RosettaCodeData/Task/Fibonacci-sequence/Common-Lisp/fibonacci-sequence-5.lisp
2014-01-17 05:34:36 +00:00

4 lines
134 B
Common Lisp

(defun fibonacci-tail-recursive ( n &optional (a 0) (b 1))
(if (= n 0)
a
(fibonacci-tail-recursive (- n 1) b (+ a b))))