* negative subtraction
@ 2021-09-27 1:33 Emanuel Berg via Users list for the GNU Emacs text editor
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From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-09-27 1:33 UTC (permalink / raw)
To: help-gnu-emacs
;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;; http://user.it.uu.se/~embe8573/emacs-init/negative-subtraction.el
;;; https://dataswamp.org/~incal/emacs-init/negative-subtraction.el
(require 'cl-lib)
(require 'parse-time)
(defun negative-subtract (a b)
(let*((a-nums (number-to-list a))
(b-nums (number-to-list b)) )
(cl-loop
for i in a-nums
for j in b-nums
collect (- i j) )))
;; (negative-subtract 8888 7777) ; (1 1 1 1)
(defun number-to-list (n)
(cl-loop
for d across (prin1-to-string n)
collect (cl-digit-char-p d) ))
;; (number-to-list 1234) ; (1 2 3 4)
--
underground experts united
https://dataswamp.org/~incal
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2021-09-27 1:33 negative subtraction Emanuel Berg via Users list for the GNU Emacs text editor
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