ex7_03.cpp

Visual C++ 2005的源代码

// Ex7_03.cpp
// Calculating the volume of a box with a member function
#include <iostream>
using std::cout;
using std::endl;

class CBox                             // Class definition at global scope
{
  public:
    double m_Length;                   // Length of a box in inches
    double m_Width;                    // Width of a box in inches
    double m_Height;                   // Height of a box in inches

  // Function to calculate the volume of a box
  double Volume()
  {
    return m_Length*m_Width*m_Height;
  }
};

int main()
{
  CBox box1;                           // Declare box1 of type CBox
  CBox box2;                           // Declare box2 of type CBox

  double boxVolume = 0.0;              // Stores the volume of a box

  box1.m_Height = 18.0;                // Define the values
  box1.m_Length = 78.0;                // of the members of
  box1.m_Width = 24.0;                 // the object box1

  box2.m_Height = box1.m_Height - 10;  // Define box2
  box2.m_Length = box1.m_Length/2.0;   // members in
  box2.m_Width = 0.25*box1.m_Length;   // terms of box1

  boxVolume = box1.Volume();           // Calculate volume of box1
  cout << endl
       << "Volume of box1 = " << boxVolume;

  cout << endl
       << "Volume of box2 = "
       << box2.Volume();

  cout << endl
       << "A CBox object occupies "
       << sizeof box1 << " bytes.";

  cout << endl;
  return 0;
}