// polygon2.cc
#include <iostream>
#include <string>
using namespace std;

class Polygon
{
  public:
    int NumSides;
    void Draw(void) {
      cout << "Drawing polygon with " << NumSides << " sides." << endl;
    }
    Polygon(int sides) {
      NumSides = sides;
    }
};

class Square: public Polygon
{
  public:
    Square() { 
      NumSides = 4;
    }
    // the above constructor won't work b/c there isn't a corresponding
    // default constructor for the base class, Polygon
};

class Triangle: public Polygon
{
  public:
    Triangle() {
      NumSides = 3;
    }
    // the above constructor won't work b/c there isn't a corresponding
    // default constructor for the base class, Polygon
};
  
int main()
{
  Triangle MyTriangle;
  Square MySquare;
  Polygon MyPentagon(5);
  MyTriangle.Draw();
  MySquare.Draw();
  MyPentagon.Draw();
}