Top C Programming Interview Questions and Answers

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C is the most popular language worldwide. It is the middle level language developed by Dennis Ritche in the early 1970. The course includes definitions of common bugs that appear in the C programming and know how to avoid them. It will help applicant excel at job interviews for software companies. So, spend a few hours on the course to gain definitive edge over the peers.

These C programming interview questions and answers will help you to improve your chances of getting a job:


Q1. Why is C dubbed as a mother language?


Ans. It is known as a mother language because most of the JVMs, compilers and Kernals are written in C language.


Q2. What do you mean by pointer?


Ans. It is the variable whose value is the address of another variable.


Q3. Name some different storage class specifiers in C?



  • Auto
  • Register
  • Extern
  • Static


Q4. Define Null pointer?


Ans. Null is a special reserved value of a pointer. It is different from uninitialized and dangling pointer.


Q5. When was C language developed?


Ans. It was developed in 1972 at bell laboratories of AT & T.


Q6. What is the use of extern storage specifier?


Ans. It enables you to declare a variable without bringing it into existence.


Q7. Difference between rvalue and Ivalue?


Ans. The term rvalue refers to objects that appear on the right side, while an Ivalue is an expression that appears on the left side.


Q8. Can a program be compiled with main function?


Ans. Yes.



Q9. Define stack?


Ans. It is a data structure which is used to store data in a particular order. Storing data in a stack also known as a PUSH.


Q10. What are header files?


Ans. Header files have definitions of functions and variables, which is imported into any c program with the help of preprocessor #include statement.


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Q11. When is arrow operator used?


Ans. Arrow operator is used to access structure/union elements.


Q12. What are the features of C language?



  • Mid-level programming language
  • Rich Library
  • Memory management
  • Recursion
  • Extensible
  • Structured programming language
  • Pointers
  • Simple


Q13. Can two operators be combined in a single line of program code?


  Ans.  Yes.


Q14. What is a token?


Ans. The smallest individual unit in a C program is known as a token. It can either be a constant, a keyword, a string literal or an identifier.


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Q15. Name the keyword used to perform unconditional branching?


Ans. A go to statement is used to perform unconditional branching.


Q16. What is the use of comma operator?


Ans. It is used to separate two or more expressions.

Eg: printf (“hello”);


Q17. What is the length of an identifier?


Ans. Its length is 32 characters in C.


Q18. What is typecasting?


Ans. It is a way to convert constant from one type to another type.


Q19. How are random numbers generated?


Ans. By using the rand () command.


#include <time.h>

#include <stdlib.h>

Srand (time (NULL));

Int r = rand ();


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Q20. What are the disadvantages of void pointer?



  • Pointer arithmetic is not defined for void pointer
  • Void pointers can’t be dereferenced


Q21. Define compound statements?


Ans. These are made up of two or more program statements that are executed together.


Q22. What is FIFO?


Ans. FIFO means first in first out. It is a cost flow assumption, which is used to remove costs from the inventory account.


Q23. What is the use of built-in stricmp() function?


Ans. It takes two strings and return an integer.


Q24. What is the name of the function used to close the file stream?


Ans. Fclose().


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Q25. What is a structure?


Ans. A user defined data type which enables you to combine different data types to store a particular type of record known as a structure.

If you are someone new to this subject, take up a certification in C programming language and gain the knowledge needed to be an expert in this field.

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