// Ex7_07.cpp
  // A class with private members
  include <iostream>
  using std::cout;
  using std::endl;
  
  class CBox                             // Class definition at global scope
  {
    public:
  
      // Constructor definition using an initialisation list
      CBox(double lv = 1.0, double bv = 1.0, double hv = 1.0):
                               m_Length(lv), m_Width(bv), m_Height(hv)
     {
       cout << endl << "Constructor called.";
     }
  
     // Function to calculate the volume of a box
     double Volume()
     {
       return m_Length*m_Width*m_Height;
     }
  
    private:
      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
  };
  
  int main()
  {
    CBox match(2.2, 1.1, 0.5);           // Declare match box
    CBox box2;                           // Declare box2 - no initial values
  
    cout << endl
         << "Volume of match = "
         << match.Volume();
  
  // Uncomment the following line to get an error
  // box2.m_Length = 4.0;
  
    cout << endl
         << "Volume of box2 = "
         << box2.Volume();
  
    cout << endl;
    return 0;
  }