hdu-2001 计算两点间的距离

注意格式化输出

#include <iostream>#include <cstdio>#include <cmath>using namespace std;int main(){    double x1,y1,x2,y2;    while(cin>>x1>>y1>>x2>>y2)        printf("%.2lf\n",sqrt(pow(x1-x2,2)+pow(y1-y2,2)));    return 0;}