Unterricht Tag 4

.gitignore

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 **/bin/
 **/*.kdev4
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Tag 4/Aufgaben/Aufgabe_1.txt

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+/*
+ *  void-Delegate TankfüllstandBeobachter mit Parameter vom Typ PKW.
+
+ *  Enum TankfüllstandLeuchte mit den Farben GRÜN, GELB und ROT.
+
+ *  Klasse PKW
+ *      mit einer TankfüllstandLeuchte,
+ *      einem öffentlichen Attribut vom Typ TankfüllstandBeobachter als Event,
+ *      einem privaten tankfüllstand und einer öffentlichen addTankfüllstand-Methode,
+ *          die den Tankfüllstand erhöhen kann und, wenn der Tankfüllstand größer gleich 15 ist, die Farbe der Leuchte auf Grün setzt.
+ *      einen Konstruktor, der den Tankfüllstand initialisiert,
+ *      eine void-Methode Fahren(), die in einer Schleife "Brumm..." ausgibt und den Tankfüllstand um 1 reduziert, solange der Tankfüllstand größer 0 ist
+ *          und weiterhin, wenn der Tankfüllstand kleiner 15 ist, die Leuchte auf Gelb stellt und das TankfüllstandBeobachter-Event auslöst,
+ *          und wenn der Tankfüllstand kleiner 10 ist, die Leuchte auf Rot stellt und das TankfüllstandBeobachter-Event auslöst.
+
+ *  Klasse Fahrer,
+ *      mit einer Methode "Tanken", die den Tankfüllstand eines übergebenen PKW-Objektes erhöhen kann.
+ *      Und einer Methode "OnTankfüllstandNiedrig", welche zum Delegate passt. Sie fragt aus dem übergebenen PKW die Farbe der TankfüllstandLeuchte ab
+ *          und ist sie Gelb, sagt der Fahrer "Ach, hat noch Zeit...",
+ *          ist sie Rot, sagt der Fahrer "Jetzt aber dringend tanken..." und tankt anschließend den PKW.
+ *
+ */

Tag 4/Aufgaben/Aufgabe_2.txt

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+/* Sie entwickeln eine Software zur Buchung von Reisen. Die Reisenden können ihre gebuchte Reise vor Reiseantritt stornieren. Dazu sollen zwei Algorithmen implementiert werden - ein kulanter Algorithmus und ein strenger Algorithmus. Beim Buchen der Reise wird einer der Algorithmen für die Stornogebühren ausgesucht, der Algorithmus könnte sich aber auch nachträglich noch ändern. Damit der Algorithmus leicht austauschbar ist, verwenden Sie das Strategy-Muster (hier aber über Delegates umgesetzt).
+ *
+ * Jede Reise hat einen Grundpreis und einen Reisebeginn.
+ * Es können für alle Reise-Arten die Anzahl der Tage bis zur Abreise bestimmt werden.
+ * Jede Reise-Art berechnet den Preis auf unterschiedliche Art.
+ * Die Reise wird in zwei Arten unterteilt. Die günstige Bronze-Reise und die teure Gold-Reise.
+ * Die Bronze-Reise kostet Grundpreis * 1.25, die Gold-Reise kostet Grundpreis * 1.75
+ *
+ * Jede Reise hat einen bestimmten Storno-Algorithmus.
+ * Da der Algorithmus beliebig getauscht werden können soll, ist er von der Reise entkoppelt.
+ * Es gibt den strengen Storno Algorithmus und den kulanten Storno Algorithmus.
+ * Eine Stornierung der Reise mit dem strengen Algorithmus kostet 25% der Reisekosten, wenn die Tage bis zur Abreise > 10 sind, sonst 75%.
+ * Die Stornierung mit dem kulanten Algorithmus kostet 25% der Reisekosten, wenn es noch mehr als ein Tag bis zur Reise sind, sonst 50%.
+ * Eine Bronze-Reise verwendet standardmäßig den strengen Algorithmus, eine Gold-Reise verwendet standardmäßig den kulanten Algorithmus.
+ *
+ * Erstellen Sie ein Klassendiagramm und testen Sie das Programm mit C#-Code.
+ */

