wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
h1 {{ font-size:67px color:blue; }} | h1 {{ font-size:67px; color:blue; }} | Add semicolon. | CSS |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
let z = 48; let z = 22; | let z = 48; z = 22; | Duplicate declaration. | JavaScript |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
if z = 40 then
print('test')
end | if z == 40 then
print('test')
end | Use ==. | Lua |
let str1 = String::from("result"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("result"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
$values[70] = 5; | if (isset($values[70])) $values[70] = 5; | Check existence. | PHP |
local num = 43 | local num = 43 | Correct. | Lua |
y = 5 | y=5 | No spaces. | Shell |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
class User {{ int b; }}
obj.b=5; | class User {{ public int b; }}
obj.b=5; | Make field public. | Java |
[56, 100, 19 | [56, 100, 19] | Close bracket. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
bar | bar() | Add parentheses. | Kotlin |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
x := 86 | x := 86 | Correct. | Go |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(80); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(80); | Correct. | Node.js |
val index = 'result' | val index = "result" | Double quotes. | Kotlin |
yield c | yield c | Correct yield. | Python |
function test() {{
return
{{key:'message'}}
}} | function test() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
JOIN orders ON users.id = orders.age | JOIN orders ON users.id = orders.age | Correct. | SQL |
SELECT name status FROM products; | SELECT name, status FROM products; | Add comma. | SQL |
let vec=vec![77,6,40]; let head=&vec[0]; vec.push(26); | let mut vec=vec![77,6,40]; let head=vec[0]; vec.push(26); | Copy instead of reference. | Rust |
with open('config.json') as f:
data = f.read() | with open('config.json') as f:
data = f.read() | Correct. | Python |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
for foo in range(45)
print(foo) | for foo in range(45):
print(foo) | Colon after for. | Python |
SELECT * FROM orders WHRE name=74; | SELECT * FROM orders WHERE name=74; | Fix WHERE. | SQL |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
["test", 19] | ["test", 19] | Correct. | JSON |
switch(index){{ case 92: break; }} | switch(index){{ case 92: break; default: break; }} | Add default case. | Java |
for i=1,12 do print(i) end | for i=1,12 do print(i) end | Correct. | Lua |
["info", 94] | ["info", 94] | Correct. | JSON |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
int[] values = new int[61];
values[61] = 5; | int[] values = new int[61];
if (61 < values.length) values[61] = 5; | Check bounds. | Java |
let result = 91; result += 1; | let mut result = 91; result += 1; | Need mut to modify. | Rust |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
INSERT INTO products VALUES ('data',92) | INSERT INTO products (name, role) VALUES ('data',92); | Specify columns. | SQL |
for c in range(56)
print(c) | for c in range(56):
print(c) | Colon after for. | Python |
class Person {{ int c; }}; | class Person {{ public: int c; }}; | Make public. | C++ |
let c = 'output' | let c = "output" | Double quotes. | Swift |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let y: number | null = null; y.toFixed(83); | let y: number | null = null; if(y!==null) y.toFixed(83); | Null check. | TypeScript |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
name: value
age: 20 | name: value
age: 20 | Correct. | YAML |
disp('message') | disp('message') | Correct. | MATLAB |
let b: Int = 'world' | let b: String = 'world' | Fix type. | Swift |
SELECT * FROM items WHRE age=68; | SELECT * FROM items WHERE age=68; | Fix WHERE. | SQL |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if num = 5 | if num == 5 | Use ==. | Go |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:14}}; | Add missing property. | TypeScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
list[30] | if (length(list) >= 30) list[30] | Check length. | R |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
print 'world' | print('world') | print needs parentheses. | Python |
var result int = 'value' | var result string = 'value' | Type mismatch. | Go |
WHERE id = '62' | WHERE id = 62 | Don't quote integer. | SQL |
'output' + 18 | 'output' + 18.to_s | Convert int. | Ruby |
val c = 27; c = 87 | var c = 27; c = 87 | Use var for reassignment. | Scala |
if [ $a = 49 ]; then | if [ "$a" = 49 ]; then | Quote variable. | Shell |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for (int i=0; i<51; i++) {{}} | for (int i=0; i<51; i++) {{}} | Correct. | Java |
'hello' + 64 | 'hello' + str(64) | Can't add int to string. | Python |
function process(c:string){{return c;}} process(94); | function process(c:string){{return c;}} process('test'); | Pass correct type. | TypeScript |
<br></br> | <br> | Self-closing. | HTML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
$x = 16; if ($x = 16) {{}} | $x = 16; if ($x == 16) {{}} | Use ==. | PHP |
while a > 74
a -= 1 | while a > 74:
a -= 1 | Colon missing after while. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (temp = 85) {{}} | if (temp === 85) {{}} | Use === for equality. | JavaScript |
x := 37 | x := 37 | Correct. | Go |
else
print('test') | else:
print('test') | Colon after else. | Python |
{{"status":"result",}} | {{"status":"result"}} | Remove trailing comma. | JSON |
{{"name":"test" "age":40}} | {{"name":"test", "age":40}} | Add comma. | JSON |
List(70,8,5) | List(70,8,5) | Correct. | Scala |
if (z = 8) {{}} | if (z == 8) {{}} | Use ==. | Java |
baz | baz() | Add parentheses. | Swift |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
if (a = 11) {{}} | if (a == 11) {{}} | Use ==. | Kotlin |
items.forEach(function(count) {{ console.log(count); }}) | items.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
h1 {{ font-size:30px color:#fff; }} | h1 {{ font-size:30px; color:#fff; }} | Add semicolon. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
$items[82] | if ($items.Count -gt 82) {{ $items[82] }} | Check bounds. | PowerShell |
if y = 89 | if y == 89 | Use ==. | Ruby |
DELETE FROM orders WHERE status=29 | DELETE FROM orders WHERE status=29; | Add semicolon. | SQL |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
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