Assignment 2 Vectors_Polymorphism.cpp

#include <iostream>
#include <cmath>
#include <string>
#include <vector>
using namespace std;

class Shape
{
public:
	virtual ~Shape() { }
	virtual double getArea() = 0;
	virtual double getPerimeter() = 0;
	virtual string getType() = 0;
};

class RightTriangle : public Shape
{
public:
	RightTriangle(double b, double h) : _b(b), _h(h) { }
	~RightTriangle() { }
	double getArea() { return 0.5*_b*_h; }
	double getPerimeter() { return sqrt(_b*_b + _h * _h) + _h + _b; }
	string getType() { return "Right Triangle"; }
private:
	double _b, _h;
};

class rectangle : public Shape 
{
public:
	rectangle(double b, double h)
	{
		_b = b;
		_h = h;
	}
	rectangle() {}; 
	double getArea()
	{
		return (_b*_h); 
	}
	double getPerimeter()
	{
		return (2 * (_b + _h));
	}
	string getType()
	{
		return ("rectangle"); 
	}

private:
	double _b, _h; 
};

class square : public Shape
{
public:
	square(double l)
	{
		_b = l;
		
	}
	square() {};
	double getArea()
	{
		return (_b*_b);
	}
	double getPerimeter()
	{
		return (4*_b);
	}
	string getType()
	{
		return ("square");
	}

private:
	double _b; 
};

class circle : public Shape
{
public:
	circle(double r)
	{
		_r = r;

	}
	circle() {};
	double getArea()
	{
		return (3.14*(_r*_r));
	}
	double getPerimeter()
	{
		return (2*3.14*_r);
	}
	string getType()
	{
		return ("circle");
	}

private:
	double _r;
};

int main()
{
	vector<Shape *> shapeList;

	int selection = -1;
	while (selection != 0) {
		cout << "Choose an option:" << endl;
		cout << "=================" << endl;
		cout << "Enter '0' to quit" << endl;
		cout << "Enter '1 base height' for a right triangle with given base and height" << endl;
		cout << "Enter '2 base height' for a rectangle with given base and height" << endl;
		cout << "Enter '3 side' for a square with given side length" << endl;
		cout << "Enter '4 radius' for a circle" << endl;
		cout << "> ";
		cin >> selection;
		// Right Triangle case
		if (selection == 1) {
			double b, h;
			cin >> b >> h;
			shapeList.push_back(new RightTriangle(b, h));
		}
		// Rectangle case
		else if (selection == 2) {
			double b, h;
			cin >> b >> h;
			shapeList.push_back(new rectangle(b, h));
		}
		// Square case
		else if (selection == 3) {
			double s;
			cin >> s;
			shapeList.push_back(new square(s));
		}
		// Circle case
		else if (selection == 4) {
			float r;
			cin >> r;
			shapeList.push_back(new circle(r));
		}
	}
	for (vector<Shape *>::iterator it = shapeList.begin();
		it != shapeList.end();
		++it)
	{
		Shape *s = *it;
		cout << s->getType() << ": Area=" << s->getArea() << " Perim=" << s->getPerimeter() << endl;
		delete s;
	}
	system ("pause"); 
	return 0;
}