求解三维空间的两点间的距离

//此代码是求解三维空间的两点间的距离，#include "stdafx.h"#include<iostream>#include<string.h>#include<stdio.h>#include<math.h>#include <conio.h>class point{double x, y,z;public:point(double i,double j,double n) {x=i;y=j;z=n;}double getx() {return x;}double gety() {return y;}double getz() {return z;}void dispy(){std::cout<<"("<<x<<","<<y<<","<<z<<")"<<std::endl;}};double distance(point &p1,point &P2,point &P3){double d;d=sqrt((p1.getx()-P2.getx())*(p1.getx()-P2.getx())+(p1.gety()-P2.gety())*(p1.gety()-P2.gety())+(p1.getz()-P2.getz())*(p1.getz()-P2.getz()));return d;}int _tmain(int argc, _TCHAR* argv[]){point p1(2,2,3),p2(5,5,6),p3(4,5,6);p1.dispy();std::cout<<"与";p2.dispy();std::cout<<"之间的距离="<<distance(p1,p2,p3)<<std::endl;getch();return 0;}