Pointer MCQs

Question 1

What is the purpose of the 'free' function in C when used with pointers?

Accepted Answer

Deallocate memory

Answer

Allocate memory

Answer

Create a new pointer

Answer

Modify the pointer's value

Question 2

In C, what is a pointer to a constant value (const int*)?

Accepted Answer

A pointer to a constant value

Answer

A pointer that cannot be modified

Answer

A pointer that points to a constant value

Answer

A constant pointer

Question 3

What is the result of the expression ptr-- in C, where ptr is a pointer?

Accepted Answer

Move ptr to the previous memory location

Answer

Decrease the value of ptr by 1

Answer

Increase the value of ptr by 1

Answer

It's not a valid operation

Question 4

In C, what is a function pointer?

Accepted Answer

A pointer that points to a function

Answer

A pointer returned by a function

Answer

A pointer to a variable

Answer

A constant pointer

Question 5

What is the result of the expression &array[0] in C, where array is an integer array?

Accepted Answer

Address of the first element in the array

Answer

Value of the first element in the array

Answer

Size of the array

Answer

Type of the array

Question 6

In C, what is a null pointer (NULL or 0)?

Accepted Answer

A pointer that points to the address 0

Answer

A pointer that points to a null value

Answer

A pointer with an undefined value

Answer

A pointer to a null object

Question 7

What is the result of the expression ptr += 2 in C, where ptr is a pointer?

Accepted Answer

Move ptr two memory locations forward

Answer

Increase ptr by 2

Answer

Decrease ptr by 2

Answer

It's not a valid operation

Question 8

In C, what is the purpose of the 'calloc' function?

Accepted Answer

Allocate memory for an array of variables

Answer

Allocate memory on the stack

Answer

Allocate memory on the heap

Answer

Allocate memory for a function

Question 9

What is the result of the expression *ptr = 42 in C, where ptr is a pointer to an int?

Accepted Answer

Set the value pointed to by ptr to 42

Answer

Set the address pointed to by ptr to 42

Answer

Set the size of ptr to 42

Answer

Set ptr to a null value