#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;
}