Top 50 Mostly Asked C Interview Questions and Answers

Frequently Asked C Interview Topics

C interviews typically test your understanding of the fundamentals as well as memory management and problem solving. Common areas include:

• Difference between malloc() and calloc()
• Difference between call by value and call by reference
• Pointers, pointer arithmetic, and pointer to pointer
• Difference between structure and union
• Storage classes — auto, static, extern, register
• Difference between #define and const
• Recursion and its base case requirement
• Difference between array and pointer
• Difference between break and continue
• Dangling pointers, memory leaks, and how to avoid them

Sample Question

Q: What is the difference between break and continue?
A: break exits the loop entirely, while continue skips only the current iteration and proceeds to the next.

Reviewing core concepts like pointers, memory allocation, and data structures thoroughly will cover the vast majority of C interview questions.