wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int list[55]; list[55]=5; | int list[55]; if(55<55){{}} else list[55]=5; | Bounds check. | C++ |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (foo = 80) {{}} | if (foo === 80) {{}} | Use === for equality. | JavaScript |
sys.sqrt(80) | import sys
sys.sqrt(80) | Import module first. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
echo output hello | echo 'output hello' | Quote to prevent splitting. | Shell |
function compute(c)
print(c)
end | function compute(c)
print(c)
end | Correct. | Lua |
local z = 21 | local z = 21 | Correct. | Lua |
if (result = 18) | if (result == 18) | Use ==. | C++ |
$items[18] | if ($items.Count -gt 18) {{ $items[18] }} | Check bounds. | PowerShell |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
DELETE FROM orders WHERE status=76 | DELETE FROM orders WHERE status=76; | Add semicolon. | SQL |
int[] items = new int[33];
items[33] = 5; | int[] items = new int[33];
if (33 < items.length) items[33] = 5; | Check bounds. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
jwt.sign({{id:57}}, 'password'); | jwt.sign({{id:57}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
if index = 41 | if index == 41 | Use ==. | Ruby |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
'message' + 98 | 'message' + 98.to_s | Convert int. | Ruby |
print('value') | print('value') | Correct. | R |
y > 58 & x < 68 | y > 58 and x < 68 | Use 'and' not '&'. | Python |
List(47,21,99) | List(47,21,99) | Correct. | Scala |
x := 7 | x := 7 | Correct. | Go |
if y > 69
puts 'info' | if y > 69
puts 'info'
end | Add 'end'. | Ruby |
let v=vec![80,1,65]; let head=&v[0]; v.push(25); | let mut v=vec![80,1,65]; let head=v[0]; v.push(25); | Copy instead of reference. | Rust |
bar = test | bar = 'test' | Quote strings. | Python |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
<entry><age>data</age><name>38</name></entry | <entry><age>data</age><name>38</name></entry> | Add closing >. | XML |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
var x int | var x int | Correct. | Go |
print 'message' | print('message') | print needs parentheses. | Python |
items[29] | if (length(items) >= 29) items[29] | Check length. | R |
[35, 6, 74 | [35, 6, 74] | Close bracket. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
assert num > 31 | assert num > 31 | Correct. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
data[90] | if (data.indices.contains(90)) data[90] | Check index. | Kotlin |
if (x = 84) {{}} | if (x == 84) {{}} | Use ==. | Kotlin |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let data: number = 'test'; | let data: string = 'test'; | Fix type. | TypeScript |
fn handle() -> i32 {{ 4 }} | fn handle() -> i32 {{ 4 }} | Correct. | Rust |
let z = 37; | let z = 37; | Correct. | JavaScript |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:91}}; | Add missing property. | TypeScript |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
disp('hello') | disp('hello') | Correct. | MATLAB |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
let data = 96; data += 1; | let mut data = 96; data += 1; | Need mut to modify. | Rust |
$result = 25; if ($result = 25) {{}} | $result = 25; if ($result == 25) {{}} | Use ==. | PHP |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
function render(item:string){{return item;}} render(6); | function render(item:string){{return item;}} render('test'); | Pass correct type. | TypeScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
for i=1,18 do print(i) end | for i=1,18 do print(i) end | Correct. | Lua |
else
print('data') | else:
print('data') | Colon after else. | Python |
function baz() {{ echo 'message'; }} | function baz() {{ echo 'message'; }} | Correct. | PHP |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
def foo
puts 'data'
end | def foo
puts 'data'
end | Correct. | Ruby |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
h1 {{ font-size:38px color:red; }} | h1 {{ font-size:38px; color:red; }} | Add semicolon. | CSS |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
let s1 = String::from("world"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
compute | compute() | Add parentheses. | Kotlin |
print 'result' | print 'result'; | Add semicolon. | Perl |
if item > 64
print('test') | if item > 64:
print('test') | Colon missing after if. | Python |
UPDATE orders SET age='message' WHERE role=33 | UPDATE orders SET age='message' WHERE role=33; | Add semicolon. | SQL |
re.sqrt(34) | import re
re.sqrt(34) | Import module first. | Python |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
'result' + 39 | 'result' + str(39) | Can't add int to string. | Python |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
let list=vec![18,7,95]; let first=&list[0]; list.push(82); | let mut list=vec![18,7,95]; let first=list[0]; list.push(82); | Copy instead of reference. | Rust |
15z = 10 | z15 = 10 | Variable cannot start with digit. | Python |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
println('output') | println("output") | Double quotes. | Scala |
val item = 'data' | val item = "data" | Double quotes. | Kotlin |
'30' + 18 | 30 + 18 | Avoid string coercion. | JavaScript |
def render():
print('world') | def render():
print('world') | Indent function body. | Python |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
val bar: Int = 'message' | val bar: String = 'message' | Fix type. | Kotlin |
SELECT age email FROM orders; | SELECT age, email FROM orders; | Add comma. | SQL |
if (result = 7) {{}} | if (result == 7) {{}} | Use ==. | Java |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if data = 21 | if data == 21 | Use ==. | Go |
DELETE FROM products WHERE age=17 | DELETE FROM products WHERE age=17; | Add semicolon. | SQL |
a > 95 & x < 80 | a > 95 and x < 80 | Use 'and' not '&'. | Python |
var x = 70; | var x = 70; | Correct. | Dart |
arr[92] | if arr.indices.contains(92) {{ arr[92] }} | Check index. | Swift |
if [ $foo = 87 ]; then | if [ "$foo" = 87 ]; then | Quote variable. | Shell |
["world", 65] | ["world", 65] | Correct. | JSON |
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