Shape.cpp

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

class Shape
{
public:
  float area();
};

class Circle : public Shape
{
public:
	Circle() {
		radius = 2.0;
	}
	float area() {
		return radius * radius * 2.146;
	}
private:
	float radius;
};

class Triangle : public Shape
{
public:
	Triangle() {
		baseLength = 10;
		height = 9;
	}
	float area() {
		return (1.0/2.0) * (baseLength * height);
	}
private:
	float baseLength;
	float height;
};

class Rectangle : public Shape
{
public:
	Rectangle() {
		breadth = 20;
		height = 15;
	}
	float area() {
		return breadth * height;
	}
private:
	int breadth;
	int height;
};

int main()
{
	Circle c1;
	Triangle t1;
	Rectangle r1;

	cout << "Area of Circle: " <<  c1.area() << endl;
	cout << "Area of Triangle: " << t1.area() << endl;
	cout << "Area of Rectangle: " << r1.area() << endl;

	return 0;
}