C Programs Mostly Asked interview Questions and answers

1. Write a c program to check given number is perfect number or not.

2. Write a c program to check given number is Armstrong number or not.

3. Write a c program to check given number is prime number or not.

4. Write a c program to check given number is strong number or not.

5. C program to check a number is odd or even.

6. Write a c program to check given number is palindrome number or not.

8. Write a c program to check given string is palindrome number or not.
7. Write a c program to solve quadratic equation.
8.  Write a c program to print Fibonacci series of given range.
9. Write a c program to get factorial of given number.

10. Write a c program for Floyd’s triangle.

11. Write a c program to print Pascal triangle.

12. Write a c program to generate multiplication table. 13. Write a c program to print ASCII value of all characters. 14. C program to print hello world without using semicolon 15. Write a c program which produces its own source code as its output.

16.Write a c program to reverse any number.
17. Write a c program to find out sum of digit of given number.

18. Write a c program to find out power of number.          

19. Write a c program to add two numbers without using addition operator.

20. Write a c program to subtract two numbers without using subtraction operator.

21. Write a c program to find largest among three numbers using binary minus operator.  22. Write a c program to find largest among three numbers using conditional operator

23. Write a c program to find out generic root of any number.

24. Write a c program to find out prime factor of given number.

25. Write a c program to find out NCR factor of given number.
26. How to convert string to int without using library functions in c
27. Program in c to print 1 to 100 without using loop
28. C program for swapping of two numbers
29. Program to find largest of n numbers in c
30. Split number into digits in c programming
31. C program to count number of digits in a number

32. Write a c program to swap two numbers.

33. Write a c program to swap two numbers without using third variable.

34. Write a c program for swapping of two arrays.

35. Write a c program for swapping of two string.

36.Write a c program for swapping generic.(eg: if one array have size and second array size equal or may not then you need to swap the array) .

38. Write a c program to convert decimal number to binary number.

39. Write a c program to convert decimal number to octal number.
40. Write a c program to convert decimal number to  hexadecimal number.
41. Write a c program to convert octal number to binary number.

42. Write a c program to convert octal number to decimal number.

43. Write a c program to convert octal number to hexadecimal number.

44. Write a c program to convert hexadecimal number to binary number.

45. Write a c program to convert hexadecimal number to octal number.
46. Write a c program to convert hexadecimal number to decimal number.
47. Write a c program to convert binary number to octal number.

48. Write a c program to convert binary number to decimal number.

49. Write a c program to convert binary number to hexadecimal number.
50. C program for addition of binary numbers . 

51. Write a c program to convert the string from upper case to lower case.or lower case to upper case.

52. Write a c program to delete the all consonants from given string.

53. Write a c program to count the different types of characters in given string.

54.  Write a c program to sort the characters of a string.

55. Write a c program for concatenation two strings without using string.h header file.

56. Write a c program to find the length of a string using pointer.  

57. Write a c program which prints initial of any name.

58. Write a c program to print the string from given character.
59. Write a c program to reverse a string
60. Reverse a string using recursion in c
61. String concatenation in c without using strcat
62. How to compare two strings in c without using strcmp
63. String copy without using strcpy in c
64. Convert a string to ASCII in c

65.Write a c program to reverse a string using recursive.

66. Write a c program to find out largest element of an array.

67. Write a c program to find out second largest element of an unsorted array.

68. Write a c program to find out second smallest element of an unsorted array.

69. Write a c program which deletes the duplicate element of an array.

70. Write a c program for delete an element at desired position in an array.

71. Write a c program for insert an element at desired position in an array.
72. C program to find largest and smallest number in an array

73.Write a c program to find the size of int without using sizeof operator.

74. Write a c program to find the size of double without using sizeof operator.     

75. Write a c program to find the size of structure without using sizeof operator.

76. Write a c program to find the size of union without using sizeof operator.

77.Write a c Program to Print Prime numbers range between 1 to 1000.

78.Write a c program to sum of first 100 prime numbers and print its output.

79.Write a c program to multiply integer with float value but without using Float datatype.

80.Write a c program to accept a two values in main function and call function for one single call return two values sum and product into main and print in main function.

 

I will post some more program this are the basic programs mostly asked in interview