// polygon3a.cc
#include <iostream>
#include <string>
using namespace std;

class Polygon
{
  private:
    int NumSides; // outsiders shouldn't be able to change this
  public:
    void Draw(void) {
      cout << "Drawing polygon with " << NumSides << " sides." << endl;
    }
    Polygon(int sides) {
      NumSides = sides;
      cout << "In Polygon constructor with " << NumSides << " sides" << endl;
    }
};

class Square: public Polygon
{
  public:
    Square(): Polygon(4) { // Call base class constructor with required args
      cout << "In Square constructor" << endl;
    }
};

class Triangle: public Polygon
{
  public:
    Triangle(): Polygon(3) { // Call base class constructor with required args
      cout << "In Triangle constructor" << endl;
    }
};
  
int main()
{
  Triangle MyTriangle;
  Polygon MyPentagon(5);
  //MyTriangle.NumSides = 4; // Now we can't do this...good!
  MyTriangle.Draw();
  MyPentagon.Draw();
}