using System;

​

// Demo: Structs

​

// No inheritance

// Value type (can contain reference types)

// 

struct Point2D

{

    private readonly int _x;

    private readonly int _y;

    public Point2D(int x, int y)

    {

        _x = x;

        _y = y;

    }

    public int X

    {

        get { return _x; }

    }

    public int Y

    {

        get { return _y; }

    }

    public double DistanceTo(Point2D other)

    {

        var x = Math.Pow(other.X - this.X, 2);

        var y = Math.Pow(other.Y - this.Y, 2);

        return Math.Sqrt(x + y);

    }

}

​

var p1 = new Point2D(5, 10);

var p2 = new Point2D(3, 7);

​

var distance = p1.DistanceTo(p2);

Console.WriteLine(distance);

​