8 lines
258 B
Common Lisp
8 lines
258 B
Common Lisp
(defun fib (number)
|
|
"Fibonacci sequence function."
|
|
(if (< number 0)
|
|
(error "Error. The number entered: ~A is negative" number)
|
|
(recursive ((n number) (a 0) (b 1))
|
|
(if (= n 0)
|
|
a
|
|
(recurse (- n 1) b (+ a b))))))
|