Frequently Asked Top 20 C programs in Interview

Frequently Asked C Programs

Here You Can get Frequently asked C programs in the interview. These programs can be asked from Basic C language, array, string, pointer, linked list, file handling etc. Let us Learn the list of c programs.

1) Fibonacci Series

Write a program in C Language to print fibonacci series without using recursion and using recursion.
Input: 10
Output: 0 1 1 2 3 5 8 13 21 34

2) Prime number

Write a program in C Language to check prime number.
Input: 44
Output: not prime number
Input: 7
Output: prime number

3) Palindrome number

Write a Program in c Language to check palindrome number.
Input: 329
Output: not palindrome number
Input: 12321
Output: palindrome number

4) Factorial

Write a Program in C language to print factorial of a number.
Input: 5
Output: 120
Input: 6
Output: 720

5) Armstrong number

Write a program in C language to check armstrong number.
Input: 153
Output: armstrong
Input: 22
Output: not armstrong

6) Sum of Digits

Write a program in C language to print sum of digits.
Input: 234
Output: 9
Input: 12345
Output: 15

7) Reverse Number

Write a program in C language to reverse given number.
Input: 123
Output: 321

8) Swap two numbers without using third variable

Write a program to swap two numbers without using third variable.
Input: a=10 b=20
Output: a=20 b=10

9) Print “hello” without using semicolon

Write a program in C language to print “hello” without using semicolon

10) Assembly Program in C

Write a program in C language to add two numbers using assembly code.

11) C Program without main() function

Write a program in C to print “Hello” without using main() function.

12) Matrix Multiplication

Write a program In C language to print multiplication of 2 matrices.
Input:
first matrix elements:
1 1 1
2 2 2
3 3 3
second matrix elements
1 1 1
2 2 2
3 3 3
Output:
multiplication of the matrix:
6 6 6
12 12 12
18 18 18

13) Decimal to Binary

Write a program in C language to convert decimal number to binary.
Input: 5
Output: 101
Input: 20
Output: 10100

14) Alphabet Triangle

Write a program in C language to print alphabet triangle.
Output:
     A
ABA
ABCBA
ABCDCBA
ABCDEDCBA

15) Number Triangle

Write a program in C language to print number triangle.
Input: 7
Output:
enter the range= 6
1
121
12321
1234321
123454321
12345654321

16) Fibonacci Triangle

Write a program in C language to generate fibonacci triangle.
Input: 5
Output:
1
1 1
1 1 2
1 1 2 3
1 1 2 3 5

17) Number in Characters

Write a program in C language to convert number in characters.
Input: 5
Output: five
Input: 203
Output: two zero three

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