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 |
|---|---|---|---|---|---|
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Julia | Julia | print("Insert the variable name: ")
variable = Symbol(readline(STDIN))
expression = quote
$variable = 42
println("Inside quote:")
@show $variable
end
eval(expression)
println("Outside quote:")
@show variable
println("If I named the variable x:")
@show x |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #Forth | Forth | \ Bindings to SDL2 functions
s" SDL2" add-lib
\c #include <SDL2/SDL.h>
c-function sdl-init SDL_Init n -- n
c-function sdl-quit SDL_Quit -- void
c-function sdl-createwindow SDL_CreateWindow a n n n n n -- a
c-function sdl-createrenderer SDL_CreateRenderer a n n -- a
c-function sdl-setdrawcolor SDL_SetRenderDrawColor... |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #FreeBASIC | FreeBASIC | ' version 27-06-2018
' compile with: fbc -s console
' or: fbc -s gui
Screen 13 ' Screen 18: 320x200, 8bit colordepth
'ScreenRes 320, 200, 24 ' Screenres: 320x200, 24bit colordepth
If ScreenPtr = 0 Then
Print "Error setting video mode!"
End
End If
Dim As UInteger depth, x = 1... |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #JavaScript | JavaScript | (() => {
'use strict';
// EGYPTIAN DIVISION --------------------------------
// eqyptianQuotRem :: Int -> Int -> (Int, Int)
const eqyptianQuotRem = (m, n) => {
const expansion = ([i, x]) =>
x > m ? (
Nothing()
) : Just([
[i, x],
... |
http://rosettacode.org/wiki/Egyptian_fractions | Egyptian fractions | An Egyptian fraction is the sum of distinct unit fractions such as:
1
2
+
1
3
+
1
16
(
=
43
48
)
{\displaystyle {\tfrac {1}{2}}+{\tfrac {1}{3}}+{\tfrac {1}{16}}\,(={\tfrac {43}{48}})}
Each fraction in the expression has a numerator equal to 1 (unity) and a denominator that... | #Mathematica.2FWolfram_Language | Mathematica/Wolfram Language | frac[n_] /; IntegerQ[1/n] := frac[n] = {n};
frac[n_] :=
frac[n] =
With[{p = Numerator[n], q = Denominator[n]},
Prepend[frac[Mod[-q, p]/(q Ceiling[1/n])], 1/Ceiling[1/n]]];
disp[f_] :=
StringRiffle[
SequenceCases[f,
l : {_, 1 ...} :>
If[Length[l] == 1 && l[[1]] < 1, ToString[l[[1]], Input... |
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 ... | #Sidef | Sidef | func double (n) { n << 1 }
func halve (n) { n >> 1 }
func isEven (n) { n&1 == 0 }
func ethiopian_mult(a, b) {
var r = 0
while (a > 0) {
r += b if !isEven(a)
a = halve(a)
b = double(b)
}
return r
}
say ethiopian_mult(17, 34) |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #PicoLisp | PicoLisp | (de dictionary (N)
(extract
'((A B)
(and
(= "1" B)
(mapcar
'((L) (if (= "1" L) "#" "."))
A ) ) )
(mapcar
'((N) (chop (pad 3 (bin N))))
(range 7 0) )
(chop (pad 8 (bin N))) ) )
(de cellular (Lst N)
(let (Lst (chop Ls... |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #Prolog | Prolog | play :- initial(I), do_auto(50, I).
initial([0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0]).
do_auto(0, _) :- !.
do_auto(N, I) :-
maplist(writ, I), nl,
apply_rules(I, Next),
succ(N1, N),
do_auto(N1, Next).
r(0,0,0,0).
r(0,0,1,1).
r(0,1,0,0).
r(0,1,1,1).
r(1,0,0,1).
r(1,0,1,0).
r(1,1,0,1).
r(1,1,1,0).
apply... |
http://rosettacode.org/wiki/Factorial | Factorial | Definitions
The factorial of 0 (zero) is defined as being 1 (unity).
The Factorial Function of a positive integer, n, is defined as the product of the sequence:
n, n-1, n-2, ... 1
Task
Write a function to return the factorial of a number.
Solutions can be iterat... | #VHDL | VHDL | LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
ENTITY Factorial IS
GENERIC (
Nbin : INTEGER := 3 ; -- number of bit to input number
Nbou : INTEGER := 13) ; -- number of bit to output factorial
PORT (
clk : IN STD_LOGIC ; -- clock of circuit
sr : IN STD_LOGIC_VECTOR(1 DOWNTO 0); -... |
http://rosettacode.org/wiki/Echo_server | Echo server | Create a network service that sits on TCP port 12321, which accepts connections on that port, and which echoes complete lines (using a carriage-return/line-feed sequence as line separator) back to clients. No error handling is required. For the purposes of testing, it is only necessary to support connections from local... | #Oz | Oz | declare
ServerSocket = {New Open.socket init}
proc {Echo Socket}
case {Socket getS($)} of false then skip
[] Line then
{System.showInfo "Received line: "#Line}
{Socket write(vs:Line#"\n")}
{Echo Socket}
end
end
class TextSocket from Open.socket Open.text end
in
{Serv... |
http://rosettacode.org/wiki/Empty_program | Empty program | Task
Create the simplest possible program that is still considered "correct."
| #Zoea | Zoea |
program: empty
|
http://rosettacode.org/wiki/Empty_program | Empty program | Task
Create the simplest possible program that is still considered "correct."
| #Zoea_Visual | Zoea Visual | |
http://rosettacode.org/wiki/Empty_program | Empty program | Task
Create the simplest possible program that is still considered "correct."
| #Zoomscript | Zoomscript | |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #Java | Java | import java.util.List;
public class Main {
private static class Range {
int start;
int end;
boolean print;
public Range(int s, int e, boolean p) {
start = s;
end = e;
print = p;
}
}
public static void main(String[] args) {
... |
http://rosettacode.org/wiki/Draw_a_rotating_cube | Draw a rotating cube | Task
Draw a rotating cube.
It should be oriented with one vertex pointing straight up, and its opposite vertex on the main diagonal (the one farthest away) straight down. It can be solid or wire-frame, and you can use ASCII art if your language doesn't have graphical capabilities. Perspective is optional.
