我的第三次上机实验3-3之求两点之间的距离

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
double x1,y1,x2,y2,d;
cout<<"请输入坐标值x1,y1,x2,y2";
cin>>x1>>y1>>x2>>y2;
d=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
cout<<"两点之间的距离d="<<d;
}