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C++ OOP Viva Questions

 

1. What is OOP?

OOP is a programming approach based on objects and classes.

2. What are the main features of OOP?

Encapsulation, Abstraction, Inheritance, Polymorphism.

3. What is a class?

A class is a blueprint for creating objects.

4. What is an object?

An object is an instance of a class.

5. Difference between class and object?

Class is a design, object is a real-world implementation.

6. What is encapsulation?

Wrapping data and functions together into a single unit.

7. How is encapsulation achieved in C++?

Using classes and access specifiers.

8. What is data hiding?

Protecting data using private access specifier.

9. What are access specifiers in C++?

public, private, protected.

10. What is inheritance?

Inheritance allows one class to use properties of another class.

11. Why inheritance is used?

To reuse code and reduce redundancy.

12. Types of inheritance in C++?

Single, Multiple, Multilevel, Hierarchical, Hybrid.

13. What is polymorphism?

One name, many forms.

14. Types of polymorphism?

Compile-time and Runtime polymorphism.

15. What is function overloading?

Functions with same name but different parameters.

16. What is operator overloading?

Redefining operators for user-defined data types.

17. What is runtime polymorphism?

Polymorphism achieved using virtual functions.

18. What is virtual function?

A function that is called using object pointer at runtime.

19. Why virtual function is needed?

To achieve dynamic binding.

20. What is dynamic binding?

Function call resolved at runtime.

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