Tag 4/Aufgaben/Aufgaben.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Tag 4/Aufgaben/Lösung_1/Fahrer.txt

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+using System;
+
+namespace Lösungen
+{
+    internal class Fahrer
+    {
+        public void Tanken(PKW pkw, int wert)
+        {
+            pkw.AddTankfüllstand(wert);
+        }
+
+        public void OnTankfüllstandNiedrig(PKW pkw)
+        {
+            if (pkw.TankfüllstandLeuchte == TankfüllstandLeuchte.GELB)
+            {
+                Console.WriteLine("Ach, hat noch Zeit...");
+            }
+            else if (pkw.TankfüllstandLeuchte == TankfüllstandLeuchte.ROT)
+            {
+                Console.WriteLine("Jetzt aber dringend tanken...");
+                Tanken(pkw, 10);
+            }
+        }
+    }
+}

Tag 4/Aufgaben/Lösung_1/PKW.txt

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+using System;
+using System.Threading;
+
+
+namespace Lösungen
+{
+    internal delegate void TankfüllstandBeobachter(PKW pkw);
+
+    internal enum TankfüllstandLeuchte
+    {
+        GRÜN, GELB, ROT
+    };
+
+    
+    internal class PKW
+    {
+        public TankfüllstandLeuchte TankfüllstandLeuchte { get; set; } = TankfüllstandLeuchte.ROT;
+
+        public event TankfüllstandBeobachter? TankfüllstandEvent;
+
+        private int tankfüllstand;
+        private void SetTankfüllstand(int wert)
+        {
+            tankfüllstand = wert;
+            if (tankfüllstand >= 15)
+                TankfüllstandLeuchte = TankfüllstandLeuchte.GRÜN;
+            else if (tankfüllstand >= 10)
+                TankfüllstandLeuchte = TankfüllstandLeuchte.GELB;
+            else
+                TankfüllstandLeuchte = TankfüllstandLeuchte.ROT;
+        }
+
+        public void AddTankfüllstand(int menge)
+        {
+            SetTankfüllstand(tankfüllstand + menge);            
+        }
+
+        public PKW(int tankfüllstand)
+        {
+            SetTankfüllstand(tankfüllstand);
+        }
+
+        public void Fahren()
+        {
+            while (tankfüllstand > 0)
+            {
+                Console.WriteLine("Brumm...");
+                SetTankfüllstand(tankfüllstand - 1);
+                if (TankfüllstandLeuchte == TankfüllstandLeuchte.GELB || TankfüllstandLeuchte == TankfüllstandLeuchte.ROT)
+                    TankfüllstandEvent?.Invoke(this);
+
+                Thread.Sleep(500);
+            }
+        }
+    }
+}

Tag 4/Aufgaben/Lösung_1/Program.txt

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+/*
+ *  void-Delegate TankfüllstandBeobachter mit Parameter vom Typ PKW.
+
+ *  Enum TankfüllstandLeuchte mit den Farben GRÜN, GELB und ROT.
+
+ *  Klasse PKW
+ *      mit einer TankfüllstandLeuchte,
+ *      einem öffentlichen Attribut vom Typ TankfüllstandBeobachter als Event,
+ *      einem privaten tankfüllstand und einer öffentlichen addTankfüllstand-Methode,
+ *          die den Tankfüllstand erhöhen kann und, wenn der Tankfüllstand größer gleich 15 ist, die Farbe der Leuchte auf Grün setzt.
+ *      einen Konstruktor, der den Tankfüllstand initialisiert,
+ *      eine void-Methode Fahren(), die in einer Schleife "Brumm..." ausgibt und den Tankfüllstand um 1 reduziert, solange der Tankfüllstand größer 0 ist
+ *          und weiterhin, wenn der Tankfüllstand kleiner 15 ist, die Leuchte auf Gelb stellt und das TankfüllstandBeobachter-Event auslöst,
+ *          und wenn der Tankfüllstand kleiner 10 ist, die Leuchte auf Rot stellt und das TankfüllstandBeobachter-Event auslöst.
+
+ *  Klasse Fahrer,
+ *      mit einer Methode "Tanken", die den Tankfüllstand eines übergebenen PKW-Objektes erhöhen kann.
+ *      Und einer Methode "OnTankfüllstandNiedrig", welche zum Delegate passt. Sie fragt aus dem übergebenen PKW die Farbe der TankfüllstandLeuchte ab
+ *          und ist sie Gelb, sagt der Fahrer "Ach, hat noch Zeit...",
+ *          ist sie Rot, sagt der Fahrer "Jetzt aber dringend tanken..." und tankt anschließend den PKW.
+ *
+ */
+
+
+namespace Lösungen
+{
+    class Program
+    {
+        public static void Main(string[] args)
+        {
+            PKW pkw = new PKW(20);
+            Fahrer fahrer = new Fahrer();
+            pkw.TankfüllstandEvent += fahrer.OnTankfüllstandNiedrig;
+
+            pkw.Fahren();
+        }
+
+    }
+}