Related ... | #Delphi | Delphi |
unit main;
interface
uses
Winapi.Windows, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.ExtCtrls,
System.Math, System.Classes;
type
TForm1 = class(TForm)
tmr1: TTimer;
procedure FormCreate(Sender: TObject);
procedure tmr1Timer(Sender: TObject);
private
{ Private declarations }
public
... |
http://rosettacode.org/wiki/Element-wise_operations | Element-wise operations | This task is similar to:
Matrix multiplication
Matrix transposition
Task
Implement basic element-wise matrix-matrix and scalar-matrix operations, which can be referred to in other, higher-order tasks.
Implement:
addition
subtraction
multiplication
division
exponentiation
Extend the task if ... | #Julia | Julia | @show [1 2 3; 3 2 1] .+ [2 1 2; 0 2 1]
@show [1 2 3; 2 1 2] .+ 1
@show [1 2 3; 2 2 1] .- [1 1 1; 2 1 0]
@show [1 2 1; 1 2 3] .* [3 2 1; 1 0 1]
@show [1 2 3; 3 2 1] .* 2
@show [9 8 6; 3 2 3] ./ [3 1 2; 2 1 2]
@show [3 2 2; 1 2 3] .^ [1 2 3; 2 1 2] |
http://rosettacode.org/wiki/Draw_a_sphere | Draw a sphere | Task
Draw a sphere.
The sphere can be represented graphically, or in ASCII art, depending on the language capabilities.
Either static or rotational projection is acceptable for this task.
Related tasks
draw a cuboid
draw a rotating cube
write language name in 3D ASCII
draw a Deathstar
| #11l | 11l | V shades = [‘.’, ‘:’, ‘!’, ‘*’, ‘o’, ‘e’, ‘&’, ‘#’, ‘%’, ‘@’]
F dotp(v1, v2)
V d = dot(v1, v2)
R I d < 0 {-d} E 0.0
F draw_sphere(r, k, ambient, light)
L(i) Int(floor(-r)) .< Int(ceil(r) + 1)
V x = i + 0.5
V line = ‘’
L(j) Int(floor(-2 * r)) .< Int(ceil(2 * r) + 1)
V y = j / 2 ... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #Action.21 | Action! | SET EndProg=* |
http://rosettacode.org/wiki/Dutch_national_flag_problem | Dutch national flag problem |
The Dutch national flag is composed of three coloured bands in the order:
red (top)
then white, and
lastly blue (at the bottom).
The problem posed by Edsger Dijkstra is:
Given a number of red, blue and white balls in random order, arrange them in the order of the colours in the Dutch national fla... | #AppleScript | AppleScript | use AppleScript version "2.3.1" -- OS X 10.9 (Mavericks) or later — for these 'use' commands!
-- This script uses a customisable AppleScript sort available at <https://macscripter.net/viewtopic.php?pid=194430#p194430>.
-- It's assumed that scripters will know how and where to install it as a library.
use sorter : scrip... |
http://rosettacode.org/wiki/Draw_a_cuboid | Draw a cuboid | Task
Draw a cuboid with relative dimensions of 2 × 3 × 4.
The cuboid can be represented graphically, or in ASCII art, depending on the language capabilities.
To fulfill the criteria of being a cuboid, three faces must be visible.
Either static or rotational projection is acceptable for this task.
R... | #Action.21 | Action! | PROC DrawCuboid(CARD x,y BYTE w,h,d)
BYTE wsize=[10],hsize=[10],dsize=[5]
BYTE i
FOR i=0 TO w
DO
Plot(x+i*wsize,y+h*hsize)
DrawTo(x+i*wsize,y)
DrawTo(x+i*wsize+d*dsize,y-d*dsize)
OD
FOR i=0 TO h
DO
Plot(x,y+i*hsize)
DrawTo(x+w*wsize,y+i*hsize)
DrawTo(x+w*wsize+d*dsize,y+i*hsize-d... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Kotlin | Kotlin | // version 1.1.4
fun main(args: Array<String>) {
var n: Int
do {
print("How many integer variables do you want to create (max 5) : ")
n = readLine()!!.toInt()
}
while (n < 1 || n > 5)
val map = mutableMapOf<String, Int>()
var name: String
var value: Int
var i = 1
... |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #GB_BASIC | GB BASIC | 10 color 1
20 point 100,100 |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #GML | GML | draw_point(100, 100); |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Julia | Julia | function egyptiandivision(dividend::Int, divisor::Int)
N = 64
powers = Vector{Int}(N)
doublings = Vector{Int}(N)
ind = 0
for i in 0:N-1
powers[i+1] = 1 << i
doublings[i+1] = divisor << i
if doublings[i+1] > dividend ind = i-1; break end
end
ans = acc = ... |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Kotlin | Kotlin | // version 1.1.4
data class DivMod(val quotient: Int, val remainder: Int)
fun egyptianDivide(dividend: Int, divisor: Int): DivMod {
require (dividend >= 0 && divisor > 0)
if (dividend < divisor) return DivMod(0, dividend)
val powersOfTwo = mutableListOf(1)
val doublings = mutableListOf(divisor)
... |
http://rosettacode.org/wiki/Egyptian_fractions | Egyptian fractions | An Egyptian fraction is the sum of distinct unit fractions such as:
1
2
+
1
3
+
1
16
(
=
43
48
)
{\displaystyle {\tfrac {1}{2}}+{\tfrac {1}{3}}+{\tfrac {1}{16}}\,(={\tfrac {43}{48}})}
Each fraction in the expression has a numerator equal to 1 (unity) and a denominator that... | #Microsoft_Small_Basic | Microsoft Small Basic | 'Egyptian fractions - 26/07/2018
xx=2014
yy=59
x=xx
y=yy
If x>=y Then
q=Math.Floor(x/y)
tt="+("+q+")"
x=Math.Remainder(x,y)
EndIf
If x<>0 Then
While x<>1
'i=modulo(-y,x)
u=-y
v=x
modulo()
i=ret
k=Math.Ceiling(y/x)
m=m+1
tt=tt+"+1/"+k
j=... |
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 })... |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #Python | Python | def eca(cells, rule):
lencells = len(cells)
c = "0" + cells + "0" # Zero pad the ends
rulebits = '{0:08b}'.format(rule)
neighbours2next = {'{0:03b}'.format(n):rulebits[::-1][n] for n in range(8)}
yield c[1:-1]
while True:
c = ''.join(['0',
''.join(neighbours2next[... |
http://rosettacode.org/wiki/Factorial | Factorial | Definitions
The factorial of 0 (zero) is defined as being 1 (unity).
The Factorial Function of a positive integer, n, is defined as the product of the sequence:
n, n-1, n-2, ... 1
Task
Write a function to return the factorial of a number.
