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

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

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Welcome back!

Preparing for interviews or placements? These top 20 C++ interview questions with answers will help you revise important concepts and build confidence 💻

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🌟 Why These Questions?

- Commonly asked in interviews
- Focus on OOP concepts
- Helpful for beginners & students

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🔟 Basic Questions

1. What is C++?

C++ is a general-purpose, 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?

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 instance of a class.

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6. What is inheritance?

Mechanism where one class acquires properties of another.

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7. What is polymorphism?

One function, multiple forms.

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8. What is encapsulation?

Wrapping data and functions together.

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9. What is abstraction?

Hiding implementation details.

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10. What is a constructor?

Special function called when object is created.

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🔟 Important Interview Questions

11. What is a destructor?

Function called when object is destroyed.

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12. What is function overloading?

Same function name with different parameters.

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13. What is operator overloading?

Giving new meaning to operators.

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14. What is a virtual function?

Function that can be overridden.

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15. What is a pure virtual function?

Declared with =0, no definition.

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16. What is an abstract class?

Class with at least one pure virtual function.

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17. What is ‘this’ pointer?

Points to current object.

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18. What is a reference variable?

Alias for another variable.

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19. Difference between == and = ?

== → comparison
= → assignment

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20. What are new and delete?

Used for dynamic memory allocation.

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⭐ Tips for Interview

- Focus on OOP concepts
- Practice coding
- Answer confidently

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📌 Conclusion

These were top 20 C++ interview questions.
Revise them to crack interviews and exams 🚀

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📢 Also Read

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

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