用C++编写一个程序,计算直角坐标系中点a(x0,y0)到点b(x1,y1)的距离

Answer 1

#include <map>
#include <cmath>
#include <iostream>

int main() {
    std::multimap<double,double> point;

    point.insert(std::pair<double,double>(0.0,0.0));
    point.insert(std::pair<double,double>(3.0,4.0));

    double dist_x = 0.0;
    double dist_y = 0.0;
    
    for ( std::multimap<double,double>::iterator it=point.begin(); it != point.end(); ++it ) {
        dist_x += it->first * it->first;
        dist_y += it->second * it->second;
    }
    std::cout << "Distance = " << sqrt(dist_x + dist_y) << std::endl;
}