programming/elisp/fibonacci.el

#!/usr/bin/emacs --script
(setq fibonacciCalls 0)
(defun fibonacci (n)
  "generate the nth fibonacci number"
  (setq fibonacciCalls (+ 1 fibonacciCalls))
  (cond
   ((eq n 0) nil)
   ((eq n 1) 0)
   ((eq n 2) 1)
   ((+ (fibonacci (- n 1)) (fibonacci (- n 2)) ))))


(princ (fibonacci 3))
(princ fibonacciCalls)
(print "")