prog6.cpp

C++语言程序设计题典

#include <iostream.h>
#include <math.h>
class Point
{
	int x,y;
public:
	Point(int i,int j) { x=i;y=j; }
    friend float distance(Point &p1,Point &p2);
	void disp()
	{
		cout << "(" << x << "," << y << ")";
	}
};
float distance(Point &p1,Point &p2)        //友元函数的实现
{
	float d;
	d=sqrt((p1.x-p2.x)*(p1.x-p2.x)+
		(p1.y-p2.y)*(p1.y-p2.y));
	return d;
}
void main()
{
	Point p1(2,2),p2(5,5);
    p1.disp();cout << "与";p2.disp();
	cout << "之间距离=" << distance(p1,p2) << endl;
}