class Pes
    {
        public string Jmeno;
        public int Vaha, Vyska;
        public long KolikLidiPokousal;
        public Pes(string jmeno, int vaha, int vyska, long kolikLidiPokousal)
        {
            this.Jmeno = jmeno;
            this.Vaha = vaha;
            this.Vyska = vyska;
            this.KolikLidiPokousal = kolikLidiPokousal;
        }
        public void Stekni()
        {
            Console.WriteLine("haf! jmenuju se {0} a uz jsem pokousal {1} lidi!", Jmeno, KolikLidiPokousal);
        }
    }
    
    ............
            Pes pes = new Pes("alik", 5, 20, 2);
            pes.Stekni();    
    
------------------------------






    class VelkyPes : Pes
    {
        public VelkyPes(string jmeno, int vaha, int vyska, long kolikLidiPokousal)
            : base(jmeno, vaha, vyska, kolikLidiPokousal)
        {
        }
        public new void Stekni()
        {
            Console.WriteLine("HAF! HAF! Uz jsem pokousal {1} lidi!",
                Jmeno, KolikLidiPokousal + 1000);
        }
    }
    ............
            VelkyPes vip = new VelkyPes("Harold", 105, 50, 0);
            vip.Stekni();    
            
            
------------------------------
        public new void Stekni2()
        {
            Console.Write("base: ");
            base.Stekni();
            Console.WriteLine("(HAF! HAF!)");
        }   
------------------------------
        public new void Stekni2x()
        {
            Stekni(); Stekni();
        }
        ...
            Pes pes = new Pes("alik", 5, 20, 2);
            pes.Stekni2x();

            VelkyPes vip = new VelkyPes("Harold", 105, 50, 0);
            vip.Stekni2x();
------------------------------
            Pes p;

            for (int i = 1; i <= 2; i++)
            {
                if (i == 1)
                    p = new Pes("brok", 5, 20, 0);
                else
                    p = new VelkyPes("CECIL", 111, 111, 57);

                p.Stekni();
            }
------------------------------

    abstract class Zvire
    {
        public string jmeno;
        public abstract void VydejZvuk();
        public void Init(string jmeno)
        {
            this.jmeno = jmeno;
        }
    }

    class Tygr: Zvire
    {
        public Tygr(string jmeno)
        {
            Init(jmeno);
        }
        public override void VydejZvuk()
        {
            Console.WriteLine("{0}: Uaaaaaa!", jmeno);
        }
    }

    class Ara : Zvire
    {
        public Ara(string jmeno)
        {
            Init(jmeno);
        }
        public override void VydejZvuk()
        {
            Console.WriteLine("{0}: Dobrrrrraaa prrrraaaace!!", jmeno);
        }
    }

    class Ryba : Zvire
    {
        public Ryba(string jmeno)
        {
            Init(jmeno);
        }
        public override void VydejZvuk()
        {
            Console.WriteLine("{0}: ...", jmeno);
        }
    }

    class Had : Zvire
    {
        public Had(string jmeno)
        {
            Init(jmeno);
        }
        public override void VydejZvuk()
        {
            Console.WriteLine("{0}: Sssssssss...", jmeno);
        }
    }
    ........................
      Zvire[] zoo = new Zvire[10];
      zoo[0] = new Tygr("Jonatan");
      zoo[1] = new Ara("Lora");
      zoo[2] = new Ryba("Pepik");
      zoo[3] = new Ryba("Julie");
      zoo[4] = new Ara("Flint");
      zoo[5] = new Tygr("Samba");

      for (int i=0;i<=5;i++)
          zoo[i].VydejZvuk();    
------------------------------
    public static int PocetZvirat = 0;
    ...
        public Zvire()
        {
            PocetZvirat++;
        }
    ...
    for (int i = 0; i < Zvire.PocetZvirat; i++)
                zoo[i].VydejZvuk();        
------------------------------
        private static int Pocet = 0;
        ...
        public static int PocetVsechZvirat()
        {
            return Pocet;
        }
------------------------------
    class PolyPed
    {
        private int pocetNoh;
        public int PocetNoh
        {
            get
            {
                return pocetNoh;
            }
            set
            {
                if ((value == 0) || (value == 2) || (value == 4) || (value == 6) || (value == 8) || (value == 100))
                {
                    pocetNoh = value;
                }
            }
        }
    }
    ...
            PolyPed pp = new PolyPed();

            pp.PocetNoh = 2;
            Console.WriteLine(pp.PocetNoh);

            pp.PocetNoh = 4;
            Console.WriteLine(pp.PocetNoh);

            pp.PocetNoh = 7;
            Console.WriteLine(pp.PocetNoh);

            pp.PocetNoh = 1;
            Console.WriteLine(pp.PocetNoh);
------------------------------
------------------------------
------------------------------
------------------------------
------------------------------