【杭电2001】计算两点间的距离

公式题

#include<stdio.h>#include<math.h>#define PI 3.1415927int main() {    double i,j,k,n;    while(scanf("%lf %lf %lf %lf",&i,&j,&k,&n)!=EOF)    {        printf("%.2f\n",pow(pow(k-i,2)+pow(n-j,2),0.5));    }    return 0;}

http://acm.hdu.edu.cn/showproblem.php?pid=2001