C++第四次作业

#include <iostream>#include <string>using namespace std;class Person{public:    Person(string s){        name=s;    }    void display( ){        cout<<"Name: "<<name<<endl;    }private:    string name;};class Student:public Person//(1){public:    Student(string s, int g):Person(s)// (2)参考教材P169加底纹部分    {grade=g;}    void display1( ) {        display();   //  (3)        cout<<"Grade: "<<grade<<endl;    }private:    int grade;};int main( ){    Student s("龙三",19);    s.display1(  );       //  (4)    return 0;}