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diff --git a/Bachelor/Prog1/examples/ch05/Ex05_21.cpp b/Bachelor/Prog1/examples/ch05/Ex05_21.cpp
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+// Ex. 5.21: ex05_21.cpp

+// What does this program do?

+#include <iostream>

+

+using std::cout;

+using std::cin;

+using std::endl;

+

+void mystery1( char *, const char * );  // prototype

+

+int main()

+{

+   char string1[ 80 ];

+   char string2[ 80 ];

+

+   cout << "Enter two strings: ";

+   cin >> string1 >> string2;

+   mystery1( string1, string2 );

+   cout << string1 << endl;

+

+   return 0;  // indicates successful termination

+

+} // end main

+

+// What does this function do?

+void mystery1( char *s1, const char *s2 )

+{

+   while ( *s1 != '\0' )

+      ++s1;

+

+   for ( ; *s1 = *s2; s1++, s2++ )

+      ;   // empty statement

+

+} // end function mystery1

+

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

+ * (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.                     *

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