C Developer Interview Questions & Answers

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C Developers are software developers generally responsible for developing code that integrates into the operating systems, operating system modules, embedded systems, or low-level libraries for other high-level languages such as Python and Java.

Whether you're a job seeker preparing to be interviewed for the role of C Developer or an employer preparing to interview candidates for C Developer position, these C Developer interview questions will help you prepare yourself for the job interview session.

C Developer Interview Questions

Below are a list of some skill-based C Developer interview questions.

1. What has been the most complex application system you have coded using C language? Tell us about your experience.
2. What do you think is the most difficult part of being a C developer?
3. What are the benefits of C when developing operating systems and kernel modules?
4. Why is it important to integrate C language when building high-level coding applications?
5. When should the keyword “void” be used in a function?
6. Should you declare all header files in every C program?
7. What is a comment and how do you insert one in a C program?
8. How do logical, run-time and syntax errors differ?
9. What is the difference between source codes and object codes?
10. Describe the functions of a compiler and an interpreter.
11. What is the difference between a variable and a constant?
12. What are some benefits of using C instead of another programming language?
13. When should you use an array instead of individual variables?
14. How can you sort data in C programming?
15. Why are algorithms vital to C programming?
16. What are some features of the C programming language?
17. Describe the difference between compilers and interpreters.
18. What are the different errors that could happen during the execution of code?
19. How do you think data structure helps in everyday life?
20. How many control structures are in programming and what are they?
21. How do you deal with obstructions to the proficiency of sorting files?
22. What is a pointer?  
23. Explain why C is known as a mother language.
24. What are the basic data types associated with C?
25. What are reserved words with a programming language?
26. What is the explanation for the dangling pointer in C?
27. Describe static function with its usage?
28. What is the difference between abs() and fabs() functions?
29. Describe Wild Pointers in C?
30. What is the difference between ++a and a++?
31. Describe the difference between = and == symbols in C programming?
32. What is the explanation for prototype function in C?
33. What is a nested loop?
34. What is the general form of function in C?
35. What is a pointer on a pointer in C programming language?
36. What is a NULL pointer in C?
37. What is a far pointer in C?
38. What is dangling pointer in C?
39. What are the valid places to have keyword “Break”?
40. What is a sequential access file?
41. What is the method to save data in a stack data structure type?
42. Is it possible to use curly brackets ({}) to enclose a single line code in C program?
43. Describe the modifier in C?
44. What are the modifiers available in C programming language?
45. What is the process to generate random numbers in C programming language?
46. Why is C called a mid-level programming language?
47. What is the difference between the local variable and global variable in C?
48. What is the difference between call by value and call by reference in C?
49. What is recursion in C?
50. What is static memory allocation?
51. What is dynamic memory allocation?
52. What functions are used for dynamic memory allocation in C language?
53. What is an auto keyword in C?
54. Can we compile a program without main() function?
55. What is a token?
56. What is command line argument?
57. What is the difference between getch() and getche()?
58. What is the newline escape sequence?
59. What is the difference between near, far and huge pointers?
60. What is typecasting?
61. What is an infinite loop?
62. Suppose a global variable and local variable have the same name. Is it is possible to access a global variable from a block where local variables are defined?
63. Differentiate between the macros and the functions.
64. What are the limitations of scanf() and how can it be avoided?
65. Which structure is used to link the program and the operating system?
66. How can you remove duplicates in an array?
67. Explain the # pragma directive
68. How can you print a string with the symbol % in it?
69. What is the difference between ‘g’ and “g” in C?
70. Which is better #define or enum?
71. Can you tell me how to check whether a linked list is circular?
72. What is Bubble Sort Algorithm? Explain with a program.
73. What is Round-robin algorithm? Write a code for Round Robin Scheduling.
74. Write a program to swap two numbers without using the third variable?
75. Write a program to print Fibonacci series without using recursion?
76. Write a program to print Fibonacci series using recursion?
77. Write a program to check prime number in C Programming?
78. Write a program to check palindrome number in C Programming?
79. Write a program to print factorial of given number without using recursion?
80. Write a program to reverse a given number in C?

C Developer Interview Questions and Answers

Every interview is different and the questions may vary. However, there are lots of general questions that get asked at every interview.

Below are some common questions you'd expect during C Developer interviews. Click on each question to see how to answer them.

1. What is Your Greatest Weakness?
2. What is Your Salary Expectation?
3. Tell Me About Yourself
4. Why Do You Want To Leave Your Current Job?
5. Are You a Leader or a Follower?
6. What is Your Greatest Strength?
7. Do You Have Any Questions for Us?
8. Why Should We Hire You?
9. What Is Your Greatest Accomplishment?
10. Why Do You Want This Job?

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