private inheritance in oop

#include<iostream.h>
#include<conio.h>

class aa
{
    protected:
        int n;
    public:

        void get()
    {
    cout<<"enter no";
    cin>>n;
    }
};


class bb : public aa          //the keyword public specifies that objects of the derived class are able to access public member functions of the base class.
{                             //the alternative is the keyword private/protected. when this is used, objects of the derived class can't access public member functions of the
    public:                    //base class.

        void show()
    {
    cout<<endl<<n<<endl;
    }
};


class cc: public aa          //the difference b/w publicly derivedand privately derived class is:  objects of the publicly derived class can access public members
{                           //of the base class, while objects of privatly derived class can't; they can only access the public members of their own derived class
    public:

        void show()
    {
    cout<<endl<<--n<<endl;
    }
};


void main()
{
    bb objb;
    cc objc;

    objb. get();
    objb.show();

   objc.get();
    objc.show();

   getch();
}