// File: ex7-1.cpp

#include <iostream>
using namespace std;

class Base
{
protected:
    int b;
public:
    Base(int n);
    void print() const
    {
        cout << "Base data is " << b << endl;
    }
};

Base::Base(int n) : b(n)
{
    cout << "created Base object: " << this << endl;
}

class Derived : public Base
{
private:
    int d;
public:
    Derived(int x,int y);
    void print() const;
    void printBase() const
    {
        cout << this << "'s Base is " << b << endl;
    }
};

Derived::Derived(int x, int y) : Base(x), d(y)
{
    cout << "created Derived object: " << this << endl;
}

void Derived::print(void) const
{
    cout << "Derived data is " << d << endl;
    Base::print();
}

int main()
{
    Base b1(5);

    // print base object
    b1.print();
    cout << endl;
    Derived d1(3,4);

    // print derived object
    d1.print();
    cout << endl;

    d1.printBase();

    // call base class print() from derived class object
    d1.Base::print();
    cout << endl;

    cout << "how big is an int? " << sizeof(int) << endl;
    cout << "how big is a Base? " << sizeof b1 << endl;
    cout << "how big is a Derived? " << sizeof d1 << endl;
}