HDU 2001 计算两点间距离

Posted 2020-07-19

由四个实数组成的坐标，全部变量用double，刚开始用整数没过

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



int main()
{
        double a,b,c,d;
        double r;
        while(scanf("%lf%lf%lf%lf",&a,&b,&c,&d)!=EOF)
        {
                r=sqrt((a-c)*(a-c)+(b-d)*(b-d));
                printf("%.2f\n",r);
        }
        return 0;
}