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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