Even Odd in Lisp

Published on 28 April 2022 (Updated: 25 September 2022)

Even Odd in Lisp

Welcome to the Even Odd in Lisp page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

(defun even-odd (x)
   (cond
     ((evenp x) "Even")
     ((oddp x) "Odd")))

(defun maybe-int (input)
  (cond
    ((null input) nil)
    ((string= input "") nil)
    ((every #'digit-char-p (string-left-trim "-" input)) (parse-integer input))
    (t nil)))

(defparameter num (maybe-int (cadr *posix-argv*)))
(cond
  ((null num) (write-line "Usage: please input a number"))
  (t (write-line (even-odd num))))

Even Odd in Lisp was written by:

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

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