// Ex7_12.cpp
  // Using a static data member in a class
  include <iostream>
  using std::cout;
  using std::endl;
  
  class CBox                             // Class definition at global scope
  {
    public:
      static int objectCount;            // Count of objects in existence
  
      // Constructor definition
      CBox(double lv, double bv = 1.0, double hv = 1.0)
      {
        cout << endl << "Constructor called.";
        m_Length = lv;                   // Set values of
        m_Width = bv;                    // data members
        m_Height = hv;                   
        objectCount++;
      }
  
      CBox()                             // Default constructor
      {
        cout << endl
             << "Default constructor called.";
        m_Length = m_Width = m_Height = 1.0;
        objectCount++;
      }
  
      // Function to calculate the volume of a box
      double Volume() const
      {
        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 CBox::objectCount = 0;             // Initialize static member of CBox class
  
  int main()
  {
    CBox boxes[5];                       // Array of CBox objects declared
    CBox cigar(8.0, 5.0, 1.0);           // Declare cigar box
  
    cout << endl << endl
         << "Number of objects (through class) = "
         << CBox::objectCount;
     
    cout << endl
         << "Number of objects (through object) = "
         << boxes[2].objectCount;
  
    cout << endl;
    return 0;
  }