Chiarimento su codice

using System;
using System.Drawing;


namespace ConsoleApplication1
{
    class Point
    {
        protected string x;
        protected string y;
    }

    class DerivedPoint : Point
    {
        static void Main()
        {
            DerivedPoint dp = new DerivedPoint();
            dp.x = "prova";
            dp.y = "test";
            Console.WriteLine("x = {0}, y = {1}", dp.x, dp.y);
        }

    }
}

"x = {0}, y = {1}"