“Top 120 C Programming MCQs with Answers 2026”
Q1. Which of the following is a valid C variable name?
A. int B. float C. total_marks D. continue Answer: C
Q2. Which operator is used to access the value at the address stored in a pointer?
A. & B. * C. -> D. % Answer: B
Q3. What is the default return type of a function in C if not specified?
A. int B. void C. float D. char Answer: A
Q4. Which of the following is not a storage class in C?
A. auto
B. register
C. static
D. volatile
Answer: D
Q5. What will be the output of printf("%d", sizeof(char));?
A. 0 B. 1 C. 2 D. 4 Answer: B
Q6. Which of the following functions is used to read a string from the user in C?
A. scanf()
B. gets()
C. fgets()
D. read()
Answer: B
Explanation: gets() reads a string until newline, but it is unsafe. fgets() is safer.
Q7. What is the output of printf("%d", 5/2);?
A. 2.5 B. 2 C. 3 D. Error Answer: B Explanation: Integer division truncates the decimal part.
Q8. Which keyword is used to define a constant in C?
A. const B. static C. define D. final Answer: A
Q9. Which of the following is used to dynamically allocate memory in C?
A. malloc() B. calloc() C. realloc() D. All of the above Answer: D
Q10. What is the size of an int on most modern compilers?
A. 2 bytes B. 4 bytes C. 8 bytes D. Depends on compiler Answer: D
Q11. Which of the following is a valid declaration of a pointer in C?
A. int p; B. int *p; C. pointer int p; D. int &p; Answer: B
Q12. What is the output of printf("%c", 'A' + 1);?
A. A B. B C. C D. Error Answer: B Explanation: ASCII value of 'A' is 65, adding 1 gives 66 which corresponds to 'B'.
Q13. Which function is used to compare two strings in C?
A. strcmp() B. strcopy() C. strcat() D. strcomp() Answer: A
Q14. Which of the following is true about arrays in C?
A. Array index starts at 1 B. Array index starts at 0 C. Array index starts at -1 D. Array index can start anywhere Answer: B
Q15. What is the output of printf("%d", sizeof(3.14));?
A. 2
B. 4
C. 8
D. Depends on compiler
Answer: C
Q16. Which of the following is the correct way to declare a structure in C?
A. struct student { int id; char name[20]; }; B. structure student { int id; char name[20]; }; C. student struct { int id; char name[20]; }; D. declare struct student { int id; char name[20]; }; Answer: A
Q17. Which operator is used for bitwise AND in C?
A. && B. & C. | D. ^ Answer: B
Q18. What is the output of printf("%d", 10 % 3);?
A. 1
B. 2
C. 3
D. 0
Answer: B
Explanation: 10 divided by 3 leaves a remainder of 1, but % gives remainder → 10 % 3 = 1.
Q19. Which function is used to open a file in C?
A. fopen() B. openfile() C. fileopen() D. fcreate() Answer: A
Q20. Which keyword is used to exit from a loop in C?
A. stop B. exit C. break D. continue Answer: C
Q21. Which of the following is the correct syntax to declare a function in C?
A. function int sum(int a, int b); B. int sum(int a, int b); C. declare sum(int a, int b); D. sum(int a, int b) int; Answer: B
Q22. Which loop is guaranteed to execute at least once in C?
A. for loop
B. while loop
C. do…while loop
D. nested loop
Answer: C
Explanation: The do…while loop executes the body first before checking the condition.
Q23. Which of the following is used to define macros in C?
A. #macro B. #define C. #include D. #typedef Answer: B
Q24. Which operator is used to access members of a structure through a pointer?
A. . B. -> C. * D. & Answer: B
Q25. What is the output of printf("%d", 2 << 1);?
A. 2 B. 4 C. 8 D. 1 Answer: B
Q26. Which of the following is the correct way to declare an array in C?
A. int arr[10]; B. array int arr(10); C. int arr = [10]; D. declare arr[10] int; Answer: A
Q27. What is the output of printf("%d", 7 & 3);?
A. 1 B. 2 C. 3 D. 7 Answer: C Explanation: Bitwise AND of 7 (111) and 3 (011) is 3 (011).
Q28. Which of the following functions is used to write formatted output to a file in C?
A. fprintf() B. fwrite() C. fputs() D. fprint() Answer: A
Q29. Which keyword is used to define an enumeration in C?
A. enum B. enumerate C. typedef D. struct Answer: A
Q30. What is the output of printf("%d", sizeof(0.5f));?
A. 2 B. 4 C. 8 D. Depends on compiler Answer: B
Q31. Which of the following is the correct way to declare a pointer to a function in C?
A. int f(); B. int (f)(); C. function int f(); D. int f(); Answer: B
Q32. What is the output of printf("%d", 5 >> 1);?
A. 2 B. 3 C. 5 D. 10 Answer: A Explanation: Right shift operator divides by 2; 5 (binary 101) shifted once becomes 2 (binary 10).
Q33. Which function is used to allocate memory and initialize it to zero in C?
A. malloc() B. calloc() C. realloc() D. free() Answer: B
Q34. Which of the following is true about recursion in C?
