mirror of
https://github.com/lcn2/calc.git
synced 2025-08-19 01:13:27 +03:00
71 lines
2.2 KiB
Plaintext
71 lines
2.2 KiB
Plaintext
NAME
|
|
btrunc - truncate a value to a number of binary places
|
|
|
|
SYNOPSIS
|
|
btrunc(x [,plcs])
|
|
|
|
TYPES
|
|
x real
|
|
plcs integer, defaults to zero
|
|
|
|
return real
|
|
|
|
DESCRIPTION
|
|
Truncate x to plcs binary places, rounding if necessary towards zero,
|
|
i.e. btrunc(x, plcs) is a multiple of 2^-plcs and the remainder
|
|
x - btrunc(x, plcs) is either zero or has the same sign as x and
|
|
absolute value less than 2^-plcs. Here plcs may be positive, zero or
|
|
negative.
|
|
|
|
Except that it is defined only for real x, btrunc(x, plcs) is equivalent
|
|
to bround(x, plcs, 2). btrunc(x,0) and btrunc(x) are equivalent to
|
|
int(x).
|
|
|
|
EXAMPLE
|
|
; print btrunc(pi()), btrunc(pi(), 10)
|
|
3 3.140625
|
|
|
|
; print btrunc(3.3), btrunc(3.7), btrunc(3.3, 2), btrunc(3.7, 2)
|
|
3 3 3.25 3.5
|
|
|
|
; print btrunc(-3.3), btrunc(-3.7), btrunc(-3.3, 2), btrunc(-3.7, 2)
|
|
-3 -3 -3.25 -3.5
|
|
|
|
; print btrunc(55.123, -4), btrunc(-55.123, -4)
|
|
48 -48
|
|
|
|
LIMITS
|
|
abs(j) < 2^31
|
|
|
|
LINK LIBRARY
|
|
NUMBER *qbtrunc(NUMBER *x, *j)
|
|
|
|
SEE ALSO
|
|
bround, int, round, trunc
|
|
|
|
## Copyright (C) 1999 Landon Curt Noll
|
|
##
|
|
## Calc is open software; you can redistribute it and/or modify it under
|
|
## the terms of the version 2.1 of the GNU Lesser General Public License
|
|
## as published by the Free Software Foundation.
|
|
##
|
|
## Calc 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 Lesser General
|
|
## Public License for more details.
|
|
##
|
|
## A copy of version 2.1 of the GNU Lesser General Public License is
|
|
## distributed with calc under the filename COPYING-LGPL. You should have
|
|
## received a copy with calc; if not, write to Free Software Foundation, Inc.
|
|
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
##
|
|
## @(#) $Revision: 30.1 $
|
|
## @(#) $Id: btrunc,v 30.1 2007/03/16 11:10:42 chongo Exp $
|
|
## @(#) $Source: /usr/local/src/bin/calc/help/RCS/btrunc,v $
|
|
##
|
|
## Under source code control: 1994/09/30 00:44:27
|
|
## File existed as early as: 1994
|
|
##
|
|
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
|
|
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
|