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diff --git a/Bachelor/Prog1/examples/ch06/Fig06_18_20/Fig06_20.cpp b/Bachelor/Prog1/examples/ch06/Fig06_18_20/Fig06_20.cpp
new file mode 100644
index 0000000..58f5bb9
--- /dev/null
+++ b/Bachelor/Prog1/examples/ch06/Fig06_18_20/Fig06_20.cpp
@@ -0,0 +1,82 @@
+// Fig. 6.20: fig06_20.cpp

+// Demonstrating the Time class set and get functions

+#include <iostream>

+

+using std::cout;

+using std::endl;

+

+// include definition of class Time from time3.h

+#include "time3.h"

+

+void incrementMinutes( Time &, const int );  // prototype

+

+int main()

+{

+   Time t;              // create Time object

+

+   // set time using individual set functions

+   t.setHour( 17 );     // set hour to valid value

+   t.setMinute( 34 );   // set minute to valid value

+   t.setSecond( 25 );   // set second to valid value

+

+   // use get functions to obtain hour, miunute and second

+   cout << "Result of setting all valid values:\n" 

+        << "  Hour: " << t.getHour()

+        << "  Minute: " << t.getMinute()

+        << "  Second: " << t.getSecond();

+

+   // set time using individual set functions

+   t.setHour( 234 );    // invalid hour set to 0

+   t.setMinute( 43 );   // set minute to valid value

+   t.setSecond( 6373 ); // invalid second set to 0

+

+   // display hour, minute and second after setting 

+   // invalid hour and second values

+   cout << "\n\nResult of attempting to set invalid hour and"

+        << " second:\n  Hour: " << t.getHour()

+        << "  Minute: " << t.getMinute()

+        << "  Second: " << t.getSecond() << "\n\n";

+

+   t.setTime( 11, 58, 0 );    // set time

+   incrementMinutes( t, 3 );  // increment t's minute by 3

+

+   return 0;

+

+} // end main

+

+// add specified number of minutes to a Time object

+void incrementMinutes( Time &tt, const int count )

+{

+   cout << "Incrementing minute " << count

+        << " times:\nStart time: ";

+   tt.printStandard();

+

+   for ( int i = 0; i < count; i++ ) {

+      tt.setMinute( ( tt.getMinute() + 1 ) % 60 );  

+

+      if ( tt.getMinute() == 0 )

+         tt.setHour( ( tt.getHour() + 1 ) % 24 );

+

+      cout << "\nminute + 1: ";

+      tt.printStandard();

+

+   } // end for

+

+   cout << endl;

+

+} // end function incrementMinutes

+

+/**************************************************************************

+ * (C) Copyright 1992-2002 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.                     *

+ *************************************************************************/

diff --git a/Bachelor/Prog1/examples/ch06/Fig06_18_20/Time3.cpp b/Bachelor/Prog1/examples/ch06/Fig06_18_20/Time3.cpp
new file mode 100644
index 0000000..7cf0176
--- /dev/null
+++ b/Bachelor/Prog1/examples/ch06/Fig06_18_20/Time3.cpp
@@ -0,0 +1,107 @@
+// Fig. 6.19: time3.cpp

+// Member-function definitions for Time class.

+#include <iostream>

+

+using std::cout;

+

+#include <iomanip>

+

+using std::setfill;

+using std::setw;

+

+// include definition of class Time from time3.h

+#include "time3.h"

+

+// constructor function to initialize private data;

+// calls member function setTime to set variables;

+// default values are 0 (see class definition)

+Time::Time( int hr, int min, int sec ) 

+{ 

+   setTime( hr, min, sec ); 

+

+} // end Time constructor

+

+// set hour, minute and second values

+void Time::setTime( int h, int m, int s )

+{

+   setHour( h );

+   setMinute( m );

+   setSecond( s );

+

+} // end function setTime

+

+// set hour value

+void Time::setHour( int h ) 

+{

+   hour = ( h >= 0 && h < 24 ) ? h : 0; 

+

+} // end function setHour

+

+// set minute value

+void Time::setMinute( int m )

+{ 

+   minute = ( m >= 0 && m < 60 ) ? m : 0; 

+

+} // end function setMinute

+

+// set second value

+void Time::setSecond( int s )

+{ 

+   second = ( s >= 0 && s < 60 ) ? s : 0; 

+

+} // end function setSecond

+

+// return hour value

+int Time::getHour() 

+{ 

+   return hour; 

+

+} // end function getHour

+

+// return minute value

+int Time::getMinute() 

+{

+   return minute; 

+

+} // end function getMinute

+

+// return second value

+int Time::getSecond() 

+{ 

+   return second;

+   

+} // end function getSecond

+

+// print Time in universal format

+void Time::printUniversal()

+{

+   cout << setfill( '0' ) << setw( 2 ) << hour << ":"

+        << setw( 2 ) << minute << ":"

+        << setw( 2 ) << second;

+

+} // end function printUniversal

+

+// print Time in standard format

+void Time::printStandard()

+{

+   cout << ( ( hour == 0 || hour == 12 ) ? 12 : hour % 12 )

+        << ":" << setfill( '0' ) << setw( 2 ) << minute

+        << ":" << setw( 2 ) << second 

+        << ( hour < 12 ? " AM" : " PM" );

+

+} // end function printStandard

+

+/**************************************************************************

+ * (C) Copyright 1992-2002 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.                     *

+ *************************************************************************/

diff --git a/Bachelor/Prog1/examples/ch06/Fig06_18_20/Time3.h b/Bachelor/Prog1/examples/ch06/Fig06_18_20/Time3.h
new file mode 100644
index 0000000..2f68d31
--- /dev/null
+++ b/Bachelor/Prog1/examples/ch06/Fig06_18_20/Time3.h
@@ -0,0 +1,50 @@
+// Fig. 6.18: time3.h

+// Declaration of class Time.

+// Member functions defined in time3.cpp

+

+// prevent multiple inclusions of header file

+#ifndef TIME3_H  

+#define TIME3_H 

+

+class Time {

+

+public:

+   Time( int = 0, int = 0, int = 0 );  // default constructor

+

+   // set functions

+   void setTime( int, int, int );  // set hour, minute, second

+   void setHour( int );   // set hour

+   void setMinute( int ); // set minute

+   void setSecond( int ); // set second

+

+   // get functions

+   int getHour();         // return hour

+   int getMinute();       // return minute

+   int getSecond();       // return second

+

+   void printUniversal(); // output universal-time format

+   void printStandard();  // output standard-time format

+

+private:

+   int hour;              // 0 - 23 (24-hour clock format)

+   int minute;            // 0 - 59

+   int second;            // 0 - 59

+

+}; // end clas Time

+

+#endif

+

+/**************************************************************************

+ * (C) Copyright 1992-2002 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.                     *

+ *************************************************************************/