question
string | choices
list | answer
int64 | answer_label
string | split
string | subcategories
string | lang
string | second_lang
string | coding_lang
string | notes
string | id
string | set_id
float64 | variation_id
string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
What will this code output?
#include <stdio.h>
int main() {
int x = 10;
int *ptr = NULL;
*ptr = *ptr + 5;
printf("%d", x);
return 0;
}
|
[
"15",
"10",
"5",
"Segmentation fault"
] | 3 |
D
|
test
|
Buggy code
|
eng_Latn
|
C
|
Buggy code - null pointer
|
67-1.1
| 67 |
1.1
|
|
What will this code output?
#include <stdio.h>
int main() {
int x = 10;
/* outer comment /* inner comment */ still commenting */
int *ptr = &x;
*ptr = *ptr + 5;
printf("%d", x);
return 0;
}
|
[
"15",
"10",
"Compilation error",
"5"
] | 2 |
C
|
test
|
Buggy code
|
eng_Latn
|
C
|
Comments across languages - nested comments (error)
|
67-1.14
| 67 |
1.14
|
|
What will this code output?
#include <stdio.h>
int main() {
int x = 10;
int *ptr;
*ptr = *ptr + 5;
printf("%d", x);
return 0;
}
|
[
"15",
"10",
"5",
"Segmentation fault"
] | 3 |
D
|
test
|
Buggy code
|
eng_Latn
|
C
|
Buggy code - uninitialized pointer
|
67-1.2
| 67 |
1.2
|
|
What will this code output?
using System;
class Program {
static void Main() {
int x = 10;
unsafe {
int* ptr = &x;
*ptr = *ptr + 5;
}
Console.WriteLine(x);
}
}
|
[
"15",
"Compilation error",
"10",
"20"
] | 1 |
B
|
test
|
Buggy code
|
eng_Latn
|
C#
|
69-1.1
| 69 |
1.1
|
||
What will this code output?
using System;
class Program {
static void Main() {
int x = 10;
ref readonly int ptr = ref x;
ptr = ptr + 5;
Console.WriteLine(x);
}
}
|
[
"Compilation error",
"15",
"10",
"5"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
C#
|
Buggy code - readonly reference
|
69-1.16
| 69 |
1.16
|
|
What will this code output?
using System;
class Program {
static void Main() {
int x = 10;
ref int? ptr = ref x;
ptr = ptr + 5;
Console.WriteLine(x);
}
}
|
[
"15",
"Compilation error",
"10",
"5"
] | 1 |
B
|
test
|
Buggy code
|
eng_Latn
|
C#
|
Nullable reference
|
69-1.17
| 69 |
1.17
|
|
What will this code output?
using System;
class Program {
static void Main() {
int x = 10;
int* ptr = &x;
*ptr = *ptr + 5;
Console.WriteLine(x);
}
}
|
[
"15",
"Compilation error",
"10",
"20"
] | 1 |
B
|
test
|
Buggy code
|
eng_Latn
|
C#
|
Buggy code - unsafe without keyword
|
69-1.2
| 69 |
1.2
|
|
What will this code output?
using System;
class Program {
static void Main() {
int? x = null;
Console.WriteLine(x + 5);
}
}
|
[
"15",
"10",
"",
"5"
] | 2 |
C
|
test
|
Buggy code
|
eng_Latn
|
C#
|
Buggy code - null reference
|
69-1.3
| 69 |
1.3
|
|
What will this code output?
#include <iostream>
using namespace std;
int main() {
int x = 10;
int *ptr = nullptr;
*ptr = *ptr + 5;
cout << x;
return 0;
}
|
[
"Segmentation fault",
"15",
"10",
"5"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
C++
|
Buggy code - null pointer
|
68-1.1
| 68 |
1.1
|
|
What will this code output?
