15_5.cpp

//multiple inheritance
#include <iostream>
using namespace std;

class CPolygon
{
      protected:
                int width, height;
      public:
             void set_values(int a, int b)
             {
                  width = a;
                  height = b;
             }
};

class COutput
{
      public:
             void output(int i);
};

void COutput::output(int i)
{
     cout << i << endl;
}

class CRectangle: public CPolygon, public COutput
{
      public:
             int area()
             {
                 return (width*height);
             }
};

class CTriangle: public CPolygon, public COutput
{
      public:
             int area(void)
             {
                 return (width*height/2);
             }
};

int main()
{
    CRectangle rect;
    CTriangle trgl;
    rect.set_values(4,5);
    trgl.set_values(4,5);
    rect.output(rect.area());
    trgl.output(trgl.area());
    getchar();
    return 0;
}