c8_3.c

适合于初学者的C程序

/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{
  int prime(int);
  int n;
  printf("\ninput an integer:");
  scanf("%d",&n);
  if(prime(n))
  printf("\n %d is a prime.\n",n);
  else
  printf("\n %d is not a prime.\n",n);  
}
int prime(int n)
{
	int flag=1,i;
	for(i=2;i<n/2&&flag==1;i++)
	if(n%i==0)
	flag=0;
	return(flag);
}