实验五：类的继承，派生和多态（2）

#include<iostream>
#include<string>
#include<cstdlib>
using namespace std;

#ifndef MACHINEPETS_H
#define MACHINEPETS_H

class MachinePets
{
    public:
        MachinePets(const string s);
        virtual string talk() const=0;
        string getNickname();
        virtual ~MachinePets(); 
    
    private:
        string nickname;
};

#endif

MachinePets::MachinePets(const string s):nickname(s)
{ }

string MachinePets::getNickname()
{
    return nickname;
}

MachinePets::~MachinePets()
{ }


#ifndef PETCATS_H
#define PETCATS_H

class PetCats:public MachinePets
{
    public:
        PetCats(const string s);
        string talk() const;
        ~PetCats();
};

#endif

PetCats::PetCats(const string s):MachinePets(s)
{ }

string PetCats::talk() const
{
    cout<<"words:";
    return "wu~";
}

PetCats::~PetCats()
{ }


#ifndef PETDOGS_H
#define PETDOGS_H

class PetDogs:public MachinePets
{
    public:
        PetDogs(const string s);
        string talk() const;
        ~PetDogs();
};

#endif

PetDogs::PetDogs(const string s):MachinePets(s)
{ }

string PetDogs::talk() const
{
    cout<<"words:";
    return "wang wang~";
}

PetDogs::~PetDogs()
{ }


void play(MachinePets *pet)
{
    cout<<pet->getNickname()<<"says"<<pet->talk()<<endl;
}

int main()
{
    PetCats cat("miku");
    PetDogs dog("dahuang");
    
    play(&cat);
    play(&dog);

    return 0;
}