public static void Main(string[] args)
        {
            NekaKlasa sample  = new NekaKlasa();
            IKontrola control = sample;
            IPovrs    surface = sample;

            control.Iscrtaj();
            surface.Iscrtaj();
        }
        public static void Main(string[] args)
        {
            NekaKlasa sample  = new NekaKlasa();
            IKontrola control = sample;
            IPovrs    surface = sample;

            // The following lines all call the same method.
            sample.Iscrtaj();
            control.Iscrtaj();
            surface.Iscrtaj();
        }