Tag 4/Aufgaben/Lösung_1v2/Aufgabe_1.txt

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+namespace Aufgaben;
+
+public class Aufgabe_1
+{
+    public static void Main(string[] args)
+    {
+        Pkw pkw = new Pkw(20);
+        Fahrer fahrer = new Fahrer();
+        pkw.TankfüllstandBeobachter += fahrer.OnTankfüllstandNiedrig;
+        
+        pkw.Fahren();
+    }
+}

Tag 4/Aufgaben/Lösung_1v2/Fahrer.txt

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+using System;
+
+namespace Aufgaben;
+/*
+ *  Klasse Fahrer,
+ *      mit einer Methode "Tanken", die den Tankfüllstand eines übergebenen PKW-Objektes erhöhen kann.
+ *      Und einer Methode "OnTankfüllstandNiedrig", welche zum Delegate passt. Sie fragt aus dem übergebenen PKW die Farbe der TankfüllstandLeuchte ab
+ *          und ist sie Gelb, sagt der Fahrer "Ach, hat noch Zeit...",
+ *          ist sie Rot, sagt der Fahrer "Jetzt aber dringend tanken..." und tankt anschließend den PKW.
+ *
+ */
+public class Fahrer
+{
+    public static void Tanken(Pkw pkw, int menge)
+    {
+        if (menge > 0)
+            pkw.AddTankfüllstand(menge);
+    }
+
+    public void OnTankfüllstandNiedrig(Pkw pkw)
+    {
+        switch (pkw.Leuchte)
+        {
+            case TankfüllstandLeuchte.Gelb:
+                Console.WriteLine("Ach, hat noch Zeit...");
+                break;
+            case TankfüllstandLeuchte.Rot:
+                Console.WriteLine("Jetzt aber dringend tanken...");
+                Tanken(pkw, 15);
+                break;
+        }
+    }
+}

