实验五

#include<iostream>
#include<string>
using namespace std;
//抽象类MachinePets 
class MachinePets{
    public:
        MachinePets(){}
        MachinePets(const string s):nickname(s){}
        virtual string talk()=0;//纯虚函数 
        string getNickname()const{
        return nickname;
        }
    private:
        string nickname;
};

//派生类PetCats公有继承MachinePets 
class PetCats:public MachinePets{
    public:
        PetCats(){}
        PetCats(const string s1):MachinePets(s1){}
        string talk(){
            return "miaomiao~";
        }
};

//派生类PetDogs公有继承MachinePets
class PetDogs:public MachinePets{
    public:
        PetDogs(){}
        PetDogs(const string s2):MachinePets(s2){}
        string talk(){
            return "wangwang~";
        }
}; 
//接口函数，用于打印出宠物及它的叫声 
void play(MachinePets *m){    
    cout <<m->getNickname() << " says " << m->talk() << endl;
}

int main(){
    PetCats cat("miku");
    PetDogs dog("da huang");
    play(&cat);
    play(&dog);
    return 0;
}