add Programmyday form github

StudentenDatenbank/Datenbank.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Intrinsics.X86;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StudentenDatenbank
+{
+    internal class Datenbank
+    {
+        private Student[] studenten;
+
+        public Datenbank(int anzahl) 
+        { 
+            studenten = new Student[anzahl];
+        }
+        public bool AddStudent(Student student) 
+        {
+            for (int i = 0; i < studenten.Length; i++)
+            {
+                if (studenten[i] == null)
+                {
+                    studenten[i] = student;
+                    return true;
+                }
+            }
+            return false;
+        }
+        public bool RemoveStudent(Student student) 
+        {
+            for (int i = 0; i < studenten.Length; i++)
+            {
+                if (studenten[i] == student) 
+                {
+                    studenten[i] = null;
+                    return true;
+                }
+            }
+            return false;
+        }
+        public bool RemoveStudent (int martrieklNr)
+        {
+            for (int i = 0; i < studenten.Length; i++)
+            {
+                if (studenten[i] != null)
+                {
+                    if (studenten[i].GetMatrikelNr() == martrieklNr)
+                    {
+                        studenten[i] = null;
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+        public int CountStudents()
+        {
+            int cnt = 0;
+            for (int i = 0; i < studenten.Length; i++)
+            {
+                if (studenten[i] != null)
+                {
+                    cnt++;
+                }
+            }
+            return cnt;
+        }
+        public void PrintMe()
+        {
+            for (int i = 0; i < studenten.Length; i++)
+            {
+                if (studenten[i] != null)
+                {
+                    studenten[i].PrintMe();
+                }
+            }
+        }
+    }
+}