Pointers and References in C++ MCQ question and answer with solution

1

What is a pointer in C++?

A) A variable that stores the size of another variable B) A variable that stores the address of another variable C) A variable that stores a reference to another variable D) None of the above

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

2

How do you declare a pointer variable in C++?

A) ptr *type; B) type ptr; C) type *ptr; D) ptr type;

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

3

What is the output of the following code: int x = 5; int *ptr = &x; cout << *ptr; in C++?

A) Address of x B) Garbage value C) Compilation error D) 5

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

4

What is the correct syntax to dereference a pointer in C++?

A) *ptr B) ptr* C) &ptr D) ptr

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

5

What is the purpose of the 'nullptr' keyword in C++?

A) Represents a null type B) Represents a null value C) Represents a null reference D) Represents a null pointer

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

6

What does the 'nullptr' keyword replace in C++11 and later versions?

A) nullptr pointer B) Null value C) NULL pointer D) Null reference

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

7

What is the purpose of the 'reference' in C++?

A) Value of an existing variable B) Alias to an existing variable C) Address of an existing variable D) None of the above

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

8

What is the output of the following code: int x = 5; int &ref = x; cout << ref; in C++?

A) Compilation error B) Garbage value C) 5 D) Address of x

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

9

What happens when a reference is declared but not initialized in C++?

A) Undefined behavior B) Default-initialized to null C) Initialized to a default value D) Compilation error

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

10

How do you declare a reference variable in C++?

A) type &ref; B) ref type; C) type ref; D) &type ref;

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Pointers and References in C++ MCQ question and answer with solution | C++ Programimg MCQs