计划不如变化、学 C++

C++中的传递引用 与 返回引用：

#include <iostream>
#include "Point.cpp"


Point &F(Point &p);

int main()
{
    Point p(3, 5);

    std::cout << "X: " << p.GetX() << " Y: " << p.GetY() << std::endl;

    p.AddX();
    p.AddY();

    std::cout << "X: " << p.GetX() << " Y: " << p.GetY() << std::endl;


    Point &p2 = F(p);

    std::cout << "X: " << p.GetX() << " Y: " << p.GetY() << std::endl;
    
    std::cout << "p2.X: " << p2.GetX() << " p2.Y: " << p2.GetY() << std::endl;

    p2.AddX();
    p2.AddY();

    std::cout << "X: " << p.GetX() << " Y: " << p.GetY() << std::endl;

    int x;
    std::cin>> x;

    return 0;
}

Point &F(Point &p)
{
    p.AddX();
    p.AddY();
    return  p;
}

Point.cpp 

#include <iostream>

class Point
{
private :
    int mX, mY;


public:

    Point(int x,int y)
    {
        mX = x;
        mY = y;
    }

    int GetX()
    {
        return mX;
    }

    int GetY()
    {
        return mY;
    }

    void AddX()
    {
        mX++;
    }
    void AddY()
    {
        mY++;
    }

};

运行结果：