////   This file contains the C++ code from Program 3.3 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm03_03.cpp//unsigned int Fibonacci (unsigned int n){    int previous = -1;    int result = 1;    for (unsigned int i = 0; i <= n; ++i)    {	int const sum = result + previous;	previous = result;	result = sum;    }    return result;}