// Fig. 10.11: circle.cpp
// Circle class member-function definitions.
#include <iostream>  

using std::cout;

#include "circle.h"   // Circle class definition

// default constructor
Circle::Circle( int xValue, int yValue, double radiusValue )
   : Point( xValue, yValue )  // call base-class constructor
{
   setRadius( radiusValue );

} // end Circle constructor

// set radius 
void Circle::setRadius( double radiusValue )
{
   radius = ( radiusValue < 0.0 ? 0.0 : radiusValue );

} // end function setRadius

// return radius 
double Circle::getRadius() const
{
   return radius;

} // end function getRadius

// calculate and return diameter
double Circle::getDiameter() const
{
   return getRadius() * 2;

} // end function getDiameter

// calculate and return circumference
double Circle::getCircumference() const
{
   return 3.14159 * getDiameter();

} // end function getCircumference

// calculate and return area
double Circle::getArea() const
{
   return 3.14159 * getRadius() * getRadius();

} // end function getArea

// output Circle object
void Circle::print() const
{
   cout << "Center = ";
   Point::print();      // invoke Point's print function
   cout << "; Radius = " << getRadius();

} // end function print

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