C Programming Quiz

What will be the output of the following code? #include int main() { int a = 10; if (a = 5) { printf("True\n"); } else { printf("False\n"); } return 0; }

• True

• False

• Compile-time error

• Undefined behavior

What is the difference between malloc() and calloc() in C?

• malloc() initializes allocated memory, calloc() does not

• calloc() initializes allocated memory, malloc() does not

• malloc() is used for static allocation, calloc() for dynamic allocation

• Both are identical

Which of the following function declarations is correct in C?

• int function(int x, y);

• int function(int x, int y) { return x + y; }

• int function(int x, int y);

• function(int x, int y) -> int;

What is the size of an integer on a 64-bit system using GCC (typically)?

• 4 bytes

• 8 bytes

• 2 bytes

• Depends on the compiler

What will be the output of this program? #include void swap(int *x, int *y) { int temp = *x; *x = *y; *y = temp; } int main() { int a = 5, b = 10; swap(&a, &b); printf("%d %d\n", a, b); return 0; }

• 10 5

• 5 10

• Compile-time error

• Undefined behavior

What does the sizeof operator return?

• The size of a pointer

• The size of a variable or type in bits

• The size of a variable or type in bytes

• None of the above

What will be the output of this program? #include int main() { int arr[] = {10, 20, 30, 40}; printf("%d\n", *(arr + 2)); return 0; }

• 10

• 20

• 30

• 40

Which of the following statements about pointers is true?

• Pointer arithmetic is not allowed in C

• NULL pointer is the same as an uninitialized pointer

• A pointer can point to a function in C

• You cannot modify the value of a constant through a pointer

What will happen if you use gets() to read input in C?

• It safely reads a line of input

• It may cause buffer overflow

• It terminates the program

• It automatically adds a newline character

What is the correct way to declare a pointer to an integer in C?

• int *p;

• int p*;

• int* p;

• Both a and c