// file: CircleProtected.h
// CircleProtected class derives from PointProtected class 
// adds private radius to protected [x,y] coordinates of base class 
// expanding the hierarchy with a CylinderProtected class in the same style
// requires the private radius to become protected

#ifndef CIRCLEPROTECTED_H
#define CIRCLEPROTECTED_H

#include "pointProtected.h"  // PointProtected class definition

class CircleProtected : public PointProtected {

public:

   // default constructor
   CircleProtected( double  = 0, double  = 0, double = 0.0 );  

   void setRadius( double );   // set radius
   double getRadius() const;   // return radius

   double getDiameter() const;       // return diameter
   double getCircumference() const;  // return circumference
   double getArea() const;           // return area

   void print() const;         // output CircleProtected object

private: 
   double radius;  // CircleProtected's radius

}; // end class CircleProtected

#endif 

/*Adapted from Deitel & Deitel: C++ How to Program. Fourth edition.
 * Chapter 9
 * Prentice Hall, 2003. 
 */