程序代码：

#include<iostream>
#include<cassert>
using namespace std;
class point{
public:
    point(int xx = 0, int yy = 0)
    {
        x = xx;
        y = yy;

    }
    point(point &a);
    int getX(){
        return x;
    }
    int getY()
    {
        return y;

    }
    void move(int newX, int newY){
        x = newX;
        y = newY;
        cout << getX() << "," << getY() << endl;
    }
private:
    int x, y;
};
class arrayofpoints{
public:
    arrayofpoints(int size) : sizes(size){
        points = new point[size];
    }
    ~arrayofpoints(){
        cout << "deleteing..." << endl;
        delete[] points;
    }
    point& element(){

        return *(points++);//一改这里能运行但是最后说了句debug assertion failed! 我输入了3或者4 
    }
private:
    point *points;
    int sizes;
};
int main()
{
    int count;
    cout << "please enter the count of points: ";
    cin >> count;
    arrayofpoints Points(count);
    
    Points.element().move(12, 56);
    Points.element().move(5, 0);
    return 0;
}