Solutions can be iterat... | #Vim_Script | Vim Script | function! Factorial(n)
if a:n < 2
return 1
else
return a:n * Factorial(a:n-1)
endif
endfunction |
http://rosettacode.org/wiki/Echo_server | Echo server | Create a network service that sits on TCP port 12321, which accepts connections on that port, and which echoes complete lines (using a carriage-return/line-feed sequence as line separator) back to clients. No error handling is required. For the purposes of testing, it is only necessary to support connections from local... | #Perl | Perl | use IO::Socket;
my $use_fork = 1;
my $sock = new IO::Socket::INET (
LocalHost => '127.0.0.1',
LocalPort => '12321',
Proto => 'tcp',
Listen => 1, # maximum queued connections
... |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #jq | jq | # quotient and remainder
def quotient($a; $b; f; g): f = (($a/$b)|floor) | g = $a % $b;
def tasks:
[2, 1000, true],
[1000, 4000, true],
(1e4, 1e5, 1e6, 1e7, 1e8 | [2, ., false]) ;
def task:
def update(f): if (f >= 30 and f <= 66) then f %= 10 else . end;
tasks as $rg
| if $rg[0] == 2
then "e... |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #Julia | Julia |
function iseban(n::Integer)
b, r = divrem(n, oftype(n, 10 ^ 9))
m, r = divrem(r, oftype(n, 10 ^ 6))
t, r = divrem(r, oftype(n, 10 ^ 3))
m, t, r = (30 <= x <= 66 ? x % 10 : x for x in (m, t, r))
return all(in((0, 2, 4, 6)), (b, m, t, r))
end
println("eban numbers up to and including 1000:")
print... |
http://rosettacode.org/wiki/Draw_a_rotating_cube | Draw a rotating cube | Task
Draw a rotating cube.
It should be oriented with one vertex pointing straight up, and its opposite vertex on the main diagonal (the one farthest away) straight down. It can be solid or wire-frame, and you can use ASCII art if your language doesn't have graphical capabilities. Perspective is optional.
Related ... | #EasyLang | EasyLang | node[][] = [ [ -1 -1 -1 ] [ -1 -1 1 ] [ -1 1 -1 ] [ -1 1 1 ] [ 1 -1 -1 ] [ 1 -1 1 ] [ 1 1 -1 ] [ 1 1 1 ] ]
edge[][] = [ [ 0 1 ] [ 1 3 ] [ 3 2 ] [ 2 0 ] [ 4 5 ] [ 5 7 ] [ 7 6 ] [ 6 4 ] [ 0 4 ] [ 1 5 ] [ 2 6 ] [ 3 7 ] ]
#
func scale f . .
for i range len node[][]
for d range 3
node[i][d] *= f
.
.
.
fun... |
http://rosettacode.org/wiki/Element-wise_operations | Element-wise operations | This task is similar to:
Matrix multiplication
Matrix transposition
Task
Implement basic element-wise matrix-matrix and scalar-matrix operations, which can be referred to in other, higher-order tasks.
Implement:
addition
subtraction
multiplication
division
exponentiation
Extend the task if ... | #K | K | scalar: 10
vector: 2 3 5
matrix: 3 3 # 7 11 13 17 19 23 29 31 37
scalar * scalar
100
scalar * vector
20 30 50
scalar * matrix
(70 110 130
170 190 230
290 310 370)
vector * vector
4 9 25
vector * matrix
(14 22 26
51 57 69
145 155 185)
matrix * matrix
(49 121 169
289 361 529
841 9... |
http://rosettacode.org/wiki/Element-wise_operations | Element-wise operations | This task is similar to:
Matrix multiplication
Matrix transposition
Task
Implement basic element-wise matrix-matrix and scalar-matrix operations, which can be referred to in other, higher-order tasks.
Implement:
addition
subtraction
multiplication
division
exponentiation
Extend the task if ... | #Kotlin | Kotlin | // version 1.1.51
typealias Matrix = Array<DoubleArray>
typealias Op = Double.(Double) -> Double
fun Double.dPow(exp: Double) = Math.pow(this, exp)
fun Matrix.elementwiseOp(other: Matrix, op: Op): Matrix {
require(this.size == other.size && this[0].size == other[0].size)
val result = Array(this.size) { Do... |
http://rosettacode.org/wiki/Draw_a_sphere | Draw a sphere | Task
Draw a sphere.
The sphere can be represented graphically, or in ASCII art, depending on the language capabilities.
Either static or rotational projection is acceptable for this task.
Related tasks
draw a cuboid
draw a rotating cube
write language name in 3D ASCII
draw a Deathstar
| #Action.21 | Action! | INT ARRAY SinTab=[
0 4 9 13 18 22 27 31 36 40 44 49 53 58 62 66 71 75 79 83
88 92 96 100 104 108 112 116 120 124 128 132 136 139 143
147 150 154 158 161 165 168 171 175 178 181 184 187 190
193 196 199 202 204 207 210 212 215 217 219 222 224 226
228 230 232 234 236 237 239 241 242 243 245 246 247 248
249 250... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #Ada | Ada | procedure Insert (Anchor : Link_Access; New_Link : Link_Access) is
begin
if Anchor /= Null and New_Link /= Null then
New_Link.Next := Anchor.Next;
New_Link.Prev := Anchor;
if New_Link.Next /= Null then
New_Link.Next.Prev := New_Link;
end if;
Anchor.Next := New_Link;
end if;
... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #ALGOL_68 | ALGOL 68 | #!/usr/local/bin/a68g --script #
# SEMA do link OF splice = LEVEL 1 #
MODE LINK = STRUCT (
REF LINK prev,
REF LINK next,
DATA value
);
# BEGIN rosettacode task specimen code:
can handle insert both before the first, and after the last link #
PROC insert after = (REF LINK #self,# prev, DATA new data)LINK: ... |
http://rosettacode.org/wiki/Doubly-linked_list/Traversal | Doubly-linked list/Traversal | Traverse from the beginning of a doubly-linked list to the end, and from the end to the beginning.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
Linked list
Queue: Def... | #Action.21 | Action! | SET EndProg=* |
http://rosettacode.org/wiki/Dutch_national_flag_problem | Dutch national flag problem |
The Dutch national flag is composed of three coloured bands in the order:
red (top)
then white, and
lastly blue (at the bottom).
