Learning C language becomes easier when you practice through questions. One of the best ways to test your understanding is by solving C programming MCQ questions. These questions cover important topics like loops, functions, arrays, pointers, and memory handling. C is a basic programming language that helps build a strong foundation for learning other languages too. This article includes many C programming MCQ questions with correct answers to help students and beginners improve their skills. Whether you are preparing for exams or just revising, these questions will guide you and make learning more effective and fun.
C Programming MCQ
Q1. Who is the father of C language?
A) Steve Jobs
B) James Gosling
C) Dennis Ritchie
D) Rasmus Lerdorf
Answer: C
Q2. Which symbol is used to declare a pointer in C?
A) &
B) *
C) #
D) %
Answer: B
Q3. Which header file is required for printf() function?
A) stdio.h
B) conio.h
C) math.h
D) string.h
Answer: A
Q4. What is the size of an int on a 32-bit system?
A) 2 bytes
B) 4 bytes
C) 8 bytes
D) Depends on compiler
Answer: B
Q5. Which operator accesses the value stored at a pointer address?
A) &
B) *
C) ->
D) #
Answer: B
Q6. What is the default return type of a C function if not specified?
A) int
B) void
C) float
D) double
Answer: A
Q7. What will be the output of printf(“%d”, 5 == 5);?
A) 0
B) 1
C) 5
D) Error
Answer: B
Q8. Which of the following is a valid keyword in C?
A) class
B) try
C) volatile
D) interface
Answer: C
Q9. Which function reads a string from the user?
A) gets()
B) scanf()
C) getchar()
D) fgets()
Answer: A
Q10. What is the output of sizeof(char) in C?
A) 0
B) 1
C) 2
D) 4
Answer: B
Q11. Which format specifier is used for integers?
A) %c
B) %f
C) %d
D) %s
Answer: C
Q12. Which data type is used to store a character?
A) int
B) char
C) string
D) float
Answer: B
Q13. Which symbol gives the address of a variable?
A) *
B) #
C) &
D) @
Answer: C
Q14. Which function is used to compare strings?
A) strcmp()
B) strcomp()
C) strcompare()
D) compstr()
Answer: A
Q15. Which of the following is a loop in C?
A) switch
B) do-while
C) case
D) typedef
Answer: B
Q16. Which of these is not a valid operator in C?
A) +
B) =
C) ===
D) !=
Answer: C
Q17. Which one is used to allocate memory dynamically?
A) alloc()
B) malloc()
C) memalloc()
D) createmem()
Answer: B
Q18. Which function is used to find the length of a string?
A) length()
B) strlen()
C) strlength()
D) strcount()
Answer: B
Q19. Which function is used to copy a string?
A) copy()
B) strcpy()
C) strcopy()
D) movestr()
Answer: B
Q20. Which is used to terminate a C statement?
A) ,
B) .
C) ;
D) :
Answer: C
Q21. Which keyword is used to define a constant in C?
A) const
B) define
C) static
D) final
Answer: A
Q22. Which function is used to open a file in C?
A) fopen()
B) open()
C) fileopen()
D) start()
Answer: A
Q23. What will be the output of: printf(“%d”, sizeof(3.14));?
A) 4
B) 8
C) 2
D) 1
Answer: A
Q24. Which keyword is used for decision-making in C?
A) loop
B) if
C) switch
D) case
Answer: B
Q25. Which of these is a preprocessor directive?
A) #include
B) %define
C) @define
D) $header
Answer: A
Q26. Which function is used to write to a file?
A) fprintf()
B) fputs()
C) fwrite()
D) All of the above
Answer: D
Q27. Which keyword is used to stop a loop?
A) break
B) exit
C) stop
D) end
Answer: A
Q28. What is the maximum length of an identifier in C?
A) 31 characters
B) 63 characters
C) 255 characters
D) No limit
Answer: A
Q29. Which one is used to skip the current iteration in loops?
A) skip
B) jump
C) continue
D) exit
Answer: C
Q30. What does NULL represent in C?
A) Zero
B) Invalid number
C) Empty pointer
D) No value
Answer: C
Q31. Which of these is used to define macros?
A) #macro
B) #define
C) #const
D) #include
Answer: B
Q32. Which function is used to close a file?
A) fclose()
B) closefile()
C) endfile()
D) fexit()
Answer: A
Q33. Which keyword is used to define a structure?
A) struct
B) structure
C) class
D) object
Answer: A
Q34. Which format specifier is used for characters?
A) %d
B) %c
C) %s
D) %f
Answer: B
Q35. What is the output of: printf(“%d”, 10 % 3);?
A) 3
B) 1
C) 0
D) 10
Answer: B
Q36. Which keyword is used to return a value from a function?
