;;; calc-bin.el --- binary functions for Calc
;; Copyright (C) 1990, 1991, 1992, 1993, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
;; Author: David Gillespie <daveg@synaptics.com>
;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
;; 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
(calc-change-mode '(calc-word-size calc-previous-modulo)
(list n (math-power-of-2 (math-abs n)))
calc-leading-zeros)))
+ (setq math-2-word-size (math-power-of-2 (math-abs n)))
+ (setq math-half-2-word-size (math-power-of-2 (1- (math-abs n))))
+ (calc-do-refresh)
+ (calc-refresh-evaltos)
(if (< n 0)
- (message "Binary word size is %d bits (2's complement)" (- n))
+ (message "Binary word size is %d bits (two's complement)" (- n))
(message "Binary word size is %d bits" n))))
;;; d-prefix mode commands.
-(defun calc-radix (n)
+(defun calc-radix (n &optional arg)
(interactive "NDisplay radix (2-36): ")
(calc-wrapper
(if (and (>= n 2) (<= n 36))
(progn
- (calc-change-mode 'calc-number-radix n t)
+ (calc-change-mode
+ (list 'calc-number-radix 'calc-twos-complement-mode)
+ (list n (or arg (calc-is-option))) t)
;; also change global value so minibuffer sees it
(setq-default calc-number-radix calc-number-radix))
(setq n calc-number-radix))
- (message "Number radix is %d" n)))
+ (if calc-twos-complement-mode
+ (message "Number radix is %d, two's complement mode is on." n)
+ (message "Number radix is %d" n))))
(defun calc-decimal-radix ()
(interactive)
(calc-radix 10))
-(defun calc-binary-radix ()
- (interactive)
- (calc-radix 2))
+(defun calc-binary-radix (&optional arg)
+ (interactive "P")
+ (calc-radix 2 arg))
-(defun calc-octal-radix ()
- (interactive)
- (calc-radix 8))
+(defun calc-octal-radix (&optional arg)
+ (interactive "P")
+ (calc-radix 8 arg))
-(defun calc-hex-radix ()
- (interactive)
- (calc-radix 16))
+(defun calc-hex-radix (&optional arg)
+ (interactive "P")
+ (calc-radix 16 arg))
(defun calc-leading-zeros (n)
(interactive "P")
calc-number-radix))))))
math-radix-float-cache))))))))
+;;; Two's complement mode
+
+(defun math-format-twos-complement (a)
+ "Format an integer in two's complement mode."
+ (let* (;(calc-leading-zeros t)
+ (overflow nil)
+ (negative nil)
+ (num
+ (cond
+ ((or (eq a 0)
+ (and (Math-integer-posp a)))
+ (if (integerp a)
+ (math-format-radix a)
+ (math-format-bignum-radix (cdr a))))
+ ((Math-integer-negp a)
+ (let ((newa (math-add a math-2-word-size)))
+ (if (integerp newa)
+ (math-format-radix newa)
+ (math-format-bignum-radix (cdr newa))))))))
+ (let* ((calc-internal-prec 6)
+ (digs (math-compute-max-digits (math-abs calc-word-size)
+ calc-number-radix))
+ (len (length num)))
+ (if (< len digs)
+ (setq num (concat (make-string (- digs len) ?0) num))))
+ (when calc-group-digits
+ (setq num (math-group-float num)))
+ (concat
+ (number-to-string calc-number-radix)
+ "##"
+ num)))
+
(provide 'calc-bin)
-;;; arch-tag: f6dba7bc-53b2-41ae-919c-c266ab0ca8b3
+;; arch-tag: f6dba7bc-53b2-41ae-919c-c266ab0ca8b3
;;; calc-bin.el ends here