A. A function can call itself. B. Recursion is not allowed in C. C. Only main() can be recursive. D. Recursion requires pointers. Answer: A
Q35. Which function is used to close a file in C?
A. fclose() B. closefile() C. endfile() D. terminate() Answer: A
Q36. Which of the following is the correct format specifier for printing a float in C?
A. %d B. %f C. %c D. %lf Answer: B
Q37. What is the output of printf("%d", 3 == 3);?
A. 0 B. 1 C. True D. False Answer: B Explanation: In C, relational expressions return 1 for true and 0 for false.
Q38. Which of the following functions is used to copy one string into another in C?
A. strcpy() B. strncpy() C. strcopy() D. copystr() Answer: A
Q39. Which keyword is used to define a constant symbolic name in C?
A. const B. #define C. static D. final Answer: B
Q40. Which of the following is the correct way to declare a union in C?
A. union data { int x; float y; }; B. data union { int x; float y; }; C. declare union data { int x; float y; }; D. union { int x; float y; } data; Answer: A
Q41. Which of the following is the correct format specifier for printing a character in C?
A. %d B. %c C. %s D. %f Answer: B
Q42. What is the output of printf("%d", 4 == 5);?
A. 0 B. 1 C. True D. False Answer: A Explanation: 4 is not equal to 5, so the relational expression returns 0 (false).
Q43. Which function is used to concatenate two strings in C?
A. strcat() B. strjoin() C. stradd() D. strmerge() Answer: A
Q44. Which keyword is used to define a type alias in C?
A. typedef B. alias C. define D. struct Answer: A
Q45. Which of the following is the correct way to declare a multidimensional array in C?
A. int arr[3][3]; B. array int arr(3,3); C. int arr = [3][3]; D. declare arr[3][3] int; Answer: A
Q46. Which of the following is the correct way to declare a string in C?
A. char str[20]; B. string str[20]; C. char str = "Hello"; D. declare string str; Answer: A
Q47. What is the output of printf("%d", 10 != 5);?
A. 0 B. 1 C. True D. False Answer: B Explanation: 10 is not equal to 5, so the relational expression returns 1 (true).
Q48. Which function is used to find the length of a string in C?
A. strlen() B. strlength() C. strcount() D. strsize() Answer: A
Q49. Which keyword is used to define a constant variable in C?
A. const B. static C. define D. final Answer: A
Q50. Which of the following is the correct way to declare a pointer to an integer in C?
A. int p; B. int *p; C. pointer int p; D. int &p; Answer: B
Q51. Which of the following is the correct way to declare a function pointer in C?
A. int func(); B. int (func)(); C. function int func(); D. int func(); Answer: B
Q52. What is the output of printf("%d", 12 % 5);?
A. 2 B. 3 C. 5 D. 7 Answer: B Explanation: 12 divided by 5 leaves a remainder of 2.
Q53. Which function is used to release dynamically allocated memory in C?
A. free() B. delete() C. remove() D. release() Answer: A
Q54. Which keyword is used to declare a global variable in C?
A. global B. extern C. static D. register Answer: B
Q55. Which of the following is the correct way to declare a pointer to a structure in C?
A. struct student *s; B. student struct *s; C. struct *student s; D. pointer struct student s; Answer: A
Q56. Which of the following is the correct format specifier for printing a long integer in C?
A. %d B. %ld C. %li D. Both B and C Answer: D
Q57. What is the output of printf("%d", 15 & 7);?
A. 7 B. 15 C. 8 D. 0 Answer: A Explanation: Bitwise AND of 15 (1111) and 7 (0111) is 7 (0111).
Q58. Which function is used to read formatted input from a file in C?
A. fscanf() B. fread() C. fget() D. fscan() Answer: A
Q59. Which keyword is used to declare a variable that retains its value between function calls?
A. static B. extern C. register D. auto Answer: A
Q60. Which of the following is the correct way to declare a pointer to a float in C?
A. float p; B. float *p; C. pointer float p; D. float &p; Answer: B
Q61. Which of the following is the correct format specifier for printing a double in C?
A. %f B. %lf C. %d D. %ld Answer: B
Q62. What is the output of printf("%d", 20 >> 2);?
A. 5 B. 10 C. 20 D. 40 Answer: A Explanation: Right shift by 2 divides by 4; 20 ÷ 4 = 5.
Q63. Which function is used to reallocate memory in C?
A. malloc() B. calloc() C. realloc() D. free() Answer: C
Q64. Which keyword is used to declare a variable that is local to a block in C?
A. auto B. static C. extern D. register Answer: A
Q65. Which of the following is the correct way to declare a pointer to a character in C?
A. char p; B. char *p; C. pointer char p; D. char &p; Answer: B
Q66. Which of the following is the correct format specifier for printing an unsigned integer in C?
A. %d B. %u C. %i D. %ul Answer: B
Q67. What is the output of printf("%d", 9 | 3);?
