void main()
{
    int low,high,t=0;
    printf("請輸入你想尋找素數的范圍(例如10~100，輸入10 100)/n");
    scanf("%d %d",&low,&high);
    if(low>high||low<0)
        printf("你所輸入的數據有誤！");
    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);//一位數與兩位數的對齊
                t++;
                if(t%4==0)//沒四個為一組，換行操作
                    printf("/n");
            }
        }
        if(t==0)
            printf("您所輸入的范圍沒有素數/n");
        printf("/n");
    }
}