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+// Fig. 3.15: fig03_15.cpp

+// Recursive fibonacci function.

+#include <iostream>

+

+using std::cout;

+using std::cin;

+using std::endl;

+

+unsigned long fibonacci( unsigned long ); // function prototype

+

+int main()

+{

+   unsigned long result, number;

+

+   // obtain integer from user

+   cout << "Enter an integer: ";

+   cin >> number;

+

+   // calculate fibonacci value for number input by user

+   result = fibonacci( number );

+

+   // display result

+   cout << "Fibonacci(" << number << ") = " << result << endl;

+

+   return 0;  // indicates successful termination

+

+} // end main

+

+// recursive definition of function fibonacci

+unsigned long fibonacci( unsigned long n )

+{

+   // base case

+   if ( n == 0 || n == 1 )  

+      return n;

+

+   // recursive step

+   else             

+      return fibonacci( n - 1 ) + fibonacci( n - 2 );

+

+} // end function fibonacci

+

+

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

+ * (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.                     *

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