#include <iostream.h>
#include <math.h>
class line;							//类的声明
class point							//类point
{
private:
	int x;int y;
public:
	point(int a,int b) 				//构造函数
	{
		x=a;y=b;
	}
	void print(line &);				//成员函数
};
class line
{
private:
	int x1, y1;
	int x2, y2;
public:
	line(int a,int b,int c,int d) 	//构造函数
	{
		x1=a;x2=b;
		y1=c;y2=d;
	}
	friend void point::print(line &);	//声明友元成员
};
void point::print(line &p)	//友元成员定义实现对line类的数据成员的访问
{
	cout<<x<<y<<endl;
	cout<<p.x1<<p.x2<<p.y1<<p.y2<<endl;
}
void main()
{
	point A(7,8); 						//定义对象
	line l(1,2,3,4);				 	//定义对象
	A.print(l);
}