Which header file is required in C++ to use OOP?

Correct Answer (Detailed Explanation is Below)

A. OOP can be used without using any header file

Detailed Explanation

Explanation:

In C++, Object-Oriented Programming (OOP) concepts like:

• Classes

• Objects

• Inheritance

• Polymorphism

• Encapsulation

are built into the language itself.

You do not need any specific header file to use OOP features.

Header files like:

• iostream → For input/output

• stdlib.h → For general utilities

• stdio.h → C-style input/output

are unrelated to enabling OOP.