#include <iostream>using namespace std;class Stu{    public:      Stu (int n,string nam);      void display();    protected:      int num;  //学号      string name; //姓名};Stu::Stu(int n,string nam ){    num=n;    name=nam;}void Stu::display(){    cout<<"学号："<<num<<endl;    cout<<"姓名："<<name<<endl;}class StuDetail:public Stu{    public:      StuDetail(int n,string nam,int a,string ad,int n1,string nam1);      void show(); //成员函数，输出学生的信息      void show_monitor();  //成员函数，输出班长的信息    private:      Stu monitor;  //学生所在班的班长，班长是学生，是stu类的成员      int age;  //学生年龄      string addr;  // 学生的住址};StuDetail::StuDetail(int n,string nam,int a,string ad,int n1,string nam1):    Stu(n,nam),monitor(n1,nam1),age(a),addr(ad){};void StuDetail::show(){    cout<<"学生信息："<<endl;    cout<<"学号："<<num<<endl;    cout<<"姓名："<<name<<endl;    cout<<"年龄："<<age<<endl;    cout<<"住址："<<addr<<endl;}void StuDetail::show_monitor(){    cout<<"班长信息："<<endl;    monitor.display();}int main(){    StuDetail s(10010,"wangli",19,"115 Beijing Road,shanghai",10001,"li-sun");    s.show();    s.show_monitor();    return 0;}