cylinder.cpp

来自「《c＋＋大学教程》源码」· C++ 代码 · 共 75 行

// Fig. 10.19: cylinder.cpp
// Cylinder class inherits from class Circle.
#include <iostream>

using std::cout;

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

// default constructor
Cylinder::Cylinder( int xValue, int yValue, double radiusValue, 
  double heightValue ) 
  : Circle( 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

// override virtual function getArea: return Cylinder area
double Cylinder::getArea() const
{
   return 2 * Circle::getArea() +           // code reuse
      getCircumference() * getHeight();

} // end function getArea

// override virtual function getVolume: return Cylinder volume
double Cylinder::getVolume() const
{
   return Circle::getArea() * getHeight();  // code reuse

} // end function getVolume

// override virtual function getName: return name of Cylinder
string Cylinder::getName() const
{
   return "Cylinder";

}  // end function getName

// override virtual function print: output Cylinder object
void Cylinder::print() const
{
   Circle::print();  // code reuse
   cout << "; height is " << getHeight();

} // end function print

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