The problem posed by Edsger Dijkstra is:
Given a number of red, blue and white balls in random order, arrange them in the order of the colours in the Dutch national fla... | #Applesoft_BASIC | Applesoft BASIC | 100 READ C$(0),C$(1),C$(2)
110 DATARED,WHITE,BLUE,0
120 PRINT "RANDOM:
130 FOR N = 0 TO 9
140 LET B%(N) = RND (1) * 3
150 GOSUB 250
160 NEXT N
170 PRINT
180 READ S
190 PRINT "SORTED:
200 FOR I = 0 TO 2
210 FOR N = 0 TO 9
220 ON B%(N) = I GOSUB 250
230 NEXT N,I
240 END... |
http://rosettacode.org/wiki/Dutch_national_flag_problem | Dutch national flag problem |
The Dutch national flag is composed of three coloured bands in the order:
red (top)
then white, and
lastly blue (at the bottom).
The problem posed by Edsger Dijkstra is:
Given a number of red, blue and white balls in random order, arrange them in the order of the colours in the Dutch national fla... | #AutoHotkey | AutoHotkey | RandGen(MaxBalls){
Random,k,3,MaxBalls
Loop,% k{
Random,k,1,3
o.=k
}return o
}
While((!InStr(o,1)||!InStr(o,2)||!InStr(o,3))||!RegExReplace(o,"\b1+2+3+\b"))
o:=RandGen(3)
Loop,% StrLen(o)
F.=SubStr(o,A_Index,1) ","
F:=RTrim(F,",")
Sort,F,N D`,
MsgBox,% F:=RegExReplace(RegExReplace(RegExReplace(F,"(1)","Red"),"(2)",... |
http://rosettacode.org/wiki/Draw_a_cuboid | Draw a cuboid | Task
Draw a cuboid with relative dimensions of 2 × 3 × 4.
The cuboid can be represented graphically, or in ASCII art, depending on the language capabilities.
To fulfill the criteria of being a cuboid, three faces must be visible.
Either static or rotational projection is acceptable for this task.
R... | #Ada | Ada | with Ada.Text_IO;
procedure Main is
type Char_Matrix is
array (Positive range <>, Positive range <>) of Character;
function Create_Cuboid
(Width, Height, Depth : Positive)
return Char_Matrix
is
Result : Char_Matrix (1 .. Height + Depth + 3,
1 .. 2 * Width + De... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Lasso | Lasso | local(thename = web_request->param('thename')->asString)
if(#thename->size) => {^
var(#thename = math_random)
var(#thename)
else
'<a href="?thename=xyz">Please give the variable a name!</a>'
^} |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Lingo | Lingo | -- varName might contain a string that was entered by a user at runtime
-- A new global variable with a user-defined name can be created at runtime like this:
(the globals)[varName] = 23 -- or (the globals).setProp(varName, 23)
-- An new instance variable (object property) with a user-defined name can be created at... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Logo | Logo | ? make readword readword
julie
12
? show :julie
12 |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #Go | Go | package main
import (
"fmt"
"image"
"image/color"
"image/draw"
)
func main() {
rect := image.Rect(0, 0, 320, 240)
img := image.NewRGBA(rect)
// Use green background, say.
green := color.RGBA{0, 255, 0, 255}
draw.Draw(img, rect, &image.Uniform{green}, image.ZP, draw.Src)
/... |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Lua | Lua | function egyptian_divmod(dividend,divisor)
local pwrs, dbls = {1}, {divisor}
while dbls[#dbls] <= dividend do
table.insert(pwrs, pwrs[#pwrs] * 2)
table.insert(dbls, pwrs[#pwrs] * divisor)
end
local ans, accum = 0, 0
for i=#pwrs-1,1,-1 do
if accum + dbls[i] <= dividend then
... |
http://rosettacode.org/wiki/Egyptian_fractions | Egyptian fractions | An Egyptian fraction is the sum of distinct unit fractions such as:
1
2
+
1
3
+
1
16
(
=
43
48
)
{\displaystyle {\tfrac {1}{2}}+{\tfrac {1}{3}}+{\tfrac {1}{16}}\,(={\tfrac {43}{48}})}
Each fraction in the expression has a numerator equal to 1 (unity) and a denominator that... | #Nim | Nim | import strformat, strutils
import bignum
let
Zero = newInt(0)
One = newInt(1)
#---------------------------------------------------------------------------------------------------
proc toEgyptianrecursive(rat: Rat; fracs: seq[Rat]): seq[Rat] =
if rat.isZero: return fracs
let iquo = cdiv(rat.denom, rat.... |
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 ... | #SNOBOL4 | SNOBOL4 |
define('halve(num)') :(halve_end)
halve eq(num,1) :s(freturn)
halve = num / 2 :(return)
halve_end
define('double(num)') :(double_end)
double double = num * 2 :(return)
double_end
define('odd(num)') :(odd_end)
odd eq(num,1) :s(return)
eq(num,double(halve(num))) :s(freturn)f(return)
odd_end l = trim(input)
... |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #Quackery | Quackery | ( the Cellular Automaton is on the stack as 3 items, the )
( Rule (R), the Size of the space (S) and the Current )
( state (C). make-ca sets this up from a string indicating )
( the size and starting state, and a rule number. )
[ [] swap
8 times
[ dup 1 &
rot swap join
... |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #Racket | Racket | #lang racket
(require racket/fixnum)
(provide usable-bits/fixnum usable-bits/fixnum-1 CA-next-generation
wrap-rule-truncate-left-word show-automaton)
(define usable-bits/fixnum 30)
(define usable-bits/fixnum-1 (sub1 usable-bits/fixnum))
(define usable-bits/mask (fx- (fxlshift 1 usable-bits/fixnum) 1))
(defin... |
http://rosettacode.org/wiki/Factorial | Factorial | Definitions
The factorial of 0 (zero) is defined as being 1 (unity).
The Factorial Function of a positive integer, n, is defined as the product of the sequence:
n, n-1, n-2, ... 1
Task
Write a function to return the factorial of a number.
