// 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;
  }