cylinder.cpp

《c＋＋大学教程》源码

// Fig. 9.23: cylinder.cpp
// Cylinder class inherits from class Circle4.
#include <iostream>  

using std::cout;

#include "cylinder.h"   // Cylinder class definition

// default constructor
Cylinder::Cylinder( int xValue, int yValue, double radiusValue, 
  double heightValue ) 
  : Circle4( xValue, yValue, radiusValue )
{
   setHeight( heightValue );

} // end Cylinder constructor

// set Cylinder's height
void Cylinder::setHeight( double heightValue )
{
   height = ( heightValue < 0.0 ? 0.0 : heightValue );

} // end function setHeight

// get Cylinder's height
double Cylinder::getHeight() const
{
   return height;

} // end function getHeight

// redefine Circle4 function getArea to calculate Cylinder area
double Cylinder::getArea() const
{
   return 2 * Circle4::getArea() + 
      getCircumference() * getHeight();

} // end function getArea

// calculate Cylinder volume
double Cylinder::getVolume() const
{
   return Circle4::getArea() * getHeight();

} // end function getVolume

// output Cylinder object
void Cylinder::print() const
{
   Circle4::print();
   cout << "; Height = " << getHeight();

} // end function print

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