50+ C Programming Interview Questions and Answers

Given below are 50+ C Programming Interview Questions and Answers.

  1. Who were the developers of the C programming language? Ans. In 1970, Dennis Ritchie developed the C programming language in Bell Laboratories.
  2. How would you categorize the C language? Ans. C language is essentially a structured programming language.
  3. Discuss the structure of a C program along with an example. Ans. A C program contains comments, preprocessor directives, global variables, function declaration and definition, and the main function. An example is given here. https://www.programmingempire.com/structure-of-a-c-program/
  4. What do you mean by a token? How many types of tokens are there in the C language? Discuss with examples.
  5. Find the count of smaller neighbour in a series in C language.
  6. Describe the meaning of a Keyword? How many Keywords (reserve words) are in C? Ans. Keywords are pre-defined words known to the compiler of a programming language. They perform a fixed well-defined task. For instance, the keyword for executes a number of statements a specified number of times. A total of 32 keywords are there in C.
  7. Is it possible to swap two numbers without using a third variable? If yes, how?
  8. Explain the meaning of an Identifier with an example?
  9. Describe the Constant and types of constants in C using examples?
  10. What is meant by Back Slash character constants or Escape sequence characters available in C? Give examples of each.
  11. What is meant by a variable? How to create variables in C? Give examples.
  12. What do you mean by a Data Type? Discuss the Data Types present in C?
  13. Give examples to declare a variable and variable initialization.
  14. What do you mean by recursion? Give an example of recursion in C language.
  15. Give examples to perform a task using recursion as well as without using recursion in C language.
  16. What do you mean by the operator? Discuss the types of operators available in the C language.
  17. How many conditional control statements are there in C? What is meant by a conditional control statement?
  18. Discuss the process of creating arrays with examples?
  19. How would you create a Multidimensional Array in C?
  20. What is a string? How is it different from a character array? Give examples.
  21. Discuss some of the important string handling functions in the C language.
  22. In order to help in debugging what kinds of operators are used in C?
  23. What is the purpose of ! operator? Explain with an example.
  24. Discuss the operator precedence?
  25. Discuss strcat() and strcmp() functions with an example of each.
  26. What do you mean by a function? Compare built-in functions and user-defined functions.
  27. What are function arguments? Distinguish between actual and formal arguments.
  28. What is the purpose of using void type?
  29. What is recursion?
  30. When and why static variables are used in C? How do we use them?
  31. Explain Call By Value and Call By Reference in C with examples.
  32. How do we create and use arrays in C?
  33. Describe the Null pointer with an example.
  34. What is a far pointer?
  35. Discuss the Dangling pointer with an example.
  36. How to create pointer to pointer in C?
  37. Explain dynamic memory allocation and how we achieve it in C?
  38. Discuss with an example of each of the dynamic memory allocation functions in C.
  39. Compare malloc() and calloc().
  40. When do we use a structure? Discuss the usage of structure in C with an example.
  41. Describe union in C with an example.
  42. How do we use command line arguments in C?
  43. Compare near pointer and far pointer.
  44. What is meant by the scope of a variable? Discuss the variable scope with examples in C.
  45. What does the sprint() function do? Explain with an example.
  46. Is it possible to write a C program without using the main() function?
  47. How would you use command line arguments in a C program?
  48. Discuss typecasting with the help of examples in C language.
  49. What is a file pointer?
  50. How would you create an array using pointers?
  51. Give an example of representing a two-dimensional array using pointers.
  52. How do you pass a function as a parameter using pointers?

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