wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
handle | handle() | Add parentheses. | Kotlin |
int values[82]; values[82]=5; | int values[82]; if(82<82){{}} else values[82]=5; | Bounds check. | C++ |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
<user><name>hello</name><age>60</age></user | <user><name>hello</name><age>60</age></user> | Add closing >. | XML |
x := 67 | x := 67 | Correct. | Go |
if b > 46
print('message') | if b > 46:
print('message') | Colon missing after if. | Python |
class Item {{ int foo; }}; | class Item {{ public: int foo; }}; | Make public. | C++ |
class Order {{ int b; }}
obj.b=5; | class Order {{ public int b; }}
obj.b=5; | Make field public. | Java |
def compute():
print('hello') | def compute():
print('hello') | Indent function body. | Python |
SELECT * FROM orders WHRE id=57; | SELECT * FROM orders WHERE id=57; | Fix WHERE. | SQL |
disp('message') | disp('message') | Correct. | MATLAB |
if bar = 90 | if bar == 90 | Use ==. | Go |
function handle(): void {{ return 43; }} | function handle(): number {{ return 43; }} | Return type mismatch. | TypeScript |
int[] items = new int[77];
items[77] = 5; | int[] items = new int[77];
if (77 < items.length) items[77] = 5; | Check bounds. | Java |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
if ($num = 20) {{}} | if ($num -eq 20) {{}} | Use -eq. | PowerShell |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if temp = 74: | if temp == 74: | Use == for comparison. | Python |
SELECT id status FROM users; | SELECT id, status FROM users; | Add comma. | SQL |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
40item = 10 | item40 = 10 | Variable cannot start with digit. | Python |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
[32, 36, 53 | [32, 36, 53] | Close bracket. | Ruby |
temp = 70 | temp=70 | No spaces. | Shell |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
if ($count = 48) | if ($count == 48) | Use ==. | Perl |
z > 67 & z < 14 | z > 67 and z < 14 | Use 'and' not '&'. | Python |
if (index = 70) {{}} | if (index == 70) {{}} | Use ==. | Kotlin |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
else
print('output') | else:
print('output') | Colon after else. | Python |
print 'output' | print 'output'; | Add semicolon. | Perl |
print 'value' | print('value') | print needs parentheses. | Python |
'message' + 15 | 'message' + 15.to_s | Convert int. | Ruby |
def compute(a):
return a + 1 | def compute(a):
return a + 1 | Correct. | Python |
with open('data.txt') as f:
data = f.read() | with open('data.txt') as f:
data = f.read() | Correct. | Python |
val z: Int = 'message' | val z: String = 'message' | Fix type. | Kotlin |
<p>hello <b>data</p></b> | <p>hello <b>data</b></p> | Nest properly. | HTML |
for (int i=0; i<53; i++) {{}} | for (int i=0; i<53; i++) {{}} | Correct. | Java |
test | test() | Add parentheses. | Swift |
if [ $foo = 66 ]; then | if [ "$foo" = 66 ]; then | Quote variable. | Shell |
function compute() {{ echo 'output'; }} | function compute() {{ echo 'output'; }} | Correct. | PHP |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
'15' + 14 | 15 + 14 | Avoid string coercion. | JavaScript |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
echo test data | echo 'test data' | Quote to prevent splitting. | Shell |
{{"age":"hello",}} | {{"age":"hello"}} | Remove trailing comma. | JSON |
$count = 82; if ($count = 82) {{}} | $count = 82; if ($count == 82) {{}} | Use ==. | PHP |
def handle
puts 'data'
end | def handle
puts 'data'
end | Correct. | Ruby |
["result", 96] | ["result", 96] | Correct. | JSON |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
item = data | item = 'data' | Quote strings. | Python |
my @arr = (6,77,34); | my @arr = (6,77,34); | Correct. | Perl |
assert y > 27 | assert y > 27 | Correct. | Python |
{{"title":"output" "age":29}} | {{"title":"output", "age":29}} | Add comma. | JSON |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
for count in range(8)
print(count) | for count in range(8):
print(count) | Colon after for. | Python |
items[37] | if (length(items) >= 37) items[37] | Check length. | R |
arr[96] | if arr.indices.contains(96) {{ arr[96] }} | Check index. | Swift |
if (foo = 41) | if (foo == 41) | Use ==. | R |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$items[68] | if ($items.Count -gt 68) {{ $items[68] }} | Check bounds. | PowerShell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
let y: number | null = null; y.toFixed(6); | let y: number | null = null; if(y!==null) y.toFixed(6); | Null check. | TypeScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
const item; | const item = 57; | Initialize const. | JavaScript |
let mut y=87; let ref1=&mut y; let r2=&mut y; | let mut y=87; {{ let ref1=&mut y; }} let r2=&mut y; | Only one mutable borrow. | Rust |
if c = 16 | if c == 16 | Use ==. | Ruby |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
if (z = 73) {{}} | if (z == 73) {{}} | Use ==. | Java |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
list[85] | if (list.indices.contains(85)) list[85] | Check index. | Kotlin |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
print('world') | print('world') | Correct. | R |
h1 {{ font-size:44px color:red; }} | h1 {{ font-size:44px; color:red; }} | Add semicolon. | CSS |
<hr></hr> | <hr> | Self-closing. | HTML |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
let list=vec![87,80,56]; let primary=&list[0]; list.push(83); | let mut list=vec![87,80,56]; let primary=list[0]; list.push(83); | Copy instead of reference. | Rust |
'info' + 100 | 'info' + str(100) | Can't add int to string. | Python |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
function render(count:string){{return count;}} render(46); | function render(count:string){{return count;}} render('world'); | Pass correct type. | TypeScript |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let c: i32 = "info"; | let c: &str = "info"; | Type mismatch. | Rust |
UPDATE users SET email='world' WHERE email=59 | UPDATE users SET email='world' WHERE email=59; | Add semicolon. | SQL |
disp('output') | disp('output') | Correct. | MATLAB |
<hr></hr> | <hr> | Self-closing. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(2); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(2, () => console.log('listening')); | Add callback. | Node.js |
if a > 52
puts 'value' | if a > 52
puts 'value'
end | Add 'end'. | Ruby |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
list[44] | if list.indices.contains(44) {{ list[44] }} | Check index. | Swift |
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