// Class members (data & methods) can be public/private/protected.
// The default is private.
//
// public: anyone can access them
// private: nobody except other methods of this class can access them
// protected: can be accessed by this class, and by immediately derived class
//
// There is also public/private/protected inheritance.
// The default is private.
//
// public:    public members in base class are my public members
//            protected members in base class are my private members
//
// private:   public & protected members in base class are my private members
//
// protected: public & protected members in base class are my protected members

class Base {		    // A base class, with a variable of each type
  public:
    int pub;		    // I’m public!
  private:
    int priv;		    // I’m private!
  protected:
    int prot;		    // I’m a little teapot, short & stout.
};

class D1 : public Base {
  public:
    int foo1()  { return pub; }
    // int foo2()  { return priv; }	// Sorry, but Base::priv is private
    int foo3()  { return prot; }
};

class D2 : private Base {
  public:
    int foo1()  { return pub; }
    // int foo2()  { return priv; }	// Sorry, but Base::priv is private
    int foo3()  { return prot; }
};

class D3 : protected Base {
  public:
    int foo1()  { return pub; }
    // int foo2()  { return priv; }	// Sorry, but Base::priv is private
    int foo3()  { return prot; }
};

int main() {
    Base b;
    // return b.priv;		    // Sorry, but Base::priv is private
    // return b.prot;		    // Sorry, but Base::prot is protected
    return b.pub;

    D1 d1;
    return d1.pub;
    // return d1.priv;		    // Sorry, but D1::priv is private
    // return d1.prot;		    // Sorry, but D1::prot is private

    D2 d2;
    // return d2.pub;		    // Sorry, but D2::prot is private
    // return d2.priv;		    // Sorry, but D2::priv is private
    // return d2.prot;		    // Sorry, but D2::prot is private

    D3 d3;
    // return d3.pub;		    // Sorry, but D3::pub is protected
    // return d3.priv;		    // Sorry, but D3::priv is protected
    // return d3.prot;		    // Sorry, but D3::prot is protected
}