Accesibility in OOP

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

class aa
{
    protected:
        int n;
    public:
 int m;

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




void main()
{

   aa obj;
   obj.get();
   cout<<obj.m;    //here as m is public data member therefore it can be used ouside the class
   //obj.n;        we can't use n outside the class b/c n is the protected data member
   getch();
}

//thus concluded that objects can never access private or protected members ( data members or member function ) of the base class.