circle2.h

《c＋＋大学教程》源码

// Fig. 9.10: circle2.h
// Circle2 class contains x-y coordinate pair and radius.
#ifndef CIRCLE2_H
#define CIRCLE2_H

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

class Circle2 : public Point {

public:

   // default constructor
   Circle2( int = 0, int = 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 Circle2 object

private: 
   double radius;  // Circle2's radius

}; // end class Circle2

#endif 

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