A) send
B) return
C) output
D) yield
Answer: B
Q37. Which symbol is used for comments in C?
A) //
B) —
C) **
D) ;;
Answer: A
Q38. Which of these is not a loop statement?
A) for
B) while
C) repeat
D) do-while
Answer: C
Q39. Which function allocates memory dynamically in C?
A) malloc()
B) dynamic()
C) create()
D) assign()
Answer: A
Q40. Which format specifier is used for float values?
A) %f
B) %lf
C) %d
D) %fl
Answer: A
Q41. What is the extension of a C source file?
A) .java
B) .c
C) .cpp
D) .py
Answer: B
Q 42. Which of the following is a relational operator in C?
A) &&
B) ++
C) >=
D) |=
Answer: C
Q43. Which function is used to allocate zero-initialized memory?
A) malloc()
B) alloc()
C) calloc()
D) zalloc()
Answer: C
Q44. Which keyword defines a new data type name?
A) struct
B) typedef
C) class
D) define
Answer: B
Q45. Which of the following is not a storage class in C?
A) auto
B) static
C) extern
D) constant
Answer: D
Q46. Which of the following is not a valid data type in C?
A) short
B) real
C) long
D) float
Answer: B
Q47. Which operator is used for bitwise OR in C?
A) &&
B) ||
C) |
D) ^
Answer: C
Q48. Which function is used to write a character to the screen?
A) write()
B) putchar()
C) puts()
D) fprint()
Answer: B
Q49. What does ++a do in C?
A) Increments a after use
B) Decrements a before use
C) Increments a before use
D) Increments a twice
Answer: C
Q50. Which of the following is not a valid loop in C?
A) for
B) until
C) while
D) do-while
Answer: B
Q51. Which header file is required for malloc()?
A) stdlib.h
B) stdio.h
C) string.h
D) malloc.h
Answer: A
Q52. What is the ASCII value of character ‘A’?
A) 64
B) 65
C) 66
D) 67
Answer: B
Q53. Which function is used to read formatted input?
A) printf()
B) gets()
C) scanf()
D) read()
Answer: C
Q54. Which function is used to print strings?
A) printf()
B) puts()
C) display()
D) echo()
Answer: B
Q55. Which of the following is a pointer to FILE in C?
A) FILE*
B) File
C) file()
D) FILEVAR
Answer: A
Q56. Which of the following ends string literals in C?
A) /n
B) NULL
C) \0
D) \n
Answer: C
Q57. Which of the following correctly declares a pointer to integer?
A) int ptr;
B) int *ptr;
C) int &ptr;
D) pointer ptr;
Answer: B
Q58. What will a = a + 1; do?
A) Multiply a by 1
B) Add 1 to a
C) Subtract 1 from a
D) Reset a to 1
Answer: B
Q59. Which operator is used for bitwise AND?
A) &
B) &&
C) |
D) ^
Answer: A
Q60. Which header is required for string functions?
A) conio.h
B) string.h
C) stdio.h
D) memory.h
Answer: B
Q 61. Which keyword is used to include libraries in C?
A) include
B) #import
C) #include
D) using
Answer: C
Q 62. Which of the following represents true in C?
A) 1
B) 0
C) -1
D) Any non-zero
Answer: D
Q 63. What is the output of printf(“%d”, 3/2);?
A) 1.5
B) 2
C) 1
D) 0
Answer: C
Q 64. Which operator is used to compare two values?
A) =
B) ==
C) :=
D) !=
Answer: B
Q 65. Which is the correct way to declare a function returning int?
A) function int();
B) int function();
C) func int();
D) return function();
Answer: B
Q 66. Which of the following is used to define multiple conditions in if?
A) ||
B) &&
C) both
D) none
Answer: C
Q 67. Which function is used to convert string to integer?
A) itoa()
B) stoi()
C) atoi()
D) strint()
Answer: C
Q 68. Which of these is used to insert new line in output?
A) /n
B) \n
C) newline
D) enter
Answer: B
Q 69. What is used to end a program in C?
A) exit()
B) return 0;
C) break
D) stop()
Answer: B
Q70. Which of the following is used to initialize arrays?
A) []
B) {}
C) ()
D) <>
Answer: B
Wrapping Up
Practicing C programming MCQ questions is a smart way to strengthen your basic concepts and prepare for exams or interviews. These questions help you recall important facts, understand how C programs work, and improve your problem-solving skills. Whether you are a beginner or just brushing up your knowledge, going through these multiple-choice questions can make learning easier and faster. Make sure to revise regularly and try to understand the reason behind each correct answer. With time and practice, your confidence in C programming will grow, and you’ll be able to write better code with fewer mistakes.
