C++ object pointer practice

1. The topic is as follows:

2. Come on, show:

Coordinate.h

class Coordinate
{
public:
   Coordinate();
   ~Coordinate();
public:
    int m_iX;
    int m_iY;
};

Coordinates.cpp

#include <iostream>
#include "Coordinate.h"
using namespace std;

Coordinate::Coordinate()
{
    cout << "Coordinate" << endl;
}

Coordinate::~Coordinate()
{
    cout << "~Coordinate" << endl;
}

demo.cpp

#include <iostream>
#include "Coordinate.h"
#include <stdlib.h>
using namespace std;

int main(void)
{
    //从堆中实例化
    Coordinate *p1 = NULL;
    p1 = new Coordinate;
    Coordinate *p2 = new Coordinate();
    p1->m_iX = 10;
    p1->m_iY = 20;
    (*p2).m_iX = 30;
    (*p2).m_iY = 40;
    cout << p1->m_iX + (*p2).m_iX << endl;
    cout << p1->m_iY + (*p2).m_iY << endl;
    delete p1;
    p1 = NULL;
    delete p2;
    p2 = NULL;

    system("pause");
    return 0;
}

3. The running results are as follows:

4. Note that we instantiate objects from the heap and need to be destroyed last

5.//Instantiate from the stack

//Operate p1 through p2

//从栈中实例化
    Coordinate p1;
    //通过p2操作p1
    Coordinate *p2 = &p1;

    p2->m_iX = 10;
    p2->m_iY = 20;
    (*p2).m_iX = 10;

    cout << p1.m_iX << endl;
    cout << p1.m_iY << endl;

6. The running results are as follows:

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C++ object pointer practice

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