m0_47491309的博客

//person.h#ifndef PERSON_H#define PERSON_H#include<string>using namespace std;class Person{protected: string name; int id; string gender;public: virtual void input(){} virtual void output(){}//此处写了分号，后面就要再定义写成{}，这样才有函数体}

//bird.h#ifndef BIRD_H#define BIRD_H#include<vector>using namespace std;class bird{public: virtual void fly()=0;};class WildGoose: public bird{public: virtual void fly();};class Parrot: public bird{public: virtual void fly