#include <iostream>
#include <math.h>
using namespace std;

class Shape {
  int stub;

public:
  virtual void getData() { cout << "stub"; }

  virtual double area() {
    cout << "stub";
    return 0;
  }
};

class Triangle : public Shape {
private:
  double sides[3];

public:
  void getData();
  double area();
};

void Triangle::getData() {
  cout << "Enter 3 integers for the sides of triangle: \n";

  for (int i = 0; i < 3; i++)
    cin >> sides[i];
}

double Triangle::area() {
  double s = (sides[0] + sides[1] + sides[2]) / 2;

  return sqrt(s * (s - sides[0]) * (s - sides[1]) * (s - sides[2]));
}

class Rectangle : public Shape {
private:
  double l;
  double b;

public:
  void getData();
  double area();
};

void Rectangle::getData() {
  cout << "Enter length of rectangle: ";
  cin >> l;
  cout << "Enter breadh of rectangle: ";
  cin >> b;
}

double Rectangle::area() { return l * b; }

int main() {
  Shape *s;
  Triangle t;
  Rectangle r;

  s = &t;

  s->getData();
  cout << "Area of the Shape: " << s->area() << endl;

  s = &r;

  s->getData();
  cout << "Area of the Shape: " << s->area() << endl;

}