A Collection of Code Snippets in as Many Programming Languages as Possible
This project is maintained by TheRenegadeCoder
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.
(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))))
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