NAME
    ilog10 - floor of logarithm to base 10

SYNOPSIS
    ilog10(x)

TYPES
    x		nonzero real

    return	integer

DESCRIPTION
    Returns the greatest integer n for which 10^n <= x.

EXAMPLE
    ; print ilog10(7), ilog10(77.7), ilog10(777), ilog10(.00777), ilog10(-1e27)
    0 1 2 -3 27

LIMITS
    none

LINK LIBRARY
    long qilog10(NUMBER *q)

SEE ALSO
    ilog, ilogn, ilog2, ln, log, log2, logn

## Copyright (C) 1999,2023  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.
##
## Under source code control:	1995/10/03 10:40:02
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/