B CompE Bachelor of Computer Engineering Bachelor of Computer Engineering C Language 2

Question 1

What is the result of the expression `5 >> 1` in C?

Accepted Answer

2

Answer

Right-shifting 5 (binary 101) by 1 position yields 2 (binary 010).

Question 2

Which storage class specifier in C limits a variable's visibility to the file in which it is declared?

Accepted Answer

static

Answer

A file-scope variable declared with `static` has internal linkage, making it invisible outside that translation unit.

Question 3

In C, what does the `volatile` qualifier tell the compiler?

Accepted Answer

Do not cache the variable in a register; always read from memory

Answer

`volatile` prevents the compiler from optimizing accesses, ensuring every read/write goes to actual memory.

Question 4

What is the output of: `printf("%d", sizeof('A'));` in a typical 32-bit C implementation?

Accepted Answer

4

Answer

In C, character literals have type `int`, so `sizeof('A')` equals `sizeof(int)`, which is 4 on most 32-bit platforms.

Question 5

Which function is used to release memory allocated by `malloc`?

Accepted Answer

free

Answer

`free()` is the standard C library function to deallocate memory previously allocated by `malloc`, `calloc`, or `realloc`.

B CompE Bachelor of Computer Engineering Practice Test