Solutions can be iterat... | #Visual_Basic | Visual Basic |
Option Explicit
Sub Main()
Dim i As Variant
For i = 1 To 27
Debug.Print "Factorial(" & i & ")= , recursive : " & Format$(FactRec(i), "#,###") & " - iterative : " & Format$(FactIter(i), "#,####")
Next
End Sub 'Main
Private Function FactRec(n As Variant) As Variant
n = CDec(n)
If n = 1 T... |
http://rosettacode.org/wiki/Echo_server | Echo server | Create a network service that sits on TCP port 12321, which accepts connections on that port, and which echoes complete lines (using a carriage-return/line-feed sequence as line separator) back to clients. No error handling is required. For the purposes of testing, it is only necessary to support connections from local... | #Phix | Phix | -- demo\rosetta\EchoServer.exw
without js
include builtins\sockets.e
constant ESCAPE = #1B
procedure echo(atom sockd)
?{"socket opened",sockd}
string buffer = ""
integer bytes_sent
bool first = true
while true do
{integer len, string s} = recv(sockd)
if len<=0 then exit end if
... |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #Kotlin | Kotlin | // Version 1.3.21
typealias Range = Triple<Int, Int, Boolean>
fun main() {
val rgs = listOf<Range>(
Range(2, 1000, true),
Range(1000, 4000, true),
Range(2, 10_000, false),
Range(2, 100_000, false),
Range(2, 1_000_000, false),
Range(2, 10_000_000, false),
R... |
http://rosettacode.org/wiki/Draw_a_rotating_cube | Draw a rotating cube | Task
Draw a rotating cube.
It should be oriented with one vertex pointing straight up, and its opposite vertex on the main diagonal (the one farthest away) straight down. It can be solid or wire-frame, and you can use ASCII art if your language doesn't have graphical capabilities. Perspective is optional.
Related ... | #FreeBASIC | FreeBASIC | #define PI 3.14159265358979323
#define SCALE 50
#define SIZE 320
#define zoff 0.5773502691896257645091487805019574556
#define cylr 1.6329931618554520654648560498039275946
screenres SIZE, SIZE, 4
dim as double theta = 0.0, dtheta = 1.5, x(0 to 5), lasttime, dt = 1./30
dim as double cylphi(0 to 5) = {PI/6, 5*PI/6, 3*... |
http://rosettacode.org/wiki/Element-wise_operations | Element-wise operations | This task is similar to:
Matrix multiplication
Matrix transposition
Task
Implement basic element-wise matrix-matrix and scalar-matrix operations, which can be referred to in other, higher-order tasks.
Implement:
addition
subtraction
multiplication
division
exponentiation
Extend the task if ... | #Maple | Maple | # Built-in element-wise operator ~
#addition
<1,2,3;4,5,6> +~ 2;
#subtraction
<2,3,1,4;0,-2,-2,1> -~ 4;
#multiplication
<2,3,1,4;0,-2,-2,1> *~ 4;
#division
<2,3,7,9;6,8,4,5;7,0,10,11> /~ 2;
#exponentiation
<1,2,0; 7,2,7; 6,11,3>^~5; |
http://rosettacode.org/wiki/Draw_a_sphere | Draw a sphere | Task
Draw a sphere.
The sphere can be represented graphically, or in ASCII art, depending on the language capabilities.
Either static or rotational projection is acceptable for this task.
Related tasks
draw a cuboid
draw a rotating cube
write language name in 3D ASCII
draw a Deathstar
| #Ada | Ada | with Glib; use Glib;
with Cairo; use Cairo;
with Cairo.Png; use Cairo.Png;
with Cairo.Pattern; use Cairo.Pattern;
with Cairo.Image_Surface; use Cairo.Image_Surface;
with Ada.Numerics;
procedure Sphere is
subtype Dub is Glib.Gdouble;
Surface : Cairo_Surface;
C... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #ALGOL_W | ALGOL W | % record type to hold an element of a doubly linked list of integers %
record DListIElement ( reference(DListIElement) prev
; integer iValue
; reference(DListIElement) next
);
% additional record types would be required for othe... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #AutoHotkey | AutoHotkey | Lbl INSERT
{r₁+2}ʳ→{r₂+2}ʳ
r₁→{r₂+4}ʳ
r₂→{{r₂+2}ʳ+4}ʳ
r₂→{r₁+2}ʳ
r₁
Return |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #Axe | Axe | Lbl INSERT
{r₁+2}ʳ→{r₂+2}ʳ
r₁→{r₂+4}ʳ
r₂→{{r₂+2}ʳ+4}ʳ
r₂→{r₁+2}ʳ
r₁
Return |
http://rosettacode.org/wiki/Doubly-linked_list/Traversal | Doubly-linked list/Traversal | Traverse from the beginning of a doubly-linked list to the end, and from the end to the beginning.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
Linked list
Queue: Def... | #Ada | Ada | with Ada.Containers.Doubly_Linked_Lists;
with Ada.Text_IO;
procedure Traversing is
package Char_Lists is new Ada.Containers.Doubly_Linked_Lists (Character);
procedure Print (Position : in Char_Lists.Cursor) is
begin
Ada.Text_IO.Put (Char_Lists.Element (Position));
end Print;
My_List : Char_Li... |
http://rosettacode.org/wiki/Doubly-linked_list/Traversal | Doubly-linked list/Traversal | Traverse from the beginning of a doubly-linked list to the end, and from the end to the beginning.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
Linked list
Queue: Def... | #ALGOL_68 | ALGOL 68 | # Node struct - contains next and prev NODE pointers and DATA #
MODE NODE = STRUCT(
DATA data,
REF NODE prev,
REF NODE next
);
# List structure - contains head and tail NODE pointers #
MODE LIST = STRUCT(
REF NODE head,
REF NODE tail
);
# --- PREPEND - Adds a node to the beginni... |
http://rosettacode.org/wiki/Dutch_national_flag_problem | Dutch national flag problem |
The Dutch national flag is composed of three coloured bands in the order:
red (top)
then white, and
lastly blue (at the bottom).
The problem posed by Edsger Dijkstra is:
Given a number of red, blue and white balls in random order, arrange them in the order of the colours in the Dutch national fla... | #AutoIt | AutoIt |
#include <Array.au3>
Dutch_Flag(50)
Func Dutch_Flag($arrayitems)
Local $avArray[$arrayitems]
For $i = 0 To UBound($avArray) - 1
$avArray[$i] = Random(1, 3, 1)
Next
Local $low = 2, $high = 3, $i = 0
Local $arraypos = -1
Local $p = UBound($avArray) - 1
While $i < $p
if $avArray[$i] < $low Then
$arraypos... |
http://rosettacode.org/wiki/Draw_a_cuboid | Draw a cuboid | Task
Draw a cuboid with relative dimensions of 2 × 3 × 4.
The cuboid can be represented graphically, or in ASCII art, depending on the language capabilities.
To fulfill the criteria of being a cuboid, three faces must be visible.
Either static or rotational projection is acceptable for this task.
