removed
If... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Loops/Infinite | Loops/Infinite | Task
Print out SPAM followed by a newline in an infinite loop.
Related tasks
Loop over multiple arrays simultaneously
Loops/Break
Loops/Continue
Loops/Do-while
Loops/Downward for
Loops/For
Loops/For with a specified step
Loops/Foreach
Loops/Increment loop index within l... | #Ruby | Ruby | loop {puts "SPAM"}
| Give a code snippet in #Ruby
Task
Print out SPAM followed by a newline in an infinite loop.
Related tasks
Loop over multiple arrays simultaneously
Loops/Break
Loops/Continue
Loops/Do-while
Loops/Downward for
Loops/For
Loops/For with a specified step
Loops/Foreach
Loops... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Include_a_file | Include a file | Task
Demonstrate the language's ability to include source code from other files.
See Also
Compiler/Simple file inclusion pre processor
| #Lasso | Lasso | include('myfile.lasso') | Give a code snippet in #Lasso
Task
Demonstrate the language's ability to include source code from other files.
See Also
Compiler/Simple file inclusion pre processor
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Roman_numerals/Encode | Roman numerals/Encode | Task
Create a function taking a positive integer as its parameter and returning a string containing the Roman numeral representation of that integer. Modern Roman numerals are written by expressing each digit separately, starting with the left most digit and skipping any digit with a value of zero.
In Roman numeral... | #JavaScript | JavaScript | var roman = {
map: [
1000, 'M', 900, 'CM', 500, 'D', 400, 'CD', 100, 'C', 90, 'XC',
50, 'L', 40, 'XL', 10, 'X', 9, 'IX', 5, 'V', 4, 'IV', 1, 'I',
],
int_to_roman: function(n) {
var value = '';
for (var idx = 0; n > 0 && idx < this.map.length; idx += 2) {
while (n ... | Give a code snippet in #JavaScript
Task
Create a function taking a positive integer as its parameter and returning a string containing the Roman numeral representation of that integer. Modern Roman numerals are written by expressing each digit separately, starting with the left most digit and skipping any digit with ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Minkowski_question-mark_function | Minkowski question-mark function | The Minkowski question-mark function converts the continued fraction representation [a0; a1, a2, a3, ...] of a number into a binary decimal representation in which the integer part a0 is unchanged and the a1, a2, ... become alternating runs of binary zeroes and ones of those lengths. The decimal point takes the place o... | #Haskell | Haskell | import Data.Tree
import Data.Ratio
import Data.List
intervalTree :: (a -> a -> a) -> (a, a) -> Tree a
intervalTree node = unfoldTree $
\(a, b) -> let m = node a b in (m, [(a,m), (m,b)])
Node a _ ==> Node b [] = const b
Node a [] ==> Node b _ = const b
Node a [l1, r1] ==> Node b [l2, r2] =
\x -> case x `compare`... | Give a code snippet in #Haskell
The Minkowski question-mark function converts the continued fraction representation [a0; a1, a2, a3, ...] of a number into a binary decimal representation in which the integer part a0 is unchanged and the a1, a2, ... become alternating runs of binary zeroes and ones of those lengths. Th... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Hello_world/Text | Hello world/Text | Hello world/Text is part of Short Circuit's Console Program Basics selection.
Task
Display the string Hello world! on a text console.
Related tasks
Hello world/Graphical
Hello world/Line Printer
Hello world/Newbie
Hello world/Newline omission
Hello world/Standard error
Hello world/Web server
| #Dylan | Dylan |
module: hello-world
format-out("%s\n", "Hello world!");
| Give a code snippet in #Dylan
Hello world/Text is part of Short Circuit's Console Program Basics selection.
Task
Display the string Hello world! on a text console.
Related tasks
Hello world/Graphical
Hello world/Line Printer
Hello world/Newbie
Hello world/Newline omission
Hello world/Standard error
... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Ethiopian_multiplication | Ethiopian multiplication | Ethiopian multiplication is a method of multiplying integers using only addition, doubling, and halving.
Method:
Take two numbers to be multiplied and write them down at the top of two columns.
In the left-hand column repeatedly halve the last number, discarding any remainders, and write the result below the last ... | #Smalltalk | Smalltalk | Number extend [
double [ ^ self * 2 ]
halve [ ^ self // 2 ]
ethiopianMultiplyBy: aNumber withTutor: tutor [
|result multiplier multiplicand|
multiplier := self.
multiplicand := aNumber.
tutor ifTrue: [ ('ethiopian multiplication of %1 and %2' %
{ multiplier. multiplicand })... | Give a code snippet in #Smalltalk
Ethiopian multiplication is a method of multiplying integers using only addition, doubling, and halving.
