#include <stdio.h>
#include <math.h>

 

void main()
{
    int low,high,t=0;
    printf("请输入你想寻找素数的范围(例如10~100，输入10 100)\n");
    scanf("%d %d",&low,&high);
    if(low>high||low<0)
        printf("你所输入的数据有误！");
    else
    {
        for(;low<=high;low++)
        {
            if(low==1||low==0)
                continue;
            int j=0;
            for(int i=2;i<=sqrt(low);i++)
            {
                if(low%i==0)
                {
                    j=1;
                    break;
                }
            }
            if(j==0)
            {
                if(low<10)
                    printf("%d  ",low);
                else
                    printf("%d ",low);//一位数与两位数的对齐
                t++;
                if(t%4==0)//没四个为一组，换行操作
                    printf("\n");
            }
        }
        if(t==0)
            printf("您所输入的范围没有素数\n");
        printf("\n");
    }
}