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diff --git a/Bachelor/Prog1/examples/elevator/door.cpp b/Bachelor/Prog1/examples/elevator/door.cpp
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+// Fig. 7.36: door.cpp
+// Member-function definitions for class Door.
+#include <iostream>
+
+using std::cout;
+using std::endl;
+
+#include "door.h"      // Door class definition
+#include "person.h"    // Person class definition
+#include "floor.h"     // Floor class definition
+#include "elevator.h"  // Elevator class definition
+
+// constructor
+Door::Door() 
+   : open( false )  // initialize open to false
+{ 
+   cout << "door constructed" << endl; 
+
+} // end Door constructor
+
+// destructor
+Door::~Door() 
+{
+   cout << "door destructed" << endl; 
+
+} // end ~Door destructor
+
+// open the door
+void Door::openDoor( Person * const passengerPtr, 
+   Person * const nextPassengerPtr, Floor &currentFloor, 
+   Elevator &elevator ) 
+{ 
+   if ( !open ) {  // if door is not open, open door
+      open = true; 
+   
+      cout << "elevator opens its door on floor "
+           << currentFloor.getNumber() << endl;
+
+      // if passenger is in elevator, tell person to leave
+      if ( passengerPtr != 0 ) {
+         passengerPtr->exitElevator( currentFloor, elevator );
+         delete passengerPtr; // passenger leaves simulation
+
+      } // end if
+
+      // if passenger waiting to enter elevator, 
+      // tell passenger to enter
+      if ( nextPassengerPtr != 0 )
+         nextPassengerPtr->enterElevator( 
+            elevator, currentFloor );
+
+   } // end outer if
+
+} // end function openDoor
+
+// close the door
+void Door::closeDoor( const Floor &currentFloor ) 
+{
+   if ( open ) {  // if door is open, close door
+      open = false; 
+      cout << "elevator closes its door on floor "
+           << currentFloor.getNumber() << endl;
+
+   } // end if
+
+} // end function closeDoor
+
+/**************************************************************************
+ * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice      *
+ * Hall. All Rights Reserved.                                             *
+ *                                                                        *
+ * DISCLAIMER: The authors and publisher of this book have used their     *
+ * best efforts in preparing the book. These efforts include the          *
+ * development, research, and testing of the theories and programs        *
+ * to determine their effectiveness. The authors and publisher make       *
+ * no warranty of any kind, expressed or implied, with regard to these    *
+ * programs or to the documentation contained in these books. The authors *
+ * and publisher shall not be liable in any event for incidental or       *
+ * consequential damages in connection with, or arising out of, the       *
+ * furnishing, performance, or use of these programs.                     *
+ *************************************************************************/