наследование в классах

/
 
#include "stdafx.h"
#include "stdio.h"
#include <time.h> 
#include <stdlib.h>
 
class Base
{
private : 
    int year;
public :
    char* institute;
    Base();
    Base(const Base& b);
    ~Base();
 
 
};
class student : public Base
{
    int rating;
public :
    student();
   ~student();
};
class teacher : public Base
{
     int number_of_student;
public :
    teacher();
    ~teacher();
 
};
class doc : public Base
{
    int time;
public :
    doc();
 ~doc();
};
 
class Head_of_the_faculty : public Base
{
    double money;
public :
   Head_of_the_faculty();
   ~Head_of_the_faculty();
};
 
/////////////////////////////////////////////////////////////////////////////////////////
Base::Base()
{
 
      year = 1960;
      char* institute="Zhytomyr State Technological University";
}
 
Base::Base(const Base& b)
{
    year = b.year;
    institute = new char[50];
    for(int i = 0; i < 50;i++)
        institute[i] = b.institute[i];
}
Base::~Base()
{
    delete [] institute;
    year = 0;
}
 
student::student()
{
    rating = rand()%100;
}
student::~student()
{
    rating = 0;
}
 
teacher::teacher()
{
    number_of_student = rand()%700;
}
teacher::~teacher()
{
    number_of_student = 0;
}
 
doc::doc()
{
    time = rand()%10;
}
doc::~doc()
{
    time = 0;
}
 
Head_of_the_faculty::Head_of_the_faculty()
{
    money = 1000.00;
}
Head_of_the_faculty::~Head_of_the_faculty()
{
    money = 0;
}
 
///////////////////////////////////////////////////////////////////////
int main()
{
    return 0;
}