using System;

using System.Collections.Generic;

using static System.Console;

​

List<Tier> tiere = new ()

{

    new Katze { name = "Freddy" },

    new Katze { name = "Fibi"   },

    new Hund  { name = "Bello"  },

    new Katze { name = "Isi"    },

    new Hund  { name = "Happy"  },

};

​

foreach (var tier in tiere)

{

    var prefix = tier switch

    {

        Katze => "Die Katze sagt ",

        Hund  => "Der Hund macht ",

        _     => ""

    };

    WriteLine ($"{prefix} {tier.sprich()}");

}

​

WriteLine (DateTime.Now);

​

​

interface Tier

{ 

    string name {get;set;}

    string sprich();

}

​

class Katze: Tier

{

    public string name {get;set;}

    public string sprich() => "miau";

}

​

class Hund : Tier

{

    public string name {get;set;}

    public string sprich() => "wau wau";

}