circle.h

《c＋＋大学教程》源码

// Fig. 9.7: circle.h
// Circle class contains x-y coordinate pair and radius.
#ifndef CIRCLE_H
#define CIRCLE_H

class Circle {

public:

   // default constructor
   Circle( int = 0, int = 0, double = 0.0 );  

   void setX( int );           // set x in coordinate pair
   int getX() const;           // return x from coordinate pair
   
   void setY( int );           // set y in coordinate pair
   int getY() const;           // return y from coordinate pair
    
   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: 
   int x;          // x-coordinate of Circle's center
   int y;          // y-coordinate of Circle's center
   double radius;  // Circle's radius

}; // end class Circle

#endif 

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