Method:
Take two numbers to be multiplied and write them down at the top of two columns.
In the left-hand column repeatedly halve the last number, discarding any remainders, a... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Window_creation/X11 | Window creation/X11 | Task
Create a simple X11 application, using an X11 protocol library such as Xlib or XCB, that draws a box and "Hello World" in a window.
Implementations of this task should avoid using a toolkit as much as possible.
| #Forth | Forth |
warnings off
require xlib.fs
0 value X11-D \ Display
0 value X11-S \ Screen
0 value X11-root
0 value X11-GC
0 value X11-W \ Window
0 value X11-Black
0 value X11-White
9 value X11-Top
0 value X11-Left
create X11-ev 96 allot
variable wm_delete
: X... | Give a code snippet in #Forth
Task
Create a simple X11 application, using an X11 protocol library such as Xlib or XCB, that draws a box and "Hello World" in a window.
Implementations of this task should avoid using a toolkit as much as possible.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Ordered_words | Ordered words | An ordered word is a word in which the letters appear in alphabetic order.
Examples include abbey and dirt.
Task[edit]
Find and display all the ordered words in the dictionary unixdict.txt that have the longest word length.
(Examples that access the dictionary file locally assume that you have download... | #E | E | pragma.enable("accumulator")
def words := <http://www.puzzlers.org/pub/wordlists/unixdict.txt>.getText().split("\n")
def ordered := accum [] for word ? (word.sort() <=> word) in words { _.with(word) }
def maxLen := accum 0 for word in ordered { _.max(word.size()) }
def maxOrderedWords := accum [] for word ? (word.siz... | Give a code snippet in #E
An ordered word is a word in which the letters appear in alphabetic order.
Examples include abbey and dirt.
Task[edit]
Find and display all the ordered words in the dictionary unixdict.txt that have the longest word length.
(Examples that access the dictionary file locally as... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Bernoulli_numbers | Bernoulli numbers | Bernoulli numbers are used in some series expansions of several functions (trigonometric, hyperbolic, gamma, etc.), and are extremely important in number theory and analysis.
Note that there are two definitions of Bernoulli numbers; this task will be using the modern usage (as per The National Institute of S... | #Crystal | Crystal | require "big"
class Bernoulli
include Iterator(Tuple(Int32, BigRational))
def initialize
@a = [] of BigRational
@m = 0
end
def next
@a << BigRational.new(1, @m+1)
@m.downto(1) { |j| @a[j-1] = j*(@a[j-1] - @a[j]) }
v = @m.odd? && @m != 1 ? BigRational.new(0, 1) : @a.first
return {@m... | Give a code snippet in #Crystal
Bernoulli numbers are used in some series expansions of several functions (trigonometric, hyperbolic, gamma, etc.), and are extremely important in number theory and analysis.
Note that there are two definitions of Bernoulli numbers; this task will be using the modern usage (as ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #C.2B.2B | C++ | #include <iostream>
using namespace std;
int main(int argc, char **argv) {
char *program = argv[0];
cout << "Program: " << program << endl;
} | Give a code snippet in #C.2B.2B
The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the scrip... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Reverse_a_string | Reverse a string | Task
Take a string and reverse it.
For example, "asdf" becomes "fdsa".
Extra credit
Preserve Unicode combining characters.
For example, "as⃝df̅" becomes "f̅ds⃝a", not "̅fd⃝sa".
Other tasks related to string operations:
Metrics
Array length
String length
Copy a string
Empty string (assignment)
Counting
... | #Liberty_BASIC | Liberty BASIC | input$ ="abcdefgABCDEFG012345"
print input$
print ReversedStr$( input$)
end
function ReversedStr$(in$)
for i =len(in$) to 1 step -1
ReversedStr$ =ReversedStr$ +mid$( in$, i, 1)
next i
end function | Give a code snippet in #Liberty_BASIC
Task
Take a string and reverse it.
For example, "asdf" becomes "fdsa".
Extra credit
Preserve Unicode combining characters.
For example, "as⃝df̅" becomes "f̅ds⃝a", not "̅fd⃝sa".
