#include <iostream>

using namespace std;

class Teacher{
public:
    string name;
    string school;
    virtual void goinclass() = 0;//纯虚函数不能被实例化  抽象类
    virtual void startclass() = 0;//纯虚函数不能被实例化
    virtual void afterclass() = 0;//纯虚函数不能被实例化
};

class MathTeacher:public Teacher{
public:
    void goinclass() override
    {
        cout<<"MathTeacher goinclass"<<endl;
    }

    void startclass() override
    {
        cout<<"MathTeacher startclass "<<endl;
    }

    void afterclass() override
    {
        cout<<"MathTeacher afterclass"<<endl;
    }
};

class EnglishTeacher:public Teacher{
public:
    void goinclass() override
    {
        cout<<"EnglishTeacher goinclass"<<endl;
    }

    void startclass() override
    {
        cout<<"EnglishTeacher startclass "<<endl;
    }

    void afterclass() override
    {
        cout<<"EnglishTeacher afterclass"<<endl;
    }
};


int main()
{
    //Teacher t;  //抽象类不能被实例化
    MathTeacher r ;
    r.goinclass();

    Teacher *r1 = new EnglishTeacher;
    r1->startclass();


    return 0;
}