class box{

public: double height, width, length;

box() {}; //Default constructor

box (double h, double w, double l) //with arguments

{height = h; width = w; length =l;};

double volume ()

{return height * width * length;}

};

class box_car : public railroad_car, private box {

public: box_car() : box (10.5, 9.5, 40.0){}; // Default constructor

}

• box_car in this example cannot access box private members.
• box's public and protected members are private within box_car: Accessible, but not public, and even derived classes can't access