ex8_06.cpp

Beginning Visual C++ 6源码。Wrox。

// EX8_06.CPP
// A class with private members
#include <iostream>
using namespace std;

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_Breadth(bv),
                                                            m_Height(hv)
   {
      cout << endl << "Constructor called.";
   }

      // Function to calculate the volume of a box
      double Volume()
      {
         return m_Length*m_Breadth*m_Height;
      }

   private:
      double m_Length;                       // Length of a box in inches
      double m_Breadth;                      // Breadth 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;
}