【杭电】[2001]计算两点间的距离

还是用这种吧……

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