程序代码：

//类定义
class Point
{
public:
    Point(int x=0,int y=0):x(x),y(y) {}
    Ponit(const Point &p);
    ~Point() {count--;}
    int getx()  const {return x;}
    int gety()  const {return y;}
    static void showcount();
private:
    int x,y;
    static int count;
};

//类实现
#include"Point.h"
#include<iostream>
using namespace std;

int Point::count=0;
Point::Ponit(const Point &p):x(p.x),y(p.y)
{
    count++;
}

void Point::showcount()
{
    cout<<"Objiect count="<<count<<endl;
}

//主函数
#include"Point.h"
#include<iostream>
using namespace std;


int main()
{
    Point a(4,5);
    cout<<"Point A:"<<a.getx()<<","<<a.gety();
    Point::showcount();

    Point b(a);
    cout<<"Point B:"<<b.getx()<<","<<b.gety();
    Point::showcount();

    return 0;
}