// polygon3d.cc
#include <iostream>
#include <string>
using namespace std;

class Polygon
{
  protected:
    int NumSides; // outsiders shouldn't be able to change this
                  // but perhaps derived classes should be able to access it
  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 Triangle: public Polygon
{
  public:
    Triangle(): Polygon(3) { // Call base class constructor with required args
      cout << "In Triangle constructor" << endl;
    }
    void Report(void) {
      cout << "I'm a triangle, I have " << NumSides << " sides." << endl; 
    }
};
  
class RightTriangle: public Triangle
{
  public:
    RightTriangle(): Triangle() {
      cout << "In RightTriangle constructor" << endl;
    }
    void Report(void) {
      cout << "I'm a right triangle, I have " << NumSides << " sides." << endl;
    }
};

int main()
{
  RightTriangle MyRightTriangle;
  MyRightTriangle.Report();
}