Commonly used C programs :

1. Write a C program to find whether the number is PRIME number or not.

2.Write a C program to find whether the number is EVEN or ODD.

3.Write a C program to find the SIZE of the different data types.

4.Write a C program to find the MAX and MIN number.

5.Write a C program to find whether the number is ARMSTRONG number or not.

6.Write a C program to find whether the number is PERFECT number or not