TECHTRIX2025 BUGHUNT SET5

What's the correct replacement for the faulty line? #include int main() { char *ptr = "Hello"; *ptr = 'h'; // Faulty line printf("%s", ptr); return 0; }

• char ptr[] = "Hello";

• ptr[0] = 'h';

• char *ptr = strdup("Hello");

• Both A and C

What’s the correct way to allocate memory? int *arr; arr = malloc(5 * sizeof(int)); What should be done before using arr?

• if (arr == NULL) exit(1);

• memset(arr, 0, sizeof(arr));

• free(arr);

• Nothing, malloc never fails

What’s wrong with this pointer code? #include void func(int **ptr) { int val = 10; *ptr = &val; } int main() { int *p; func(&p); printf("%d", *p); return 0; }

• val goes out of scope

• p is uninitialized

• No error

• Memory leak

What’s the output? #include int main() { int x = 5; int y = (x++, x + 5); printf("%d", y); return 0; }

• 5

• 10

• 11

• Error

What will be printed? #include int main() { int x = 5; printf("%d", x+++x); return 0; }

• 10

• 11

• Error

• Undefined behavior

What does this bitwise code print? #include int main() { int a = 5; printf("%d", a & -a); return 0; }

• 5

• 1

• -5

• 0

Find the output. #include int main() { int x = 10; int y = x-- - --x; printf("%d", y); return 0; }

• 0

• 2

• Undefined

• 10

What is the output? #include int main() { int arr[3] = {10, 20, 30}; int *ptr = arr; printf("%d", *(ptr + 2)); return 0; }

• 10

• 20

• 30

• Error

What happens here? #include int main() { int x = 5; int *p = &x; printf("%d", ++*p); return 0; }

• 5

• 6

• Segmentation Fault

• Error

What's printed? #include int main() { int x = 2; if (x & 1) printf("Odd"); else printf("Even"); return 0; }

• Odd

• Even

• Error

• Undefined