C++ 多态(一)

Bird.h

#pragma once
#include<iostream>
using namespace std;

class Bird
{
public:
	Bird();
	~Bird();
	virtual void Eat();
};

Bird.cpp

#include "stdafx.h"
#include "Bird.h"

Bird::Bird()
{
}

Bird::~Bird()
{
}

//吃方法
void Bird::Eat()
{
	cout << "我是一只鸟,我喜欢吃虫子" << endl;
}



Magpie.h

#pragma once
#include "Bird.h"

class Magpie:public Bird
{
public:
	Magpie();
	~Magpie();
	void Eat();
};

Magpie.cpp

#include "stdafx.h"
#include "Magpie.h"

Magpie::Magpie()
{
}


Magpie::~Magpie()
{
}

void Magpie::Eat()
{
	cout << "我是一只喜鹊,我喜欢吃虫子" << endl;
}



Eagle.h

#pragma once
#include "Bird.h"
class Eagle:public Bird 
{
public:
	Eagle();
	~Eagle();
	void Eat();
};

Eagle.cpp

#include "stdafx.h"
#include "Eagle.h"

Eagle::Eagle()
{
}

Eagle::~Eagle()
{
}

void Eagle::Eat()
{
	cout << "我是一只老鹰,我喜欢吃肉" << endl;
}


Main文件:

#include "stdafx.h"
#include "Bird.h"
#include "Magpie.h"
#include "Eagle.h"
#include <iostream>
using namespace std;

int main()
{
	Bird *b;
	Bird bd;
	b = &bd;
	b->Eat();

	Magpie m;
	b = &m;
	b->Eat();
	
	Eagle e;
	b = &e;
	b->Eat();

	int i = 0;
	cin >> i;
    return 0;
}

运行结果:




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