//Learn LSP at https://www.tutorialsteacher.com/csharp/liskov-substitution-principle

using System;

​

public class Program

{

    public static void Main()

    {

        Rectangle sqr1 = new Square();

        sqr1.Height = 6;

        sqr1.Width = 8;

        Console.WriteLine(AreaCalculator.CalculateArea(sqr1)); //returns 64

        Rectangle sqr2 = new Square();

        sqr2.Height = 8;

        sqr2.Width = 6;

        Console.WriteLine(AreaCalculator.CalculateArea(sqr2)); //returns 36

    }

}

​

public class Rectangle

{

    public virtual int Height { get; set; }

​

    public virtual int Width { get; set; }

}

​

class Square : Rectangle

{

    private int _height;

    private int _width;

    public override int Height

    {

        get

        {

            return _height;

        }

​

        set

        {

            _height = value;

            _width = value;

        }

    }

​

    public override int Width

    {

        get

        {

            return _width;

        }

​

        set

        {

            _width = value;

            _height = value;

        }

    }

}

​

public class AreaCalculator

{

    public static int CalculateArea(Rectangle r)

    {

        return r.Height * r.Width;

    }

}