//6_14.cpp
#include <iostream>
using namespace std;
class Point	//Point類聲明
{
public:	//外部接口
	Point(int xx=0, int yy=0) {X=xx;Y=yy;countP++;}	//構(gòu)造函數(shù)
	Point(Point &p);	//拷貝構(gòu)造函數(shù)
	int GetX() {return X;}
	int GetY() {return Y;}

	static int countP;	//靜態(tài)數(shù)據(jù)成員引用性說明
private:	//私有數(shù)據(jù)成員
	int X,Y;
};
Point::Point(Point &p)
{
	X=p.X;
	Y=p.Y;
	countP++;
}

int Point::countP=0;	//靜態(tài)數(shù)據(jù)成員定義性說明

void main()	//主函數(shù)實(shí)現(xiàn)
{
	int *count=&Point::countP;              //聲明一個(gè)int型指針，指向類的靜態(tài)成員
	Point A(4,5);	//聲明對象A
	cout<<"Point A,"<<A.GetX()<<","<<A.GetY();
	cout<<" Object id="<<*count<<endl;	//直接通過指針訪問靜態(tài)數(shù)據(jù)成員
	Point B(A);	//聲明對象B
	cout<<"Point B,"<<B.GetX()<<","<<B.GetY();
	cout<<" Object id="<<*count<<endl; 	//直接通過指針訪問靜態(tài)數(shù)據(jù)成員
}