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78 lines
2.3 KiB
Plaintext
78 lines
2.3 KiB
Plaintext
NAME
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digits - return number of "decimal" digits in an integral part
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SYNOPSIS
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digits(x [,b])
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TYPES
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x real
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b integer >= 2, defaults to 10
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return integer
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DESCRIPTION
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Returns number of digits in the standard base-b representation
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when x is truncated to an integer and the sign is ignored.
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To be more precise: when abs(int(x)) > 0, this function returns
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the value 1 + ilog(x, b). When abs(int(x)) == 0, then this
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function returns the value 1.
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If omitted, b is assumed to be 10. If given, b must be an
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integer > 1.
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One should remember these special cases:
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digits(12.3456) == 2 computes with the integer part only
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digits(-1234) == 4 computes with the absolute value only
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digits(0) == 1 specical case
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digits(-0.123) == 1 combination of all of the above
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EXAMPLE
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; print digits(100), digits(23209), digits(2^72)
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3 5 22
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; print digits(0), digits(1), digits(-1)
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1 1 1
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; print digits(-1234), digits(12.3456), digits(107.207)
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4 2 3
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; print digits(17^463-1, 17), digits(10000, 100), digits(21701, 2)
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3, 15 14
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LIMITS
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b > 1
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LINK LIBRARY
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long qdigits(NUMBER *q, ZVALUE base)
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SEE ALSO
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digit, places
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## Copyright (C) 1999-2003 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## @(#) $Revision: 30.1 $
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## @(#) $Id: digits,v 30.1 2007/03/16 11:10:42 chongo Exp $
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## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/digits,v $
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##
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## Under source code control: 1995/10/03 10:40:01
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## File existed as early as: 1995
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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