Question 1

What is the output of: int x = 5; printf("%d", x++);

Accepted Answer

5. Post-increment (x++) uses the current value of x (5) and then increments. So printf prints 5.

Question 2

Which of the following correctly declares a pointer to an integer?

Accepted Answer

int *p;. int *p; declares p as a pointer to an integer. The * means 'pointer to'.

Question 3

What does malloc() return if memory allocation fails?

Accepted Answer

NULL. malloc() returns NULL (a null pointer) when it cannot allocate the requested memory.

Question 4

What is the size of a pointer on a 64-bit system?

Accepted Answer

8 bytes. On a 64-bit system, all pointers are 8 bytes regardless of what type they point to.

Question 5

What is the output of: printf("%d", sizeof(char));

Accepted Answer

1. sizeof(char) is always 1 byte by the C standard.

C Programming MCQ Quiz

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