Other tasks related to string operations:
Metrics
Array length
String length
Copy a strin... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort | Sorting algorithms/Insertion sort |
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O(n log2n) sorts
Shell Sort
... | #TI-83_BASIC | TI-83 BASIC | :"INSERTION"
:L1→L2
:0→A
:Lbl L
:A+1→A
:A→B
:While B>0
:If L2(B)≤L2(B+1)
:Goto B
:L2(B)→C
:L2(B+1)→L2(B)
:C→L2(B+1)
:B-1→B
:End
:Lbl B
:If A<(dim(L2)-1)
:Goto L
:DelVar A
:DelVar B
:DelVar C
:Return
| Give a code snippet in #TI-83_BASIC
Sorting Algorithm
This is a sorting algorithm. It may be applied to a set of data in order to sort it.
For comparing various sorts, see compare sorts.
For other sorting algorithms, see sorting algorithms, or:
O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Qu... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Permutations | Permutations | Task
Write a program that generates all permutations of n different objects. (Practically numerals!)
Related tasks
Find the missing permutation
Permutations/Derangements
The number of samples of size k from n objects.
With combinations and permutations generation tasks.
Order Uni... | #zkl | zkl | zkl: Utils.Helpers.permute("rose").apply("concat")
L("rose","roes","reos","eros","erso","reso","rseo","rsoe","sroe","sreo",...)
zkl: Utils.Helpers.permute("rose").len()
24
zkl: Utils.Helpers.permute(T(1,2,3,4))
L(L(1,2,3,4),L(1,2,4,3),L(1,4,2,3),L(4,1,2,3),L(4,1,3,2),L(1,4,3,2),L(1,3,4,2),L(1,3,2,4),...) | Give a code snippet in #zkl
Task
Write a program that generates all permutations of n different objects. (Practically numerals!)
Related tasks
Find the missing permutation
Permutations/Derangements
The number of samples of size k from n objects.
With combinations and permutations genera... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Vigen%C3%A8re_cipher/Cryptanalysis | Vigenère cipher/Cryptanalysis | Given some text you suspect has been encrypted with a Vigenère cipher, extract the key and plaintext. There are several methods for doing this. See the Wikipedia entry for more information. Use the following encrypted text:
MOMUD EKAPV TQEFM OEVHP AJMII CDCTI FGYAG JSPXY ALUYM NSMYH
VUXJE LEPXJ FXGCM JHKDZ RYICU HYPUS... | #Nim | Nim | import sequtils, strutils, sugar, tables, times
const
CipherText = """MOMUD EKAPV TQEFM OEVHP AJMII CDCTI FGYAG JSPXY ALUYM NSMYH
VUXJE LEPXJ FXGCM JHKDZ RYICU HYPUS PGIGM OIYHF WHTCQ KMLRD
ITLXZ LJFVQ GHOLW CUHLO MDSOE KTALU VYLNZ RFGBX PHVGA LWQIS
FGRPH JOOF... | Give a code snippet in #Nim
Given some text you suspect has been encrypted with a Vigenère cipher, extract the key and plaintext. There are several methods for doing this. See the Wikipedia entry for more information. Use the following encrypted text:
MOMUD EKAPV TQEFM OEVHP AJMII CDCTI FGYAG JSPXY ALUYM NSMYH
VUXJE ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Maximum_triangle_path_sum | Maximum triangle path sum | Starting from the top of a pyramid of numbers like this, you can walk down going one step on the right or on the left, until you reach the bottom row:
55
94 48
95 30 96
77 71 26 67
One of such walks is 55 - 94 - 30 - 26.
You... | #jq | jq | # Usage: TRIANGLE | solve
def solve:
# update(next) updates the input row of maxima:
def update(next):
. as $maxima
| [ range(0; next|length)
| next[.] + ([$maxima[.], $maxima[. + 1]] | max) ];
. as $in
| reduce range(length -2; -1; -1) as $i
($in[-1]; update( $in[$i] ) ) ; | Give a code snippet in #jq
Starting from the top of a pyramid of numbers like this, you can walk down going one step on the right or on the left, until you reach the bottom row:
55
94 48
95 30 96
77 71 26 67
One of such wal... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Harshad_or_Niven_series | Harshad or Niven series | The Harshad or Niven numbers are positive integers ≥ 1 that are divisible by the sum of their digits.
For example, 42 is a Harshad number as 42 is divisible by (4 + 2) without remainder.
Assume that the series is defined as the numbers in increasing order.
Task
The task is to create a function/method/... | #Arturo | Arturo | harshad?: function [n] -> zero? n % sum digits n
harshads: select 1..1100 => harshad?
print ["First 20 harshad numbers:" first.n:20 harshads]
loop harshads 'h [
if h > 1000 [
print ["First harshad > 1000:" h]
break
]
] | Give a code snippet in #Arturo
The Harshad or Niven numbers are positive integers ≥ 1 that are divisible by the sum of their digits.