#include <iostream>
using namespace std;
int main() {
int x = 10;
int &ref;
ref = ref + 5;
cout << x;
return 0;
}
|
[
"15",
"10",
"5",
"Compilation error"
] | 3 |
D
|
test
|
Buggy code
|
eng_Latn
|
C++
|
Buggy code - reference error
|
68-1.2
| 68 |
1.2
|
|
What will this code output?
public class Test {
public static void main(String[] args) {
int[] arr = {3, 1, 4, 1, 5}
int sum = 0;
for (int i = 0; i < arr.length; i += 2) {
sum += arr[i];
}
System.out.println(sum);
}
}
|
[
"Compilation error",
"12",
"9",
"5"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
java
|
Missing semicolon
|
66-1.17
| 66 |
1.17
|
|
What will this code output?
public class Test {
public static void main(String[] args) {
int[] arr = {3, 1, 4, 1, 5};
int sum = 0;
for (int i = 0; i < arr.length; i -= 2) {
sum += arr[i];
}
System.out.println(sum);
}
}
|
[
"12",
"Never terminates",
"9",
"5"
] | 1 |
B
|
test
|
Buggy code
|
eng_Latn
|
java
|
Infinite loop
|
66-1.7
| 66 |
1.7
|
|
What will this code output?
public class Test {
public static void main(String[] args) {
int[] arr = {3, 1, 4, 1, 5};
int sum = 0;
for (int i = 0; i < arr.length; i += 2)
sum += arr[i];
System.out.println(sum);
}
}
|
[
"12",
"Compilation error",
"9",
"5"
] | 1 |
B
|
test
|
Buggy code
|
eng_Latn
|
java
|
Syntax error
|
66-1.8
| 66 |
1.8
|
|
What will this code output?
public class Test {
public static void main(String[] args) {
int[] arr = {3, 1, 4, 1, 5};
int sum = 0;
for (int i = 0; i <= arr.length; i += 2) {
sum += arr[i];
}
System.out.println(sum);
}
}
|
[
"12",
"ArrayIndexOutOfBoundsException",
"9",
"5"
] | 1 |
B
|
test
|
Buggy code
|
eng_Latn
|
java
|
Array bounds
|
66-1.9
| 66 |
1.9
|
|
What will this code output?
def mystery(n):
if n <= 0:
return 0
if n == 2:
return 1
return mystery(n-1) + mystery(n-2)
print(mystery(6))
|
[
"5",
"8",
"6",
"13"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
python
|
Fibonacci series, off by one
|
65-1.1
| 65 |
1.1
|
|
What will this code output?
def mystery(n):
return mystery(n-1) + mystery(n-2)
print(mystery(6))
|
[
"RecursionError: maximum recursion depth exceeded",
"8",
"6",
"13"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
python
|
Fibonacci series with infinite loop
|
65-1.12
| 65 |
1.12
|
|
What will this code output?
def mystery(n):
if n <= 0:
return 0
if n == 1:
return 1
return mystery(n-1) + mystery(n-2)
print(mystery(6))
|
[
"SyntaxError: invalid syntax",
"8",
"6",
"13"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
python
|
Fibonacci series with wrong syntax
|
65-1.13
| 65 |
1.13
|
|
What will this code output?
def mystery(n):
if n <= 0:
return 0
if n == 1:
return 1
return mystery(n-1) + mystery(n-2)
print(mystery(6))
|
[
"IndentationError: unexpected indent",
"8",
"6",
"13"
] | 0 |
A
|
test
|
Buggy code
|
eng_Latn
|
python
|
Fibonacci series with wrong indentation
|
65-1.14
| 65 |
1.14
|
|
What will this code output?
def mystery(n):
if n <= 0:
return 0,
if n == 1:
return 1
return mystery(n-1) + mystery(n-2)
print(mystery(6))
|
[
"8",
"6",
"TypeError: unsupported operand type(s) for +: 'int' and 'tuple'",
"13"
] | 2 |
C
|
test
|
Buggy code
|
eng_Latn
|
python
|
Fibonacci series with bug in the base case
|
65-1.15
| 65 |
1.15
|
|
What will this code output?
#include<iostream>using namespace std;int main(){int x=10;int*ptr=&x;*ptr=*ptr+5;cout<<x;return 0;}
|
[
"15",
"10",
"5",
"Compilation error"
] | 3 |
D
|
test
|
Buggy code, Whitespace variations
|
eng_Latn
|
C++
|
Whitespace variations, bug
|
68-1.6
| 68 |
1.6
|
|
What will this code output?
public class Test {
public static void main(String[] args) {
/* Initialize array
int[] arr = {3, 1, 4, 1, 5};
int sum = 0;
for (int i = 0; i < arr.length; i += 2) {
sum += arr[i];
}
System.out.println(sum);
}
}
|
[
"12",
"9",
"5",
"Compilation error"
] | 3 |
D
|
test
|
Buggy code, Comments across languages
|
eng_Latn
|
java
|
Comments - mismatched block comment
|
66-1.13
| 66 |
1.13
|
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