Tag 4/Aufgaben/Lösung_1v2/PKW.txt

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+using System;
+using System.Threading;
+
+namespace Aufgaben;
+
+/*
+ *  Klasse PKW
+ *      mit einer TankfüllstandLeuchte,
+ *      einem öffentlichen Attribut vom Typ TankfüllstandBeobachter als Event,
+ *      einem privaten tankfüllstand und einer öffentlichen addTankfüllstand-Methode,
+ *          die den Tankfüllstand erhöhen kann und, wenn der Tankfüllstand größer gleich 15 ist, die Farbe der Leuchte auf Grün setzt.
+ *      einen Konstruktor, der den Tankfüllstand initialisiert,
+ *      eine void-Methode Fahren(), die in einer Schleife "Brumm..." ausgibt und den Tankfüllstand um 1 reduziert, solange der Tankfüllstand größer 0 ist
+ *          und weiterhin, wenn der Tankfüllstand kleiner 15 ist, die Leuchte auf Gelb stellt und das TankfüllstandBeobachter-Event auslöst,
+ *          und wenn der Tankfüllstand kleiner 10 ist, die Leuchte auf Rot stellt und das TankfüllstandBeobachter-Event auslöst.
+ */
+
+public class Pkw
+{
+    private TankfüllstandLeuchte leuchte;
+    private int tankfüllstand;
+
+    public event TankfüllstandBeobachter? TankfüllstandBeobachter;
+
+    public TankfüllstandLeuchte Leuchte
+    {
+        get => leuchte;
+        private set
+        {
+            leuchte = value;
+            TankfüllstandBeobachter?.Invoke(this);
+        }
+    }
+
+    public void AddTankfüllstand(int menge)
+    {
+        tankfüllstand = tankfüllstand + menge;
+        Leuchte = tankfüllstand >= 15 ? TankfüllstandLeuchte.Grün 
+            : tankfüllstand >= 10 ? TankfüllstandLeuchte.Gelb 
+            : TankfüllstandLeuchte.Rot;
+
+        /*if (tankfüllstand >= 15)
+            Leuchte = TankfüllstandLeuchte.Grün;
+        else if (tankfüllstand >= 10)
+            Leuchte = TankfüllstandLeuchte.Gelb;*/
+    }
+
+    public Pkw(int tankfüllstand)
+    {
+        AddTankfüllstand(tankfüllstand);
+    }
+
+    public void Fahren()
+    {
+        while (tankfüllstand > 0)
+        {
+            Console.WriteLine("Brumm...");
+            AddTankfüllstand(-1);
+            Thread.Sleep(500);
+        }
+    }
+}

Tag 4/Aufgaben/Lösung_1v2/TankfüllstandLeuchte.txt

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+namespace Aufgaben;
+// *  Enum TankfüllstandLeuchte mit den Farben GRÜN, GELB und ROT.
+public enum TankfüllstandLeuchte
+{
+    Grün, Gelb, Rot
+}
+
+// *  void-Delegate TankfüllstandBeobachter mit Parameter vom Typ PKW.
+public delegate void TankfüllstandBeobachter(Pkw p);

Tag 4/Aufgaben/Lösung_2/Lösung_2.txt

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+/* Sie entwickeln eine Software zur Buchung von Reisen. Die Reisenden können ihre gebuchte Reise vor Reiseantritt stornieren. Dazu sollen zwei Algorithmen implementiert werden - ein kulanter Algorithmus und ein strenger Algorithmus. Beim Buchen der Reise wird einer der Algorithmen für die Stornogebühren ausgesucht, der Algorithmus könnte sich aber auch nachträglich noch ändern. Damit der Algorithmus leicht austauschbar ist, verwenden Sie das Strategy-Muster (hier aber über Delegates umgesetzt).
+ *
+ * Jede Reise hat einen Grundpreis und einen Reisebeginn.
+ * Es können für alle Reise-Arten die Anzahl der Tage bis zur Abreise bestimmt werden.
+ * Jede Reise-Art berechnet den Preis auf unterschiedliche Art.
+ * Die Reise wird in zwei Arten unterteilt. Die günstige Bronze-Reise und die teure Gold-Reise.
+ * Die Bronze-Reise kostet Grundpreis * 1.25, die Gold-Reise kostet Grundpreis * 1.75
+ *
+ * Jede Reise hat einen bestimmten Storno-Algorithmus.
+ * Es gibt den strengen Storno Algorithmus und den kulanten Storno Algorithmus.
+ * Eine Stornierung der Reise mit dem strengen Algorithmus kostet 25% der Reisekosten, wenn die Tage bis zur Abreise > 10 sind, sonst 75%.
+ * Die Stornierung mit dem kulanten Algorithmus kostet 25% der Reisekosten, wenn es noch mehr als ein Tag bis zur Reise sind, sonst 50%.
+ * Eine Bronze-Reise verwendet standardmäßig den strengen Algorithmus, eine Gold-Reise verwendet standardmäßig den kulanten Algorithmus.
+ *
+ * Erstellen Sie ein Klassendiagramm und testen Sie das Programm mit C#-Code.
+ */
+
+
+using System;
+
+namespace Lösungen
+{
+    class Lösung_2
+    {
+
+        public static void Main(String[] args)
+        {
+            BronzeReise sr = new BronzeReise(DateTime.Now.AddDays(8), 100);
+            GoldReise pr = new GoldReise(DateTime.Now.AddDays(8), 200);
+
+            Console.WriteLine("Standardreise Preis: " + sr.BerechnePreis());
+            Console.WriteLine("Standardreise Tage: " + sr.BestimmeTage());
+            Console.WriteLine("Standardreise Storno: " + sr.BerechneStorno());
+
+            Reise.StornoAlgorithmus stornoAlgorithmus = Reise.KulanterStornoAlgorithmus;
+            sr.SetStornoAlgorithmus(stornoAlgorithmus);
+            Console.WriteLine("Auf Kulanter Algorithmus wechseln...");
+            Console.WriteLine("Standardreise Storno: " + sr.BerechneStorno());
+
+            Console.WriteLine("Premiumreise Preis: " + pr.BerechnePreis());
+            Console.WriteLine("Premiumreise Storno: " + pr.BerechneStorno());
+        }
+
+    }
+}

