/****************************************

*Namc:prj1                              *
*Purpose:judge the prime number         *
*Author:Bennett                         *
*Date written:1/19/2012                 *
****************************************/
#include
#include  //C99 only
bool is_prime(int n){
    int divisor;
    
    if(n<=1)           //both 0 and 1 are not prime or composite number
    return false;
    for(divisor=2;divisor*divisor<=n;divisor++)
       {
         if(n%divisor==0)
           return false;
       }
    return true;
}
int main()
{
      int n;
      printf("Enter a number:");
      scanf("%d",&n);
      if(is_prime(n))
        printf("The number %d you input is Prime !\n",n);
      else
        printf("The number %d you input is NOT Prime !\n",n);
 
      return 0;
}