;;; 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.
+;; Copyright (C) 1990-1993, 2001-2011 Free Software Foundation, Inc.
;; Author: David Gillespie <daveg@synaptics.com>
;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
(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")
(if (eq (car-safe b) 'mod)
(if (equal mod (nth 2 b))
(setq b (nth 1 b))
- (math-reject-arg b "*Inconsistent modulos"))))
+ (math-reject-arg b "*Inconsistent modulus"))))
(setq mod (nth 2 b)
b (nth 1 b)))
(if (Math-messy-integerp mod)
(if w
(if (/= w bits)
(calc-record-why
- "*Warning: Modulo inconsistent with word size"))
+ "*Warning: Modulus inconsistent with word size"))
(setq w bits))
- (calc-record-why "*Warning: Modulo is not a power of 2"))
+ (calc-record-why "*Warning: Modulus is not a power of 2"))
(math-make-mod (if b
(funcall f a b w)
(funcall f a w))
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
;;; calc-bin.el ends here