def fibIter (int n)
	if (< n 2)
		return n
	end if
	decl int fib fibPrev num
	set fib (set fibPrev 1)
	for (set num 2) (< num n) (inc num)
		set fib (+ fib fibPrev)
		set fibPrev (- fib fibPrev)
	end for
	return fib
end