4/23 c++練習四

#include <stdio.h>
#include <stdlib.h>
int main(void)
{
   int x;
   int check();
   printf("請輸入一個數字\n");
   scanf("%d",&x);
   if (check(x)==0)
   {
              printf("x=%d\n為質數\n",x);
   }
else
   {
              printf("x=%d\n非質數\n",x);
    }

printf("============================\n");


    system("pause");
    return 0;
}
int check(int a)

{
    int i,count=0;
    for(i=2;i<a;i++)
    {
                    if (a%i==0)
                    {
                       count=count+1;
                    }

    }


    return(count);

}