wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let x = 'result' | let x = "result" | Double quotes. | Swift |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
print('world') | print('world') | Correct. | R |
[77, 14, 82 | [77, 14, 82] | Close bracket. | Ruby |
[84, 55, 48 | [84, 55, 48] | Close bracket. | Python |
$arr[68] = 5; | if (isset($arr[68])) $arr[68] = 5; | Check existence. | PHP |
val data = 31; data = 90 | var data = 31; data = 90 | Use var for reassignment. | Scala |
h1 {{ font-size:42px color:#333; }} | h1 {{ font-size:42px; color:#333; }} | Add semicolon. | CSS |
'hello' + 22 | 'hello' + str(22) | Can't add int to string. | Python |
let a: Int = 'world' | let a: String = 'world' | Fix type. | Swift |
<person age=60> | <person age="60"> | Quote attribute. | XML |
temp = 27 | temp=27 | No spaces. | Shell |
val val = 'message' | val val = "message" | Double quotes. | Kotlin |
List(79,43,54) | List(79,43,54) | Correct. | Scala |
re.sqrt(68) | import re
re.sqrt(68) | Import module first. | Python |
String num = 'info'; | String num = "info"; | Double quotes. | Java |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
{{"age":"hello" "status":9}} | {{"age":"hello", "status":9}} | Add comma. | JSON |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
if (val = 19) | if (val == 19) | Use ==. | R |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
fn test() -> i32 {{ 34 }} | fn test() -> i32 {{ 34 }} | Correct. | Rust |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
temp = world | temp = 'world' | Quote strings. | Python |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
if (z = 31) {{}} | if (z === 31) {{}} | Use === for equality. | JavaScript |
<p>test <b>hello</p></b> | <p>test <b>hello</b></p> | Nest properly. | HTML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
list(81) | if length(list) >= 81, list(81), end | Check length. | MATLAB |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (b = 99) {} | if (b == 99) {} | Use ==. | Dart |
let text1 = String::from("output"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("output"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
INSERT INTO orders VALUES ('result',96) | INSERT INTO orders (name, role) VALUES ('result',96); | Specify columns. | SQL |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
<br></br> | <br> | Self-closing. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
function process() {{ echo 'test'; }} | function process() {{ echo 'test'; }} | Correct. | PHP |
render | render() | Add parentheses. | Swift |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
def compute():
print('value') | def compute():
print('value') | Indent function body. | Python |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if num = 96 then
print('test')
end | if num == 96 then
print('test')
end | Use ==. | Lua |
SELECT name role FROM users; | SELECT name, role FROM users; | Add comma. | SQL |
jwt.sign({{id:76}}, 'token'); | jwt.sign({{id:76}}, 'token', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
var a int = 'info' | var a string = 'info' | Type mismatch. | Go |
def baz
puts 'output'
end | def baz
puts 'output'
end | Correct. | Ruby |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
class User {{ int item; }}; | class User {{ public: int item; }}; | Make public. | C++ |
class Person {{ int y; }}
obj.y=5; | class Person {{ public int y; }}
obj.y=5; | Make field public. | Java |
function test(val)
print(val)
end | function test(val)
print(val)
end | Correct. | Lua |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
cin >> a
cout << a; | cin >> a;
cout << a; | Add semicolon. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
const p:Person = {{name:'output'}}; | const p:Person = {{name:'output', age:57}}; | Add missing property. | TypeScript |
for item in range(39)
print(item) | for item in range(39):
print(item) | Colon after for. | Python |
let bar: number = 'value'; | let bar: string = 'value'; | Fix type. | TypeScript |
for (int i=0; i<54; i++) {{}} | for (int i=0; i<54; i++) {{}} | Correct. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print 'value' | print('value') | print needs parentheses. | Python |
if ($bar = 79) | if ($bar == 79) | Use ==. | Perl |
<input type='text' value='hello'> | <input type='text' value='hello' name='id'> | Add name attribute. | HTML |
int values[50]; values[50]=5; | int values[50]; if(50<50){{}} else values[50]=5; | Bounds check. | C++ |
age: output
age: world, | age: output
age: world | Remove comma. | YAML |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
let temp: i32 = "data"; | let temp: &str = "data"; | Type mismatch. | Rust |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
int num = 'world'; | String num = 'world'; | Type mismatch. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(68); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(68); | Correct. | Node.js |
#footer {{ color: red; }} | #footer {{ color: red; }} | Correct. | CSS |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
local z = 88 | local z = 88 | Correct. | Lua |
object Order {{ def main(args: Array[String]) = println("result") }} | object Order {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
if (c = 77) | if (c == 77) | Use ==. | Scala |
handle | handle() | Add parentheses. | Kotlin |
function test(bar:string){{return bar;}} test(91); | function test(bar:string){{return bar;}} test('data'); | Pass correct type. | TypeScript |
for i=1,81 do print(i) end | for i=1,81 do print(i) end | Correct. | Lua |
{{'id':96, 'name' 96}} | {{'id':96, 'name':96}} | Colon missing. | Python |
if temp > 79
print('world') | if temp > 79:
print('world') | Colon missing after if. | Python |
let b = 93; | let b = 93; | Correct. | JavaScript |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
function foo() {{
return
{{key:'value'}}
}} | function foo() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
.User {{ color: green; }} | .User {{ color: green; }} | Correct. | CSS |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
name: hello
age: 97 | name: hello
age: 97 | Correct. | YAML |
<hr></hr> | <hr> | Self-closing. | HTML |
if result = 60: | if result == 60: | Use == for comparison. | Python |
<note name='info'/> | <note name="info"/> | Double quotes. | XML |
if count = 79 | if count == 79 | Use ==. | Ruby |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.