C FAQs: Questions and Answers

This page covers frequently asked C questions and answers. These FAQs are useful for interviews and viva examinations.

Here’s a list of the top 10 C FAQs:

1. Explain the scope of a static variable with an example.

2. What’s the difference between the operators n++ and ++n?

3. Explain the difference between a structure and a union with an example.

4. Can more variables be passed to the main function? If so, how?

5. Explain the difference between pass by value and pass by reference.

6. What is the difference between malloc and calloc functions in C?

7. Declare and define a double-dimensional array. Write the same with the use of pointers.

8. Write a program to determine if an entered number is prime or not.

9. Write a program to swap two numbers without using a third variable.

10. What is a volatile variable, and how is it different from a normal C variable?