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+// Exercise 3.50: ex03_50.cpp
+// What does this program do?
+#include <iostream>
+
+using std::cout;
+using std::cin;
+using std::endl;
+
+int mystery( int, int );  // function prototype
+      
+int main()
+{
+   int x, y;
+   
+   cout << "Enter two integers: ";
+   cin >> x >> y;
+   cout << "The result is " << mystery( x, y ) << endl;
+
+   return 0;  // indicates successful termination
+
+} // end main
+   
+// Parameter b must be a positive
+// integer to prevent infinite recursion
+int mystery( int a, int b )
+{
+   // base case
+   if ( b == 1 )
+      return a;
+
+   // recursive step
+   else
+      return a + mystery( a, b - 1 );
+
+} // end function mystery
+
+
+/**************************************************************************
+ * (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.                     *
+ *************************************************************************/