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Top 30 C Interview Questions and Answers

05/Oct/2021 | 5 minutes to read


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. How will you differentiate C and C++?

C and C++ both programming languages are used to develop computer applications but there are dew differences between them as follows.

  • C is a function driven procedural programming language whereas C++ is an object-oriented programming language.
  • Because of object-oriented nature C++ supports hiding, inheritance, Polymorphism but C does not support these concepts as its procedural language.
  • Exception handling is not supported by C but C++ does.
  • C++ focuses more on data because of its object-oriented nature whereas C focuses more on process or method.
For more visit C vs C++.

2. Explain commonly used built-in functions in C Programming.

3. What is the Preprocessor? How will you include a preprocessor in your C Program?

4. How will you convert a string to number?

6. How will you convert a number to string?

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.


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 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.