#include <math.h>
   {    int prim( int x )
        int i,glag;
        flag=1;
        i=2;
        while(i<(int sqrt(x)&&flag)
         {   if(x%i==0)
             flag=1;
             else ++i;
         }
           return flag;
   }
      main()
     {    int y,s;
          printf(" \n Please input a num:");
          scanf("%d",&y);
           y=prim(y);
         if(y=1)  printf("%d is prime num");
         else printf("%d isn't prime num");
      }



请指教这个程式的第二行怎么错了！ TC上显示 Delearation.......  谢谢！

麻烦给添以下，我添了可是不对啊! 谢谢！

谢谢，知道了！

#include <math.h>
       int prim( int x );
      { int i,glag;
        flag=1;
        i=2;
        while(i<(int sqrt(x)&&flag)
         {   if(x%i==0)
             flag=1;
             else ++i;
         }
           return flag;
      }
      main()
     {    int y,s;
          printf(" \n Please input a num:");
          scanf("%d",&y);
           y=prim(y);
         if(y=1)  printf("%d is prime num");
         else printf("%d isn't prime num");
      }
是这样吗？ 好像还不对啊！

对啊！请帮我看看到底咋搞得，多谢高手！最好帮我修改一下，好让我心里清楚。