RosettaCodeData/Task/Fibonacci-sequence/Common-Lisp/fibonacci-sequence-2.lisp

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Common Lisp
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2023-07-01 11:58:00 -04:00
(defun fibonacci (n)
(let ((a 0) (b 1) (c n))
(loop for i from 2 to n do
(setq c (+ a b)
a b
b c))
c))