R... | #Arturo | Arturo | cline: function [n,a,b,cde][
print (pad to :string first cde n+1) ++
(repeat to :string cde\1 dec 9*a)++
(to :string cde\0)++
(2 < size cde)? -> pad to :string cde\2 b+1 -> ""
]
cuboid: function [x,y,z][
cline y+1 x 0 "+-"
loop 1..y 'i -> cline 1+y-i x i-1 "/ |"
cline 0 x... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Logtalk | Logtalk |
| ?- create_object(Id, [], [set_logtalk_flag(dynamic_declarations,allow)], []),
write('Variable name: '), read(Name),
write('Variable value: '), read(Value),
Fact =.. [Name, Value],
Id::assertz(Fact).
Variable name: foo.
Variable value: 42.
Id = o1,
Name = foo,
Value = 42,
Fact = foo(42).
?... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Lua | Lua | _G[io.read()] = 5 --puts 5 in a global variable named by the user |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #Icon_and_Unicon | Icon and Unicon | #
# draw-pixel.icn
#
procedure main()
&window := open("pixel", "g", "size=320,240")
Fg("#ff0000")
DrawPoint(100, 100)
Event()
end |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #IS-BASIC | IS-BASIC | 100 SET VIDEO X 40:SET VIDEO Y 26:SET VIDEO MODE 5:SET VIDEO COLOR 0
110 OPEN #101:"video:"
120 DISPLAY #101:AT 1 FROM 1 TO 26
130 SET PALETTE BLACK,RED
140 PLOT 100,100 |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Mathematica.2FWolfram_Language | Mathematica/Wolfram Language | ClearAll[EgyptianDivide]
EgyptianDivide[dividend_, divisor_] := Module[{table, i, answer, accumulator},
table = {{1, divisor}};
i = 1;
While[Last[Last[table]] < dividend,
AppendTo[table, 2^i {1, divisor}];
i++
];
table //= Most;
answer = 0;
accumulator = 0;
Do[
If[accumulator + t[[2]] <= divid... |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Modula-2 | Modula-2 | MODULE EgyptianDivision;
FROM FormatString IMPORT FormatString;
FROM Terminal IMPORT WriteString,ReadChar;
PROCEDURE EgyptianDivision(dividend,divisor : LONGCARD; VAR remainder : LONGCARD) : LONGCARD;
CONST
SZ = 64;
VAR
powers,doublings : ARRAY[0..SZ] OF LONGCARD;
answer,accumulator : LONGCARD;
i : IN... |
http://rosettacode.org/wiki/Egyptian_fractions | Egyptian fractions | An Egyptian fraction is the sum of distinct unit fractions such as:
1
2
+
1
3
+
1
16
(
=
43
48
)
{\displaystyle {\tfrac {1}{2}}+{\tfrac {1}{3}}+{\tfrac {1}{16}}\,(={\tfrac {43}{48}})}
Each fraction in the expression has a numerator equal to 1 (unity) and a denominator that... | #PARI.2FGP | PARI/GP |
efrac(f)=my(v=List());while(f,my(x=numerator(f),y=denominator(f));listput(v,ceil(y/x));f=(-y)%x/y/v[#v]);Vec(v);
show(f)=my(n=f\1,v=efrac(f-n)); print1(f" = ["n"; "v[1]); for(i=2,#v,print1(", "v[i])); print("]");
best(n)=my(denom,denomAt,term,termAt,v); for(a=1,n-1,for(b=a+1,n, v=efrac(a/b); if(#v>term, termAt=a/b; t... |
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 ... | #SNUSP | SNUSP | /==!/==atoi==@@@-@-----#
| | /-\ /recurse\ #/?\ zero
$>,@/>,@/?\<=zero=!\?/<=print==!\@\>?!\@/<@\.!\-/
< @ # | \=/ \=itoa=@@@+@+++++#
/==\ \===?!/===-?\>>+# halve ! /+ !/+ !/+ !/+ \ mod10
# ! @ | #>>\?-<+>/ /<+> -\!?-\!?-\!?-\!?-... |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #Raku | Raku | class Automaton {
has $.rule;
has @.cells;
has @.code = $!rule.fmt('%08b').flip.comb».Int;
method gist { "|{ @!cells.map({+$_ ?? '#' !! ' '}).join }|" }
method succ {
self.new: :$!rule, :@!code, :cells(
@!code[
4 «*« @!cells.rotate(-1)
»+«... |
http://rosettacode.org/wiki/Factorial | Factorial | Definitions
The factorial of 0 (zero) is defined as being 1 (unity).
The Factorial Function of a positive integer, n, is defined as the product of the sequence:
n, n-1, n-2, ... 1
Task
Write a function to return the factorial of a number.
Solutions can be iterat... | #Visual_Basic_.NET | Visual Basic .NET | Imports System
Imports System.Numerics
Imports System.Linq
Module Module1
' Type Double:
Function DofactorialI(n As Integer) As Double ' Iterative
DofactorialI = 1 : For i As Integer = 1 To n : DofactorialI *= i : Next
End Function
' Type Unsigned Long:
Function ULfactorialI(n As I... |
http://rosettacode.org/wiki/Echo_server | Echo server | Create a network service that sits on TCP port 12321, which accepts connections on that port, and which echoes complete lines (using a carriage-return/line-feed sequence as line separator) back to clients. No error handling is required. For the purposes of testing, it is only necessary to support connections from local... | #PHP | PHP | $socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_bind($socket, '127.0.0.1', 12321);
socket_listen($socket);
$client_count = 0;
while (true){
if (($client = socket_accept($socket)) === false) continue;
$client_count++;
$client_name = 'Unknown';
socket_getpeername($client, $client_name);
echo "C... |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #Lua | Lua | function makeInterval(s,e,p)
return {start=s, end_=e, print_=p}
end
function main()
local intervals = {
makeInterval( 2, 1000, true),
makeInterval(1000, 4000, true),
makeInterval( 2, 10000, false),
makeInterval( 2, 1000000, false),
makeInterval... |
http://rosettacode.org/wiki/Draw_a_rotating_cube | Draw a rotating cube | Task
Draw a rotating cube.
It should be oriented with one vertex pointing straight up, and its opposite vertex on the main diagonal (the one farthest away) straight down. It can be solid or wire-frame, and you can use ASCII art if your language doesn't have graphical capabilities. Perspective is optional.
