Top 20 C++ Viva Questions with Answers (Easy Guide)

💻 Top 20 C++ Viva Questions with Answers (Easy Guide)

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Preparing for viva or practical exams? These top 20 C++ viva questions with answers will help you revise important concepts quickly 📘

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🌟 Why These Questions?

- Frequently asked in viva & exams
- Focus on OOP concepts
- Easy to understand answers

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🔟 Basic Questions

1. What is C++?

C++ is an object-oriented programming language developed by Bjarne Stroustrup.

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2. Difference between C and C++?

C is procedural, while C++ supports object-oriented programming (OOP).

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3. What is OOP?

OOP stands for Object-Oriented Programming based on classes and objects.

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4. What is a class?

A class is a blueprint for creating objects.

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5. What is an object?

An object is an instance of a class.

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6. What is inheritance?

Inheritance allows one class to use properties of another class.

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7. What is polymorphism?

Polymorphism allows one function to have multiple forms.

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8. What is encapsulation?

Encapsulation means wrapping data and functions into one unit.

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9. What is abstraction?

Abstraction hides implementation details and shows only essential features.

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10. What is a constructor?

A constructor is a special function that is called automatically when an object is created.

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🔟 Important Viva Questions

11. What is a destructor?

A destructor is called automatically when an object is destroyed.

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12. What is function overloading?

Using same function name with different parameters.

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13. What is operator overloading?

Giving new meaning to operators for user-defined data.

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14. What is a virtual function?

A function that can be overridden in a derived class.

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15. What is a pure virtual function?

A function declared with =0 that has no definition.

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16. What is an abstract class?

A class that contains at least one pure virtual function.

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17. What is ‘this’ pointer?

It refers to the current object.

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18. What is a reference variable?

An alias for another variable.

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19. Difference between == and = ?

== is comparison operator, = is assignment operator.

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20. What are new and delete operators?

Used for dynamic memory allocation and deallocation.

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⭐ Tips for Viva

- Focus on OOP concepts
- Speak clearly and confidently
- Practice basic programs

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📌 Conclusion

These were top 20 C++ viva questions.
Revise them well to perform better in exams 🚀

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📢 Also Read

- C Programs
- Python Interview Questions
- C++ Programs

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