2001.cpp

杭电 acm部分代码 有兴趣的可以下载 谢谢

#include<stdio.h>
#include<math.h>
int main()
{
    double x1,y1,x2,y2;
    while(scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2)!=EOF){
        if(x1==x2&&y1==y2)
            return 0;
        else
            printf("%.2lf\n",hypot(fabs(x1-x2),fabs(y1-y2)));
    }
}