Related ... | #FutureBasic | FutureBasic |
include "Tlbx agl.incl"
include "Tlbx glut.incl"
output file "Rotating Cube"
local fn AnimateCube
'~'1
begin globals
dim as double sRotation
end globals
// Speed of rotation
sRotation += 2.9
glMatrixMode( _GLMODELVIEW )
glLoadIdentity()
glTranslated( 0.0, 0.0, 0.0 )
glRotated( sRotation, -0.45, -0.8, -0.6 )
... |
http://rosettacode.org/wiki/Element-wise_operations | Element-wise operations | This task is similar to:
Matrix multiplication
Matrix transposition
Task
Implement basic element-wise matrix-matrix and scalar-matrix operations, which can be referred to in other, higher-order tasks.
Implement:
addition
subtraction
multiplication
division
exponentiation
Extend the task if ... | #Mathematica_.2F_Wolfram_Language | Mathematica / Wolfram Language | S = 10 ; M = {{7, 11, 13}, {17 , 19, 23} , {29, 31, 37}};
M + S
M - S
M * S
M / S
M ^ S
M + M
M - M
M * M
M / M
M ^ M
Gives:
->{{17, 21, 23}, {27, 29, 33}, {39, 41, 47}}
->{{-3, 1, 3}, {7, 9, 13}, {19, 21, 27}}
->{{70, 110, 130}, {170, 190, 230}, {290, 310, 370}}
->{{7/10, 11/10, 13/10}, {17/10, 19/10, 23/10}, {2... |
http://rosettacode.org/wiki/Draw_a_sphere | Draw a sphere | Task
Draw a sphere.
The sphere can be represented graphically, or in ASCII art, depending on the language capabilities.
Either static or rotational projection is acceptable for this task.
Related tasks
draw a cuboid
draw a rotating cube
write language name in 3D ASCII
draw a Deathstar
| #ALGOL_W | ALGOL W | begin
% draw a sphere %
% returns the next integer larger than x or x if x is an integer %
integer procedure ceil( real value x ) ;
begin
integer tmp;
tmp := truncate( x );
if tmp not =... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #BBC_BASIC | BBC BASIC | DIM node{pPrev%, pNext%, iData%}
DIM a{} = node{}, b{} = node{}, c{} = node{}
a.pNext% = b{}
a.iData% = 123
b.pPrev% = a{}
b.iData% = 456
c.iData% = 789
PROCinsert(a{}, c{})
END
DEF PROCinsert(here{}, new{})
LOCAL temp{} : DIM temp{} = node{}
... |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #C | C | void insert(link* anchor, link* newlink) {
newlink->next = anchor->next;
newlink->prev = anchor;
(newlink->next)->prev = newlink;
anchor->next = newlink;
} |
http://rosettacode.org/wiki/Doubly-linked_list/Element_insertion | Doubly-linked list/Element insertion | Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element inse... | #C.23 | C# | static void InsertAfter(Link prev, int i)
{
if (prev.next != null)
{
prev.next.prev = new Link() { item = i, prev = prev, next = prev.next };
prev.next = prev.next.prev;
}
else
prev.next = new Link() { item = i, prev = prev };
} |
http://rosettacode.org/wiki/Doubly-linked_list/Traversal | Doubly-linked list/Traversal | Traverse from the beginning of a doubly-linked list to the end, and from the end to the beginning.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
Linked list
Queue: Def... | #ALGOL_W | ALGOL W | begin
% record type to hold an element of a doubly linked list of integers %
record DListIElement ( reference(DListIElement) prev
; integer iValue
; reference(DListIElement) next
);
% additional record types would be required fo... |
http://rosettacode.org/wiki/Doubly-linked_list/Traversal | Doubly-linked list/Traversal | Traverse from the beginning of a doubly-linked list to the end, and from the end to the beginning.
See also
Array
Associative array: Creation, Iteration
Collections
Compound data type
Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
Linked list
Queue: Def... | #ARM_Assembly | ARM Assembly |
/* ARM assembly Raspberry PI */
/* program transDblList.s */
/* REMARK 1 : this program use routines in a include file
see task Include a file language arm assembly
for the routine affichageMess conversion10S
see at end of this program the instruction include */
/* Constantes */
.equ STDOUT, 1 ... |
http://rosettacode.org/wiki/Dutch_national_flag_problem | Dutch national flag problem |
The Dutch national flag is composed of three coloured bands in the order:
red (top)
then white, and
lastly blue (at the bottom).
The problem posed by Edsger Dijkstra is:
Given a number of red, blue and white balls in random order, arrange them in the order of the colours in the Dutch national fla... | #AWK | AWK |
BEGIN {
weight[1] = "red"; weight[2] = "white"; weight[3] = "blue";
# ballnr must be >= 3. Using very high numbers here may make your computer
# run out of RAM. (10 millions balls ~= 2.5GiB RAM on x86_64)
ballnr = 10
srand()
# Generating a random pool of balls. This python-like loop is actua... |
http://rosettacode.org/wiki/Draw_a_cuboid | Draw a cuboid | Task
Draw a cuboid with relative dimensions of 2 × 3 × 4.
The cuboid can be represented graphically, or in ASCII art, depending on the language capabilities.
To fulfill the criteria of being a cuboid, three faces must be visible.
Either static or rotational projection is acceptable for this task.
R... | #AutoHotkey | AutoHotkey | Angle := 45
C := 0.01745329252
W := 200
H := 300
L := 400
LX := L * Cos(Angle * C), LY := L * Sin(Angle * C)
If !pToken := Gdip_Startup()
{
MsgBox, 48, gdiplus error!, Gdiplus failed to start. Please ensure you have gdiplus on your system
ExitApp
}
OnExit, Exit
A := 50, B := 650, WinWidth := 700, WinHeight :=... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #M2000_Interpreter | M2000 Interpreter |
Module DynamicVariable {
input "Variable Name:", a$
a$=filter$(a$," ,+-*/^~'\({=<>})|!$&"+chr$(9)+chr$(127))
While a$ ~ "..*" {a$=mid$(a$, 2)}
If len(a$)=0 then Error "No name found"
If chrcode(a$)<65 then Error "Not a Valid name"
Inline a$+"=1000"
Print eval(a$)=1000
... |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #M4 | M4 | Enter foo, please.
define(`inp',esyscmd(`echoinp'))
define(`trim',substr(inp,0,decr(len(inp))))
define(trim,42)
foo |
http://rosettacode.org/wiki/Dynamic_variable_names | Dynamic variable names | Task
Create a variable with a user-defined name.
The variable name should not be written in the program text, but should be taken from the user dynamically.
