ex8_02.cpp

Beginning Visual C++ 6源码。Wrox。

// EX8_02.CPP
// Calculating the volume of a box with a member function
#include <iostream>
using namespace std;

class CBox                                 // Class definition at global scope
{
   public:
      double m_Length;                     // Length of a box in inches
      double m_Breadth;                    // Breadth 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_Breadth*m_Height;
      }
};

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

   double boxVolume = 0.0;                 // Store the volume of a box here

   box1.m_Height = 18.0;                   // Define the values
   box1.m_Length = 78.0;                   // of the members of
   box1.m_Breadth = 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_Breadth = 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;
}