student.h

it is a usefull thing

//=====================================
// student.h
//=====================================
#include<iostream>
using namespace std;
//-------------------------------------
class Student{
  const int id;
public:
  Student(int d):id(d){ cout<<"student\n"; }
  void print(){ cout<<id<<"\n"; }
};//-----------------------------------
class Tutor{
  Student s;
public:
  Tutor(Student& st):s(st){ cout<<"tutor\n"; s.print(); }
};//-----------------------------------