#include<stdio.h>
int main()
{
    int a,b,y;
    y=0;
    for(a=2;a<100;a++)
    {
         y=0;
         for(b=2;b<a;b++)
         {
               if(a%b==0)
               y=1;
               break;               
         }
         if(a>2&&y==0)
         printf(" %d",a);                 
    }
    getch();
    return 0;  
}
为什么输出不对啊