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Using a static data member in a class

#include <iostream>    using namespace std;    class CBox                       {       public:          static int objectCount;          CBox(double lv, double bv = 1.0, double hv = 1.0): m_Length(lv),                                                             m_Breadth(bv),                                                             m_Height(hv)          {             cout << "Constructor called.";             objectCount++;          }          CBox()          {             cout << "Default constructor called.";             m_Length = m_Breadth = m_Height = 1.0;             objectCount++;          }          double Volume() const          {             return m_Length*m_Breadth*m_Height;          }       private:          double m_Length;          double m_Breadth;          double m_Height;     };    int CBox::objectCount = 0;                                  int main()    {       CBox boxes[5];                CBox cigar(8.0, 5.0, 1.0);       cout << CBox::objectCount;       cout << boxes[2].objectCount;       return 0;    }