See also
Eval in environment is a similar task.
| #Mathematica_.2F_Wolfram_Language | Mathematica / Wolfram Language | varname = InputString["Enter a variable name"];
varvalue = InputString["Enter a value"];
ReleaseHold[ Hold[Set["nameholder", "value"]] /. {"nameholder" -> Symbol[varname], "value" -> varvalue}];
Print[varname, " is now set to ", Symbol[varname]] |
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #J | J | require 'gl2'
coinsert 'jgl2'
wd'pc Rosetta closeok;cc task isidraw; set task wh 320 200;pshow'
glpaint glpixel 100 100 [ glpen 1 1 [ glrgb 255 0 0 [ glclear ''
|
http://rosettacode.org/wiki/Draw_a_pixel | Draw a pixel | Task
Create a window and draw a pixel in it, subject to the following:
the window is 320 x 240
the color of the pixel must be red (255,0,0)
the position of the pixel is x = 100, y = 100 | #Java | Java | import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
public class DrawAPixel extends JFrame{
public DrawAPixel() {
super("Red Pixel");
setSize(320, 240);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
@Override
public void paint(Graphics g) {
g.setColor(new Co... |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Nim | Nim | import strformat
func egyptianDivision(dividend, divisor: int): tuple[quotient, remainder: int] =
if dividend < 0 or divisor <= 0:
raise newException(IOError, "Invalid argument(s)")
if dividend < divisor:
return (0, dividend)
var powersOfTwo: array[sizeof(int) * 8, int]
var doublings: array[sizeof(i... |
http://rosettacode.org/wiki/Egyptian_division | Egyptian division | Egyptian division is a method of dividing integers using addition and
doubling that is similar to the algorithm of Ethiopian multiplication
Algorithm:
Given two numbers where the dividend is to be divided by the divisor:
Start the construction of a table of two columns: powers_of_2, and doublings; by a first row of... | #Perl | Perl | sub egyptian_divmod {
my($dividend, $divisor) = @_;
die "Invalid divisor" if $divisor <= 0;
my @table = ($divisor);
push @table, 2*$table[-1] while $table[-1] <= $dividend;
my $accumulator = 0;
for my $k (reverse 0 .. $#table) {
next unless $dividend >= $table[$k];
$accumulat... |
http://rosettacode.org/wiki/Egyptian_fractions | Egyptian fractions | An Egyptian fraction is the sum of distinct unit fractions such as:
1
2
+
1
3
+
1
16
(
=
43
48
)
{\displaystyle {\tfrac {1}{2}}+{\tfrac {1}{3}}+{\tfrac {1}{16}}\,(={\tfrac {43}{48}})}
Each fraction in the expression has a numerator equal to 1 (unity) and a denominator that... | #Perl | Perl | use strict;
use warnings;
use bigint;
sub isEgyption{
my $nr = int($_[0]);
my $de = int($_[1]);
if($nr == 0 or $de == 0){
#Invalid input
return;
}
if($de % $nr == 0){
# They divide so print
printf "1/" . int($de/$nr);
return;
}
if($nr % $de == 0){
# Invalid fraction
printf $nr/$de;
r... |
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 ... | #Soar | Soar | ##########################################
# multiply takes ^left and ^right numbers
# and a ^return-to
sp {multiply*elaborate*initialize
(state <s> ^superstate.operator <o>)
(<o> ^name multiply
^left <x>
^right <y>
^return-to <r>)
-->
(<s> ^name multiply
^left <x>
^righ... |
http://rosettacode.org/wiki/Elementary_cellular_automaton | Elementary cellular automaton | An elementary cellular automaton is a one-dimensional cellular automaton where there are two possible states (labeled 0 and 1) and the rule to determine the state of a cell in the next generation depends only on the current state of the cell and its two immediate neighbors. Those three values can be encoded with three ... | #Ruby | Ruby | class ElemCellAutomat
include Enumerable
def initialize (start_str, rule, disp=false)
@cur = start_str
@patterns = Hash[8.times.map{|i|["%03b"%i, "01"[rule[i]]]}]
puts "Rule (#{rule}) : #@patterns" if disp
end
def each
return to_enum unless block_given?
loop do
yield @cur
str... |
http://rosettacode.org/wiki/Factorial | Factorial | Definitions
The factorial of 0 (zero) is defined as being 1 (unity).
The Factorial Function of a positive integer, n, is defined as the product of the sequence:
n, n-1, n-2, ... 1
Task
Write a function to return the factorial of a number.
Solutions can be iterat... | #Vlang | Vlang | const max_size = 10
fn factorial_i() {
mut facs := [0].repeat(max_size + 1)
facs[0] = 1
println('The 0-th Factorial number is: 1')
for i := 1; i <= max_size; i++ {
facs[i] = i * facs[i - 1]
num := facs[i]
println('The $i-th Factorial number is: $num')
}
}
fn main() {
factorial_i()
} |
http://rosettacode.org/wiki/Echo_server | Echo server | Create a network service that sits on TCP port 12321, which accepts connections on that port, and which echoes complete lines (using a carriage-return/line-feed sequence as line separator) back to clients. No error handling is required. For the purposes of testing, it is only necessary to support connections from local... | #PicoLisp | PicoLisp | (setq Port (port 12321))
(loop
(setq Sock (listen Port)) # Listen
(NIL (fork) (close Port)) # Accepted
(close Sock) ) # Parent: Close socket and continue
# Child:
(prinl (stamp) " -- (Pid " *Pid ") Client connected from " *Adr)
(in Sock
(until (eof) ... |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #Nim | Nim | import strformat
proc iseban(n: int): bool =
if n == 0:
return false
var b = n div 1_000_000_000
var r = n mod 1_000_000_000
var m = r div 1_000_000
r = r mod 1_000_000
var t = r div 1_000
r = r mod 1_000
m = if m in 30..66: m mod 10 else: m
t = if t in 30..66: t mod 10 else: t
r = if r in 30.... |
http://rosettacode.org/wiki/Eban_numbers | Eban numbers |
Definition
An eban number is a number that has no letter e in it when the number is spelled in English.
Or more literally, spelled numbers that contain the letter e are banned.
The American version of spelling numbers will be used here (as opposed to the British).
2,000,000,000 is two billio... | #Perl | Perl | use strict;
use warnings;
use feature 'say';
use Lingua::EN::Numbers qw(num2en);
sub comma { reverse ((reverse shift) =~ s/(.{3})/$1,/gr) =~ s/^,//r }
sub e_ban {
my($power) = @_;
my @n;
for (1..10**$power) {
next unless 0 == $_%2;
next if $_ =~ /[789]/ or /[12].$/ or /[135]..$/ or /[135... |
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