Projektdateien hinzufügen.

BeispielKomposition/BeispielKomposition.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

BeispielKomposition/Building.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeispielKomposition
+{
+    internal class Building
+    {
+        private string name;
+        private Floor[] floors;
+
+        public Building(string name, int floors)
+        {
+            this.name = name;
+            this.floors = new Floor[floors];
+            for (int i = 0; i < this.floors.Length; i++)
+            {
+                this.floors[i] = new Floor(i);
+            }
+        }
+        public void PrintInfos()
+        {
+            Console.WriteLine($"Gebäude {name}:");
+            foreach  (Floor floor in floors)
+            {
+                Console.WriteLine("Etage " + floor.GetFloorid());
+            }
+        }
+    }
+}

BeispielKomposition/Floor.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeispielKomposition
+{
+    internal class Floor
+    {
+        private int floorid;
+
+        public Floor(int floorid) 
+        { this.floorid = floorid; }
+        public int GetFloorid() { return floorid; }
+    }
+}

BeispielKomposition/Program.cs

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+namespace BeispielKomposition
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Building b1 = new Building ("Trump-Tower", 15);
+
+            b1.PrintInfos();
+        }
+    }
+}