Композиция классов

Помогите дописать, не знаю как дальше. Нужно ещё создать 3-ий класс(GroupJournal), который содержит объекты других классов и выводит: nameOfst, groupName,name(предмета), missedClasses и перегрузить операторы, которые необходимы в классах. STL библиотеки не использовать.

#include <iostream>

using namespace std;

class Subject
{
private:
int numberOfclasses;
string name, lector, isAlt;

public:
Subject() 
{
    cout << "Last entry" << endl << endl;

}
void SetSubject()
{
    cout << "Add a note about subject" << endl << endl;

    cout << "Enter the name of the subject - " << endl;
    cin >> name;
    cout << "Enter the number of classes for this subject - " << endl;
    cin >> numberOfclasses;
    cout << "Alternative or basic - " << endl;
    cin >> isAlt;
    cout << "Lector of this subject - " << endl;
    cin >> lector;
    cout << endl;
}
void PrintSubject()
{
    cout << "Subject: " << name << '\n';
    cout << "Alternative or basic: " << isAlt << "\n";
    cout << "Number of classes: " << numberOfclasses << " classes" << endl;
    cout << "Lector of this subject: " << lector << endl << endl;
    cout << "==========================================" << endl;
}

int GetnumberOfclasses()
{
    return numberOfclasses;
}
string GetName()
{
    return name;
}
string GetisAlt()
{
    return isAlt;
}

~Subject() {
}
};

 class StudentAttendance
{
   private:
  int classesAttended, missedClasses;
  string nameOfst;
  string groupName;
 public:


void SetAttendance()
{
    cout << "Enter the student's first and last name -  " << endl;
    cin >> nameOfst;
    cout << "Enter the name of the group -  " << endl;
    cin >> groupName;
    cout << "Enter the number of classes attended by this student - " << endl;
    cin >> classesAttended;
    cout << "Enter the number of missed classes by this student - " << endl;
    cin >> missedClasses;

    cout << endl;
}
void PrintAttendance()
{
    cout << "Full name of student: " << nameOfst << '\n';
    cout << "Student group name: " << groupName << '\n';
    cout << "Classes attended: " << classesAttended << "\n";
    cout << "Missed classes: " << missedClasses << endl << endl;
    cout << "==========================================" << endl;
}

string GetGroupName()
{
    return groupName;
}
int GetClassesAttended()
{
    return classesAttended;
}
int GetMissedClasses()
{
    return missedClasses;
}
string GetNameOfst()
{
    return nameOfst;
}
~StudentAttendance() {
}
};

 class GroupJournal : public Subject, StudentAttendance
 {
 private:
 string nameOfst, subject, missedClasses;
 public:









};


int main()
{
 Subject x;
 x.SetSubject();
 x.PrintSubject();

 StudentAttendance y;
 y.SetAttendance();
 y.PrintAttendance();

GroupJournal z;


system("pause");
return 0;
}