// file: circle.h
// Circle class derived from Point class 
// adds private radius to base class [x,y] coordinates
#ifndef CIRCLE_H
#define CIRCLE_H

#include "point.h"  // Point class definition

class Circle : public Point {

public:

   // default constructor
   Circle( 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 Circle object

private: 
   double radius;  // Circle's radius

}; // end class Circle

#endif 

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