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Welcome to the Factorial in Lisp page! Here, you'll find the source code for this program as well as a description of how the program works.
(defun factorial (n)
(if (= n 0)
1
(* n (factorial (- n 1))) ) )
(defun maybe-pos-int (input)
(cond
((null input) nil)
((string= input "") nil)
((every #'digit-char-p input) (parse-integer input))
(t nil)))
(defparameter num (maybe-pos-int (cadr *posix-argv*)))
(cond
((null num) (write-line "Usage: please input a non-negative integer"))
(t (print (factorial num)))
)
Factorial in Lisp was written by:
If you see anything you'd like to change or update, please consider contributing.
Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 11 2020 06:48:59. The solution was first committed on Oct 01 2020 17:40:32. As a result, documentation below may be outdated.
No 'How to Implement the Solution' section available. Please consider contributing.
No 'How to Run the Solution' section available. Please consider contributing.