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¿þá룬 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;
}