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diff --git a/Bachelor/Prog2/Z-Uebung/Teil4/main4.cpp b/Bachelor/Prog2/Z-Uebung/Teil4/main4.cpp
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+// Übung PG 2, Teil 4
+// inhomogeneous list for Shape-Objects (2nd version)
+// Author: Prinz / Kirch-Prinz / Weber
+// Date: 26.05.05
+
+#include <iostream>
+#include "shapeList.h"
+using namespace std;
+
+int main()
+{
+   cout << "\n\t ***  Eine Liste geometrischer Figuren  ***\n"
+        << endl;
+   ShapePtrList myShapes;
+   cout << myShapes.toString() << endl;  // print list
+
+   cout << "Elemente in die Liste einfuegen: " << endl;
+   // append at end of list:
+   myShapes.push_back( new Line( Point( 0, 0 ), Point( 2, 2 ) ) );
+   myShapes.push_back( new Rectangle( Point( -1, -1 ), 2, 2) );
+
+   // insert ellipse at front of list:
+   myShapes.push_front( new Ellipse( Point( 0, 0 ), 3, 1) );
+
+   Point vertices[] = { Point( 0, -3 ), Point( -3, 0 ), Point( 0, 3 ), Point( 3, 0 ) };
+   Shape* ptr = new Polygon( vertices, 4 );  // a rombus
+   // insert polygon as second element:
+   myShapes.insert( ++myShapes.begin(), ptr );
+
+   // a circle as last-but-one element:
+   ShapePtrList::iterator pos =  // position of circle
+     myShapes.insert( --myShapes.end(), new Circle( Point( 0, 0 ), 5 ) );
+   ( *pos )->scale( 0.7 );  // make this element smaller
+
+   cout << "Anzahl Elemente in der Liste: "
+        << myShapes.size() << endl;
+   cout << myShapes.toString() << endl;  // print list
+
+   cout << "Figur vor dem Kreis loeschen ... " << endl;
+   myShapes.erase( --pos );
+
+   cout << "und die zweite Figur (das Polygon) verschieben: " << endl;
+   pos = myShapes.begin();
+   ptr = *( ++pos );   // second element = pointer to polygon
+   ptr->move( 0, 3 );  // move upwards
+
+   cout << "Die veraenderte Liste: " << endl
+        << myShapes.toString();  // print list
+   cin.get();
+
+   cout << "Kopie der Liste anlegen "
+           "und Groesse der Figuren verdoppeln:" << endl;
+   ShapePtrList yourShapes( myShapes );  // use of copy constructor
+   yourShapes.scale( 2.0 );  // double size of figures
+   cout << yourShapes.toString() << endl;  // print new list
+
+   cout << "Die urspruengliche Liste ist unveraendert:\n"
+        << myShapes.toString() << endl;  // print old list
+
+   cout << "Zuweisung von Listen testen!\n"
+        << "Erste Figur (Ellipse) in der neuen Liste loeschen"
+        << endl;
+   yourShapes.pop_front();
+   cout << "und die Liste der urspruengliche Liste zuweisen:" << endl;
+   myShapes = yourShapes;  // assignment
+
+   cout << myShapes.toString();  // print result
+   cin.get();
+
+   return 0;
+}