[OOP] Fundamental Principles Part II - Задача 1

using System;

class Polymorphism
{
    static void Main(string[] args)
    {
        Shape[] figures = new Shape[]
        {
            new Rectangle(3,3),
            new Circle(2),
            new Rectangle(2,3),
            new Circle(5),
            new Triangle(5,7),
            new Triangle(2,3)
        };

        foreach (Shape figure in figures)
        {
            Console.WriteLine("Figure = {0} surface = {1:F2}",
                figure.GetType().Name.PadRight(9, ' '),
                figure.CalculateSurface());
        }
    }
}
public abstract class Shape
{
    private int width;
    private int height;

    public int Width
    {
        get { return this.width; }
        set
        {
            if (this.width < 0)
            {
                throw new ArgumentOutOfRangeException();
            }
            this.width = value;
        }
    }
    public int Height
    {
        get { return this.height; }
        set
        {
            if (this.height < 0)
            {
                throw new ArgumentOutOfRangeException();
            }
            this.height = value;
        }
    }

    public Shape(int width, int height)
    {
        this.Width = width;
        this.Height = height;
    }

    public abstract double CalculateSurface();
}
public class Triangle : Shape
{
    public Triangle(int width, int height)
        : base(width, height)
    {
    }

    public override double CalculateSurface()
    {
        return this.Width * this.Height / 2;
    }
}
public class Rectangle : Shape
{
    public Rectangle(int width, int height)
        : base(width, height)
    {
    }

    public override double CalculateSurface()
    {
        return this.Width * this.Height;
    }
}
public class Circle : Shape
{
    public Circle(int radius)
        : base(radius, height: radius)
    {
    }
    public override double CalculateSurface()
    {
        return Math.PI * this.Width * this.Width;
    }
}