c++-zoo动物园

面向对象抽象类写动物园

animal

animal.h

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

class Animal
{
public:
	//纯虚函数，让子类继承并且实现
	virtual void voice() = 0;
	Animal();
	virtual ~Animal();
};


//架构函数
//让动物叫
void letAnimalCry(Animal *animal);

animal.cpp

#include "Animal.h"

Animal::Animal()
{
	cout << "animal().." << endl;
}
Animal::~Animal()
{
	cout << "~Animal()..." << endl;
}

void letAnimalCry(Animal *animal)
{
	animal->voice();

	if (animal != NULL) {
		delete animal;
	}
}

dog

dog.h

#pragma once
#include "Animal.h"
class Dog : public Animal
{
public:
	Dog();
	~Dog();

	virtual void voice();
};

dog.cpp

#include "Dog.h"


Dog::Dog()
{
	cout << "Dog().." << endl;
}


Dog::~Dog()
{
	cout << "~Dog().." << endl;
}

void Dog::voice()
{
	cout << "¹·¿ªÊ¼¿ÞÁË£¬ 555" << endl;
}

cat

cat.h

#pragma once
#include "Animal.h"


class Cat : public Animal
{
public:
	Cat();
	~Cat();

	virtual void voice();
};

cat.cpp

#include "Cat.h"


Cat::Cat()
{
	cout << "cat().." << endl;

}


Cat::~Cat()
{
	cout << "~cat().." << endl;

}

void Cat::voice()
{
	cout << "小猫开始哭了，66666" << endl;
}

main

main.cpp

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include "Animal.h"
#include "Dog.h"
#include "Cat.h"


using namespace std;

int main(void)
{
	letAnimalCry(new Dog);

	letAnimalCry(new Cat);

#if 0
	Animal *dog = new Dog;
	letAnimalCry(dog);
	delete Dog;
#endif

	return 0;
}