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;;; float-sup.el --- define some constants useful for floating point numbers.
;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; Code:
;; Provide a meaningful error message if we are running on
;; bare (non-float) emacs.
(if (fboundp 'atan)
nil
(error "Floating point was disabled at compile time"))
;; provide an easy hook to tell if we are running with floats or not.
;; define pi and e via math-lib calls. (much less prone to killer typos.)
(defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...).")
;; It's too inconvenient to make `e' a constant because it's used as
;; a temporary variable all the time.
(defvar e (exp 1) "The value of e (2.7182818...).")
;; Careful when editing this file ... typos here will be hard to spot.
;; (defconst pi 3.14159265358979323846264338327
;; "The value of Pi (3.14159265358979323846264338327...)")
(defconst degrees-to-radians (/ pi 180.0)
"Degrees to radian conversion constant.")
(defconst radians-to-degrees (/ 180.0 pi)
"Radian to degree conversion constant.")
;; these expand to a single multiply by a float when byte compiled
(defmacro degrees-to-radians (x)
"Convert ARG from degrees to radians."
(list '* (/ pi 180.0) x))
(defmacro radians-to-degrees (x)
"Convert ARG from radians to degrees."
(list '* (/ 180.0 pi) x))
(provide 'lisp-float-type)
;;; float-sup.el ends here
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