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+// Ex. 4.18: ex04_18.cpp
+// What does this program do?
+#include <iostream>
+
+using std::cout; 
+using std::endl;
+
+int whatIsThis( int [], int );  // function prototype
+
+int main()
+{
+   const int arraySize = 10;
+   int a[ arraySize ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+
+   int result = whatIsThis( a, arraySize );
+
+   cout << "Result is " << result << endl;
+
+   return 0;  // indicates successful termination
+
+} // end main
+
+// What does this function do?
+int whatIsThis( int b[], int size )
+{
+   // base case
+   if ( size == 1 )
+      return b[ 0 ];
+
+   // recursive step
+   else
+      return b[ size - 1 ] + whatIsThis( b, size - 1 );
+
+} // end function whatIsThis
+
+/**************************************************************************
+ * (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.                     *
+ *************************************************************************/