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Top 30 C++ Interview Questions and Answers

05/Oct/2021 | 5 minutes to read

programming

Here is a List of essential C++ Interview Questions and Answers for Freshers and mid level of Experienced Professionals. All answers for these C++ questions are explained in a simple and easiest way. These basic, advanced and latest C++ questions will help you to clear your next Job interview.

C++ Interview Questions and Answers

These interview questions are targeted for C++ Programming language. You must know the answers of these frequently asked C++ interview questions to clear the interview.

1. Explain something about C++ Programming Language.

C++ is a general purpose programming language which is an extension of C programming and provides object-oriented, generic features. It is a general purpose programming language - used to develop different types of software applications. For more visit C++ Programming Language.

2. What data types does C++ provide?

C++ offers below data types to work with different types of data.
  • Primitive Data Types are built-in types such as int, char, float, double, bool etc.
  • Derived Data Types are the types which are derived from built-in types such as Function, Array, Pointer, Reference.
  • Abstract or User-Defined Data Types are the data types defined by the user such as Class, Structure, Union, Enumeration, Typedef defined DataType
For more visit Data types in C++.

3. Explain Implicit and Explicit type conversion in C++.

C++ supports both Implicit and Explicit Type conversions.
  • Implicit Type Conversion - When Compiler converts the data of one type to another type automatically, It is known as Implicit Type conversion or Automatic Type conversion. If you are converting numbers then you will experience some data loss from higher data type to lower data type conversion. For example: 
    
    int main() {
    // assigning an int type value to my_int
    int my_int = 4;

    // double type variable declaration
    double my_double;

    // implicit conversion
    // assigning int value to a double data type variable
    my_double = my_int;
  • Explicit Type Conversion - When you manually convert the data from one type to another is known as Type Casting or Explicit Conversion. You can implement explicit type conversion in many ways as follows.
    • C-Style Conversion - It's cast notation in C. For example: 
      
                    // syntax
                    (data_type)expression;
    • Using Functions - You can use functions. For example:
      
                    // syntax
                    data_type(expression);
    • Using Type Conversion Operators - C++ offers four type conversion operators - static_cast, dynamic_cast, const_cast, reinterpret_cast.
For more visit Type Conversion in C++.

4. What do you know about OOPs concepts?

C++ allows you to build the systems using object-oriented programming features. Object-Oriented as the name suggests - use the real world entities like objects, hiding, Inheritance, Polymorphism in programming. C++ offers and allows you to use many OOPs concepts as below.

  • Class
  • Object
  • Abstraction
  • Encapsulation
  • Inheritance
  • Polymorphism
  • Message Passing
  • Dynamic Binding
We have a separate article for interview questions on OOPs concepts - OOPs Concepts interview questions and OOPs in C++.

Some General Interview Questions for C++

1. How much will you rate yourself in C++?

When you attend an interview, Interviewer may ask you to rate yourself in a specific Technology like C++, So It's depend on your knowledge and work experience in C++.

2. What challenges did you face while working on C++?

This question may be specific to your technology and completely depends on your past work experience. So you need to just explain the challenges you faced related to C++ in your Project.

3. What was your role in the last Project related to C++?

It's based on your role and responsibilities assigned to you and what functionality you implemented using C++ in your project. This question is generally asked in every interview.

4. How much experience do you have in C++?

Here you can tell about your overall work experience on C++.

5. Have you done any C++ Certification or Training?

It depends on the candidate whether you have done any C++ training or certification. Certifications or training are not essential but good to have.

Conclusion

We have covered some frequently asked C++ Interview Questions and Answers to help you for your Interview. All these Essential C++ Interview Questions are targeted for mid level of experienced Professionals and freshers.
While attending any C++ Interview if you face any difficulty to answer any question please write to us at info@qfles.com. Our IT Expert team will find the best answer and will update on the portal. In case we find any new C++ questions, we will update the same here.