Pointer MCQs

Question 1

In C, what is the purpose of the 'const' keyword when used with a pointer declaration?

Accepted Answer

To make the pointer point to a constant value

Answer

To declare a constant pointer

Answer

To make the pointer constant

Answer

To prevent pointer declaration

Question 2

What is the result of the expression &variable in C, where variable is a variable of type int?

Accepted Answer

Address of variable

Answer

Value of variable

Answer

Size of variable

Answer

Type of variable

Question 3

In C, what is a double pointer (int**)?

Accepted Answer

A pointer to a pointer

Answer

A pointer to an integer

Answer

A pointer that can store two addresses

Answer

A pointer to a double data type

Question 4

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

Accepted Answer

Initialize ptr to 0

Answer

Delete the pointer ptr

Answer

Set ptr to a random address

Answer

It's not a valid operation

Question 5

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

Accepted Answer

Allocate memory on the heap

Answer

Allocate memory on the stack

Answer

Allocate memory for a function

Answer

Allocate memory for a variable

Question 6

What is the result of the expression *NULL in C?

Accepted Answer

Error

Answer

Null pointer dereference

Answer

0

Answer

Undefined

Question 7

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

Accepted Answer

Copy the contents of one memory location to another

Answer

Copy the contents of one pointer to another

Answer

Create a new pointer

Answer

Swap two pointers

Question 8

What is the result of the expression sizeof(char*) in C, assuming a char pointer on a typical system?

Accepted Answer

4

Answer

8

Answer

2

Answer

1

Question 9

In C, how do you declare an array of pointers to integers?

Accepted Answer

int* arr[];

Answer

arr int*[];

Answer

int arr*[];

Answer

int[]* arr;