#include<stdio.h>
#include<math.h>
void main()
{
    int i,j=0,n=0,K;
    for (i=1;i<=99;i++,i++)
    {
        j=sqrt (i);
        for (K=2;K<=j;K++)
       {
            if (i%K==0)
                break;
        }
        if (K>=j)
        {
                printf("%-4d ",i);
                n++;
        }
                if(n%6==0)
                printf("\n");
    }
 }  

[此贴子已经被作者于2017-11-6 23:48编辑过]

        //if (K>=j)
        if (K>j)

谢谢了。