C Program to check whether a number is Prime OR Composite

This is a basic program in c which checks whether the number is prime number or composite number.

PROGRAM :

#include <stdio.h>
#include <stdlib.h>

int main()
{
   int a, b;

   printf("Enter a number to check Prime or Composite \t");
   scanf("%d",&b);

    if (b == 0 || b ==1)
        printf("%d is neither Prime nor Composite",b);

    for ( a = 2 ; a <= b-1 ; a++ )
    {
      if ( b%a == 0 )
      {
         printf("%d is Composite number\n", b);
         break;
      }
    }
    if ( b == a )
      printf("%d is Prime number \n", b);
    return 0;
}

OUTPUT:

C - Prime or Composite