A. 9 B. 11 C. 3 D. 12 Answer: B Explanation: Bitwise OR of 9 (1001) and 3 (0011) is 1011, which equals 11.
Q68. Which function is used to write a string to a file in C?
A. fputs() B. fwrite() C. fprintf() D. putfile() Answer: A
Q69. Which keyword is used to declare a variable that is stored in CPU registers for faster access?
A. register B. static C. auto D. extern Answer: A
Q70. Which of the following is the correct way to declare a pointer to a void in C?
A. void p; B. void *p; C. pointer void p; D. void &p; Answer: B
Q71. Which of the following is the correct format specifier for printing an unsigned long integer in C?
A. %lu B. %ld C. %u D. %d Answer: A
Q72. What is the output of printf("%d", 6 ^ 3);?
A. 5 B. 7 C. 9 D. 2 Answer: A Explanation: Bitwise XOR of 6 (110) and 3 (011) is 101, which equals 5.
Q73. Which function is used to read a character from a file in C?
A. fgetc() B. getc() C. getchar() D. Both A and B Answer: D
Q74. Which keyword is used to declare a variable that can be accessed across multiple files in C?
A. extern B. static C. global D. register Answer: A
Q75. Which of the following is the correct way to declare a pointer to a double in C?
A. double p; B. double *p; C. pointer double p; D. double &p; Answer: B
Q76. Which of the following is the correct format specifier for printing a short integer in C?
A. %d B. %hd C. %ld D. %u Answer: B
Q77. What is the output of printf("%d", ~5);?
A. -6 B. 5 C. -5 D. 6 Answer: A Explanation: Bitwise NOT inverts bits; for 5, the result is -6 in two’s complement representation.
Q78. Which function is used to write a character to a file in C?
A. fputc() B. putc() C. fprintf() D. Both A and B Answer: D
Q79. Which keyword is used to declare a variable that is local to a function in C?
A. auto B. static C. extern D. register Answer: A
Q80. Which of the following is the correct way to declare a pointer to a pointer in C?
A. int **p; B. int p; C. pointer int **p; D. int &&p; Answer: A
Q81. Which of the following is the correct format specifier for printing an unsigned short integer in C?
A. %hu B. %hd C. %u D. %d Answer: A
Q82. What is the output of printf("%d", 8 << 2);?
A. 16 B. 32 C. 8 D. 4 Answer: B Explanation: Left shift by 2 multiplies by 4; 8 × 4 = 32.
Q83. Which function is used to check the end of a file in C?
A. feof() B. eof() C. endfile() D. fileend() Answer: A
Q84. Which keyword is used to declare a variable that is volatile in C?
A. volatile B. static C. extern D. register Answer: A
Q85. Which of the following is the correct way to declare a pointer to a function returning int in C?
A. int f(); B. int (f)(); C. function int f(); D. int f();
Q86. Which of the following is the correct format specifier for printing an unsigned char in C?
A. %c B. %u C. %hhu D. %d Answer: C
Q87. What is the output of printf("%d", 7 && 0);?
A. 0 B. 1 C. True D. False Answer: A Explanation: Logical AND returns true only if both operands are non‑zero; here 7 && 0 = 0.
Q88. Which function is used to move the file pointer to a specific location in C?
A. fseek() B. ftell() C. rewind() D. movefile() Answer: A
Q89. Which keyword is used to declare a variable that cannot be modified in C?
A. const B. static C. final D. immutable Answer: A
Q90. Which of the following is the correct way to declare a pointer to a constant integer in C?
A. const int *p; B. int const *p; C. Both A and B D. int *const p; Answer: C
Q91. Which of the following is the correct format specifier for printing a long double in C?
A. %Lf B. %lf C. %f D. %ld Answer: A
Q92. What is the output of printf("%d", 0 || 1);?
A. 0 B. 1 C. True D. False Answer: B Explanation: Logical OR returns true if at least one operand is non‑zero; here 0 || 1 = 1.
Q93. Which function is used to determine the current position of the file pointer in C?
A. ftell() B. fseek() C. rewind() D. fpos() Answer: A
Q94. Which keyword is used to declare a variable that is constant and cannot be changed in C?
A. const B. static C. final D. immutable Answer: A
Q95. Which of the following is the correct way to declare a pointer to a constant pointer in C?
A. int *const p; B. const int *p; C. int const *p; D. Both A and B Answer: A
Q96. Which of the following is the correct format specifier for printing a hexadecimal integer in C?
A. %x B. %X C. Both A and B D. %h Answer: C
Q97. What is the output of printf("%d", 5 && 5);?
A. 0 B. 1 C. True D. False Answer: B Explanation: Logical AND returns true if both operands are non‑zero; here 5 && 5 = 1.
Q98. Which function is used to reset the file pointer to the beginning of a file in C?
A. rewind() B. fseek() C. ftell() D. reset() Answer: A
Q99. Which keyword is used to declare a variable that is defined only once in C?
A. static B. const C. extern D. register Answer: A
Q100. Which of the following is the correct way to declare a pointer to a constant integer pointer in C?
A. const int *const p; B. int const *const p; C. Both A and B D. int *const p; Answer: C
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