Point/Circle Hierarchy using private data

Class Point3 (Figs. 1-2) declares data members x and y as private and exposes member functions setX, getX, setY, getY and print for manipulating these values.

Figure 1: Point3 class header file. Point/Circle Hierarchy Using private Data

Figure 2: Point3 class uses member functions to manipulate its private data.

Figure 3: Circle4 class header file.

Figure 4: Circle4 class that inherits from class Point3, which does not provide protected data. (part 1 of 2)

Figure 5: Circle4 class that inherits from class Point3, which does not provide protected data. (part 2 of 2)

Figure 6: Base class private data is accessible to a derived class via public or protected member function inherited by the derived class.