hypot()

计算两点之间的距离

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
     //计算两点之间的距离
    double x1,y1,x2,y2;
    cout<<"please input the two point:"<<endl;
    cin>>x1>>y1>>x2>>y2;
    cout<<hypot((x2-x1),(y2-y1))<<endl;
    
}