Tag 4/Aufgaben/Lösung_2/Reise.txt

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+using System;
+
+public abstract class Reise
+{
+    // Passendes Delegate für die Storno-Algorithmen.
+    public delegate double StornoAlgorithmus(Reise reise);
+
+    // Algorithmen readonly, quasi Konstanten.
+    public static readonly StornoAlgorithmus StrengerStornoAlgorithmus = 
+        (reise) => reise.BestimmeTage() > 10 ? reise.BerechnePreis() * 0.25 : reise.BerechnePreis() * 0.75;
+
+    public static readonly StornoAlgorithmus KulanterStornoAlgorithmus = 
+        (reise) => reise.BestimmeTage() > 1 ? reise.BerechnePreis() * 0.25 : reise.BerechnePreis() * 0.5;
+
+    protected double grundPreis;
+    private readonly DateTime reiseBeginn;
+    private StornoAlgorithmus stornoAlgorithmus;
+
+    protected Reise(DateTime reiseBeginn, double grundPreis, StornoAlgorithmus stornoAlgorithmus)
+    {
+        this.reiseBeginn = reiseBeginn;
+        this.grundPreis = grundPreis;
+        this.stornoAlgorithmus = stornoAlgorithmus;
+    }
+
+    /// <summary>
+    /// Ermittelt die Anzahl Tage bis zum Reisebeginn.
+    /// </summary>
+    public int BestimmeTage()
+    {
+        return (reiseBeginn - DateTime.Now).Days;
+    }
+
+    
+    /// <summary>
+    /// Kalkuliert mit unterschiedlichen Algorithmen den Preis der Reise.
+    /// </summary>
+    public abstract double BerechnePreis();
+
+    /// <summary>
+    /// Setzt den Storno Algorithmus.
+    /// </summary>
+    public void SetStornoAlgorithmus(StornoAlgorithmus stornoAlgorithmus)
+    {
+        this.stornoAlgorithmus = stornoAlgorithmus;
+    }
+
+    /// <summary>
+    /// Berechnet die Stornogebühren und gibt diese zurück.
+    /// </summary>
+    public double BerechneStorno()
+    {
+        if (stornoAlgorithmus != null)
+            return stornoAlgorithmus.Invoke(this);
+        else return 0;
+    }
+}
+
+class GoldReise : Reise
+{
+    // Bei GoldReisen kommt der kulante Stornoalgorithmus zum Einsatz
+    public GoldReise(DateTime reiseBeginn, double grundPreis) : base (reiseBeginn, grundPreis, KulanterStornoAlgorithmus)
+    {
+    }
+
+    public override double BerechnePreis()
+    {
+        return grundPreis * 1.75;
+    }
+}
+
+class BronzeReise : Reise
+{
+    // Bei BronzeReisen kommt der strenge Stornoalgorithmus zum Einsatz (bei Stammkunden kann der Algorithmus auf den kulanten Stornoalgorithmus gesetzt werden)
+    public BronzeReise(DateTime reiseBeginn, double grundPreis) : base(reiseBeginn, grundPreis, StrengerStornoAlgorithmus)
+    {
+    }
+
+    
+    public override double BerechnePreis()
+    {
+        return grundPreis * 1.25;
+    }
+}
+

