// Ex7_05.cpp
  // Supplying and using a default constructor
  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
  
      // Constructor definition
      CBox(double lv, double bv, double hv)  
      {
        cout << endl << "Constructor called.";
        m_Length = lv;                   // Set values of
        m_Width = bv;                    // data members
        m_Height = hv;
      }
  
      // Default constructor definition
      CBox()
      { 
        cout << endl << "Default constructor called.";
      }
  
      // Function to calculate the volume of a box
      double Volume()
      {
        return m_Length*m_Width*m_Height;
      }
  };
  
  int main()
  {
    CBox box1(78.0,24.0,18.0);           // Declare and initialize box1
    CBox box2;                           // Declare box2 - no initial values
    CBox cigarBox(8.0, 5.0, 1.0);        // Declare and initialize cigarBox
  
    double boxVolume = 0.0;              // Stores the volume of a box
  
    boxVolume = box1.Volume();           // Calculate volume of box1
    cout << endl
         << "Volume of box1 = " << boxVolume;
  
    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
  
    cout << endl
         << "Volume of box2 = "
         << box2.Volume();
  
    cout << endl
          << "Volume of cigarBox = "
          << cigarBox.Volume();
  
    cout << endl;
    return 0;
  }