作业 4.22

#include<iostream>#include<cmath>using namespace std;class point{private:int x;int y;public:point(int a,int b){x=a;    y=b;}void show();friend void dist(point& a,point& b);};void point::show(){cout<<"输出该点坐标:"<<"("<<x<<","<<y<<")"<<endl;}void dist(point& a,point& b){double d=sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));cout<<"两点间的距离:"<<d<<endl;}int main(){    point p1(4,5);p1.show();point p2(7,8);p2.show();dist(p1,p2);return 0;}