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Negative zero equals minus one?

From: Marcin Borkowski
Subject: Negative zero equals minus one?
Date: Mon, 09 Feb 2015 19:13:11 +0100

Hi there,

Emacs just made my day.

(defun print-prefix-arg (arg)
  "Print the raw prefix argument and its numeric value in the echo area."
  (interactive "P")
  (message "Raw: %s, numeric: %s." arg (prefix-numeric-value arg)))

C-u - 0 M-x print-prefix-arg

Raw: -, numeric: -1.


(It is not irrational - see simple.el, function `digit-argument' and the
comment therein.  But it's still funny.)


Marcin Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University

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