For example, 42 is a Harshad number as 42 is divisible by (4 + 2) without remainder.
Assume that the series is defined as the numbers in increasing order.
Task
The task... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Tokenize_a_string | Tokenize a string | Separate the string "Hello,How,Are,You,Today" by commas into an array (or list) so that each element of it stores a different word.
Display the words to the 'user', in the simplest manner possible, separated by a period.
To simplify, you may display a trailing period.
Other tasks related to string operations:
Me... | #Frink | Frink |
println[join[".", split[",", "Hello,How,Are,You,Today"]]]
| Give a code snippet in #Frink
Separate the string "Hello,How,Are,You,Today" by commas into an array (or list) so that each element of it stores a different word.
Display the words to the 'user', in the simplest manner possible, separated by a period.
To simplify, you may display a trailing period.
Other tasks re... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Write_entire_file | Write entire file | Task
(Over)write a file so that it contains a string.
The reverse of Read entire file—for when you want to update or create a file which you would read in its entirety all at once.
| #Elena | Elena | import system'io;
public program()
{
File.assign("filename.txt").saveContent("This file contains a string.")
} | Give a code snippet in #Elena
Task
(Over)write a file so that it contains a string.
The reverse of Read entire file—for when you want to update or create a file which you would read in its entirety all at once.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/HTTP | HTTP | Task
Access and print a URL's content (the located resource) to the console.
There is a separate task for HTTPS Requests.
| #Rust | Rust |
[dependencies]
hyper = "0.6"
| Give a code snippet in #Rust
Task
Access and print a URL's content (the located resource) to the console.
There is a separate task for HTTPS Requests.
| christopher/rosetta-code | |
http://rosettacode.org/wiki/Loops/Break | Loops/Break | Task
Show a loop which prints random numbers (each number newly generated each loop) from 0 to 19 (inclusive).
If a number is 10, stop the loop after printing it, and do not generate any further numbers.
Otherwise, generate and print a second random number before restarting the loop.
If the number 10 is never gener... | #Ela | Ela | open datetime random monad io
loop = loop' 1
where loop' n t = do
dt <- datetime.now
seed <- return <| toInt <| (ticks <| dt) * n
r <- return $ rnd seed 0 19
putStrLn (show r)
if r <> t then loop' (n + 1) t else return ()
loop ... | Give a code snippet in #Ela
Task
Show a loop which prints random numbers (each number newly generated each loop) from 0 to 19 (inclusive).
If a number is 10, stop the loop after printing it, and do not generate any further numbers.
Otherwise, generate and print a second random number before restarting the loop.
If... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Exceptions/Catch_an_exception_thrown_in_a_nested_call | Exceptions/Catch an exception thrown in a nested call | Show how to create a user-defined exception and show how to catch an exception raised from several nested calls away.
Create two user-defined exceptions, U0 and U1.
Have function foo call function bar twice.
Have function bar call function baz.
Arrange for function baz to rais... | #J | J | main=: monad define
smoutput 'main'
try. foo ''
catcht. smoutput 'main caught ',type_jthrow_
end.
)
foo=: monad define
smoutput ' foo'
for_i. 0 1 do.
try. bar i
catcht. if. type_jthrow_-:'U0' do. smoutput ' foo caught ',type_jthrow_ else. throw. end.
end.
end.
)
bar=: baz [ smoutput bin... | Give a code snippet in #J
Show how to create a user-defined exception and show how to catch an exception raised from several nested calls away.
Create two user-defined exceptions, U0 and U1.
Have function foo call function bar twice.
Have function bar call function baz.
Arrange f... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Longest_increasing_subsequence | Longest increasing subsequence | Calculate and show here a longest increasing subsequence of the list:
{
3
,
2
,
6
,
4
,
5
,
1
}
{\displaystyle \{3,2,6,4,5,1\}}
And of the list:
{
0
,
8
,
4
,
12
,
2
,
10
,
6
,
14
,
1
,
9
,
5
,
13
,
3
,
11
,
7
,
15
}
{\displaystyle \{0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15\}}
Note that a list may have m... | #Common_Lisp | Common Lisp | (defun longest-increasing-subseq (list)
(let ((subseqs nil))
(dolist (item list)
(let ((longest-so-far (longest-list-in-lists (remove-if-not #'(lambda (l) (> item (car l))) subseqs))))
(push (cons item longest-so-far) subseqs)))
(reverse (longest-list-in-lists subseqs))))
(defun longest-list-in-lists... | Give a code snippet in #Common_Lisp
Calculate and show here a longest increasing subsequence of the list:
{
3
,
2
,
6
,
4
,
5
,
1
}
{\displaystyle \{3,2,6,4,5,1\}}
And of the list:
{
0
,
8
,
4
,
12
,
2
,
10
,
6
,
14
,
1
,
9
,
5
,
13
,
3
,
11
,
7
,
15
}
{\displaystyle \{0,8,4,12,2,10,6,14,1,9,5,13,3,11,... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Literals/Integer | Literals/Integer | Some programming languages have ways of expressing integer literals in bases other than the normal base ten.
