求10000以内的质数

#include
int main()
{
     int i,j,m,n;
     printf("10000以内的质数为: \n");
     for (m=1;m<=10000;m++)
     {
          n=sqrt(m);
          for(i=2;i<=n;i++)
           if(m%i==0)
           break;
           if(i>n)
           {
               printf("%d\t",m);
               j++;
               if(j%5==0)
                printf("\n");

           }
     }
     getchar();
     return 0;

}