Tag 4/Aufgaben/Lösung_2v2/Aufgabe_2.txt

@@ -0,0 +1,35 @@
+using System;
+
+namespace Aufgaben;
+/* Sie entwickeln eine Software zur Buchung von Reisen. Die Reisenden können ihre gebuchte Reise vor Reiseantritt stornieren. Dazu sollen zwei Algorithmen implementiert werden - ein kulanter Algorithmus und ein strenger Algorithmus. Beim Buchen der Reise wird einer der Algorithmen für die Stornogebühren ausgesucht, der Algorithmus könnte sich aber auch nachträglich noch ändern. Damit der Algorithmus leicht austauschbar ist, verwenden Sie das Strategy-Muster (hier aber über Delegates umgesetzt).
+ *
+ *
+ * Jede Reise hat einen bestimmten Storno-Algorithmus.
+ * Da der Algorithmus beliebig getauscht werden können soll, ist er von der Reise entkoppelt.
+ * Es gibt den strengen Storno Algorithmus und den kulanten Storno Algorithmus.
+ *
+ * Eine Bronze-Reise verwendet standardmäßig den strengen Algorithmus, eine Gold-Reise verwendet standardmäßig den kulanten Algorithmus.
+ *
+ * Erstellen Sie ein Klassendiagramm und testen Sie das Programm mit C#-Code.
+ */
+public class Aufgabe_2
+{
+    public static void Main(string[] args)
+    {
+        BronzeReise br = new BronzeReise(DateTime.Now.AddDays(10), 100);
+        GoldReise gr = new GoldReise(DateTime.Now.AddDays(10), 200);
+
+        Console.WriteLine("Bronze Reise:");
+        Console.WriteLine(br.PreisBerechnen());
+        Console.WriteLine(br.TageBestimmen());
+        Console.WriteLine(br.BerechneStorno());
+        
+        br.SetStornoAlgorithmus(KulanterStornoAlgorithmus.StornoBerechnen);
+        Console.WriteLine(br.BerechneStorno());
+
+        Console.WriteLine("Gold Reise:");
+        Console.WriteLine(gr.PreisBerechnen());
+        Console.WriteLine(gr.TageBestimmen());
+        Console.WriteLine(gr.BerechneStorno());
+    }
+}

Tag 4/Aufgaben/Lösung_2v2/BronzeReise.txt

@@ -0,0 +1,16 @@
+using System;
+
+namespace Aufgaben;
+
+public class BronzeReise : Reise
+{
+    public BronzeReise(DateTime reisebeginn, double grundpreis) : base(reisebeginn, grundpreis)
+    {
+        stornoAlgorithmus = StrengerStornoAlgorithmus.StornoBerechnen;
+    }
+    
+    public override double PreisBerechnen()
+    {
+        return grundpreis * 1.25;
+    }
+}

Tag 4/Aufgaben/Lösung_2v2/GoldReise.txt

@@ -0,0 +1,16 @@
+using System;
+
+namespace Aufgaben;
+
+public class GoldReise : Reise
+{
+    public GoldReise(DateTime reisebeginn, double grundpreis) : base(reisebeginn, grundpreis)
+    {
+        stornoAlgorithmus = KulanterStornoAlgorithmus.StornoBerechnen;
+    }
+
+    public override double PreisBerechnen()
+    {
+        return grundpreis * 1.75;
+    }
+}

Tag 4/Aufgaben/Lösung_2v2/KulanterStornoAlgorithmus.txt

@@ -0,0 +1,12 @@
+namespace Aufgaben;
+/*
+ * Die Stornierung mit dem kulanten Algorithmus kostet 25% der Reisekosten, wenn es noch mehr als ein Tag bis zur Reise sind, sonst 50%.
+ */
+public class KulanterStornoAlgorithmus
+{
+    public static double StornoBerechnen(Reise reise)
+    {
+        double preis = reise.PreisBerechnen();
+        return reise.TageBestimmen() > 1 ? preis * 0.25 : preis * 0.5;
+    }
+}

