实验5

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

//抽象类 MachinePets 
class MachinePets{
     public:
         MachinePets();
         MachinePets(const string s){
             nickname=s;
         }
        virtual string talk() {    // 纯虚函数 
        return 0;
    }
    string getnickname()const {
        return nickname;   
    }
     private:
        string nickname;
};

// 派生类 PetCats 公有继承自类 MachinePets
class PetCats:public MachinePets {
     public:
       PetCats(const string s):MachinePets(s) {

    }
        string talk(){
            return "says miao wu^";
        }
};

// 派生类 PetDogs 公有继承自类 MachinePets
class PetDogs:public MachinePets{
     public:
        PetDogs(const string s):MachinePets(s) {

    }
        string talk(){
            return "says wang wang^" ;
        }
};

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


// 主函数
int main() {
     PetCats cat("miku");
     PetDogs dog("da huang");
     play(&cat); // 按照play()形参，传递参数
     play(&dog); // 按照play()形参，传递参数
     return 0; 
}