Instrument类的定义: class Instrument public void playo i cout<< instrument play<<endl Wind类的定义: class Wind: public Instrument public void play()∥改写基类的 Playa函数 i cout<< wind play?<<endl;Instrument类的定义： class Instrument { }; public: void play() { cout<<“instrument play”<<endl; } Wind类的定义： class Wind:public Instrument { }; public: void play() //改写基类的play()函数 { cout<<“wind play”<<endl; }