Tag 4/Aufgaben/Lösung_2v2/Reise.txt

@@ -0,0 +1,42 @@
+using System;
+
+namespace Aufgaben;
+/*
+ * Jede Reise hat einen Grundpreis und einen Reisebeginn.
+ * Es können für alle Reise-Arten die Anzahl der Tage bis zur Abreise bestimmt werden.
+ * Jede Reise-Art berechnet den Preis auf unterschiedliche Art.
+ * Die Reise wird in zwei Arten unterteilt. Die günstige Bronze-Reise und die teure Gold-Reise.
+ * Die Bronze-Reise kostet Grundpreis * 1.25, die Gold-Reise kostet Grundpreis * 1.75
+ */
+public abstract class Reise
+{
+    private DateTime reisebeginn;
+    protected double grundpreis;
+
+    protected Func<Reise, double> stornoAlgorithmus;
+
+    public int TageBestimmen()
+    {
+        return reisebeginn.Subtract(DateTime.Now).Days;
+    }
+
+    public void SetStornoAlgorithmus(Func<Reise, double> algorithmus)
+    {
+        stornoAlgorithmus = algorithmus;
+    }
+
+    public double BerechneStorno()
+    {
+        return stornoAlgorithmus.Invoke(this);
+    }
+
+    public abstract double PreisBerechnen();
+
+    protected Reise(DateTime reisebeginn, double grundpreis)
+    {
+        this.reisebeginn = reisebeginn;
+        this.grundpreis = grundpreis;
+    }
+    
+    
+}

Tag 4/Aufgaben/Lösung_2v2/StrengerStornoAlgorithmus.txt

@@ -0,0 +1,12 @@
+namespace Aufgaben;
+/*
+ * Eine Stornierung der Reise mit dem strengen Algorithmus kostet 25% der Reisekosten, wenn die Tage bis zur Abreise > 10 sind, sonst 75%.
+ */
+public class StrengerStornoAlgorithmus
+{
+    public static double StornoBerechnen(Reise reise)
+    {
+        double preis = reise.PreisBerechnen();
+        return reise.TageBestimmen() > 10 ? preis * 0.25 : preis * 0.75;
+    }
+}

Tag 4/Aufgaben/Program.cs

@@ -0,0 +1,2 @@
+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

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Tag 4/Unterricht/Program.cs

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+// See https://aka.ms/new-console-template for more information
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+
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Tag 4/Unterricht/obj/Debug/net10.0/.NETCoreApp,Version=v10.0.AssemblyAttributes.cs

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+// <autogenerated />
+using System;
+using System.Reflection;
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Tag 4/Unterricht/obj/Debug/net10.0/Unterricht.AssemblyInfo.cs

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+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
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Tag 4/Unterricht/obj/Debug/net10.0/Unterricht.GlobalUsings.g.cs

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+// <auto-generated/>
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+global using System.Collections.Generic;
+global using System.IO;
+global using System.Linq;
+global using System.Net.Http;
+global using System.Threading;
+global using System.Threading.Tasks;

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+}

Tag 4/Unterricht/obj/project.nuget.cache

@@ -0,0 +1,8 @@
+{
+  "version": 2,
+  "dgSpecHash": "Lc9lGYoKBrE=",
+  "success": true,
+  "projectFilePath": "/home/max/Dokumente/Umschulung/CSharp/Tag 4/Unterricht/Unterricht.csproj",
+  "expectedPackageFiles": [],
+  "logs": []
+}

Tag 4/Unterricht/sealed.cs

@@ -0,0 +1,26 @@
+namespace Tag_4_Unterricht;
+
+public class Sealed
+{
+	public static void Main()
+	{
+		var data = new MyData(1);
+		data.subData = 10;
+	}
+
+	class MyData
+	{
+		public const string Greeting = "Hello";
+		public readonly int subData;
+
+		public MyData(int subData)
+		{
+			this.subData = subData;
+		}
+
+		public void NotAllowed()
+		{
+			subData = 10;
+		}
+	}
+}