Task
Show how integer literals can be expressed in as many bases as your language allows.
Note: this should not involve the calling of any functions/methods, but should be interpreted by the compiler or... | #Phix | Phix | ?{65,#41,'A',scanf("55","%d"),0o10,0(7)11}
| Give a code snippet in #Phix
Some programming languages have ways of expressing integer literals in bases other than the normal base ten.
Task
Show how integer literals can be expressed in as many bases as your language allows.
Note: this should not involve the calling of any functions/methods, but should be ... | christopher/rosetta-code | |
http://rosettacode.org/wiki/100_doors | 100 doors | There are 100 doors in a row that are all initially closed.
You make 100 passes by the doors.
The first time through, visit every door and toggle the door (if the door is closed, open it; if it is open, close it).
The second time, only visit every 2nd door (door #2, #4, #6, ...), and toggle it.
The third... | #Glee | Glee | 100` *=0=>d $$ create vector 1..100, create bit pattern d, marking all equal to 0
:for (1..100[.s]){ $$ loop s from 1 to 100
d^(100` %s *=0 )=>d;} $$ d = d xor (bit pattern of vector 1..100 % s)
d $$ output d
| Give a code snippet in #Glee
There are 100 doors in a row that are all initially closed.
You make 100 passes by the doors.
The first time through, visit every door and toggle the door (if the door is closed, open it; if it is open, close it).
The second time, only visit every 2nd door (door #2, #4, #6, ...... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Catalan_numbers/Pascal%27s_triangle | Catalan numbers/Pascal's triangle | Task
Print out the first 15 Catalan numbers by extracting them from Pascal's triangle.
See
Catalan Numbers and the Pascal Triangle. This method enables calculation of Catalan Numbers using only addition and subtraction.
Catalan's Triangle for a Number Triangle that generates Catalan Numbers using onl... | #ALGOL_68 | ALGOL 68 | INT n = 15;
[ 0 : n + 1 ]INT t;
t[0] := 0;
t[1] := 1;
FOR i TO n DO
FOR j FROM i BY -1 TO 2 DO t[j] := t[j] + t[j-1] OD;
t[i+1] := t[i];
FOR j FROM i+1 BY -1 TO 2 DO t[j] := t[j] + t[j-1] OD;
print( ( whole( t[i+1] - t[i], 0 ), " " ) )
OD | Give a code snippet in #ALGOL_68
Task
Print out the first 15 Catalan numbers by extracting them from Pascal's triangle.
See
Catalan Numbers and the Pascal Triangle. This method enables calculation of Catalan Numbers using only addition and subtraction.
Catalan's Triangle for a Number Triangle that g... | christopher/rosetta-code | |
http://rosettacode.org/wiki/Bitmap | Bitmap | Show a basic storage type to handle a simple RGB raster graphics image,
and some primitive associated functions.
If possible provide a function to allocate an uninitialised image,
given its width and height, and provide 3 additional functions:
one to fill an image with a plain RGB color,
one to set a given pixe... | #FreeBASIC | FreeBASIC | Screenres 320, 240, 8
Dim Shared As Integer w, h
Screeninfo w, h
Const As Ubyte cyan = 3
Const As Ubyte red = 4
Sub rellenar(c As Integer)
Line (0,0) - (w/3, h/3), red, BF
End Sub
Sub establecePixel(x As Integer, y As Integer, c As Integer)
Pset (x,y), cyan
End Sub
rellenar(12)
establecePixel(10,10... | Give a code snippet in #FreeBASIC
Show a basic storage type to handle a simple RGB raster graphics image,
and some primitive associated functions.
If possible provide a function to allocate an uninitialised image,
given its width and height, and provide 3 additional functions:
one to fill an image with a plain RG... | christopher/rosetta-code |
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