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-.\" Copyright (c) 1985, 1991 Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     from: @(#)ieee.3	6.4 (Berkeley) 5/6/91
-.\" $FreeBSD: src/lib/msun/man/ilogb.3,v 1.3 2005/11/17 13:00:00 ru Exp $
-.\"
-.Dd November 6, 2005
-.Dt ILOGB 3
-.Os
-.Sh NAME
-.Nm ilogb ,
-.Nm ilogbf ,
-.Nm ilogbl ,
-.Nm logb ,
-.Nm logbf
-.Nd extract exponent
-.Sh LIBRARY
-.Lb libm
-.Sh SYNOPSIS
-.In math.h
-.Ft int
-.Fn ilogb "double x"
-.Ft int
-.Fn ilogbf "float x"
-.Ft int
-.Fn ilogbl "long double x"
-.Ft double
-.Fn logb "double x"
-.Ft float
-.Fn logbf "float x"
-.Sh DESCRIPTION
-.Fn ilogb ,
-.Fn ilogbf
-and
-.Fn ilogbl
-return
-.Fa x Ns 's exponent
-in integer format.
-.Fn ilogb \*(Pm\*(If
-returns
-.Dv INT_MAX ,
-.Fn ilogb \*(Pm\*(Na
-returns
-.Dv FP_ILOGBNAN ,
-and
-.Fn ilogb 0
-returns
-.Dv FP_ILOGB0 .
-.Pp
-.Fn logb x
-and
-.Fn logbf x
-return
-.Fa x Ns 's exponent
-in floating\-point format with the same precision as
-.Fa x .
-.Fn logb \*(Pm\*(If
-returns +\*(If, and
-.Fn logb 0
-returns -\*(If with a division by zero exception.
-.Sh SEE ALSO
-.Xr frexp 3 ,
-.Xr ieee 3 ,
-.Xr math 3 ,
-.Xr scalbn 3
-.Sh STANDARDS
-The
-.Fn ilogb ,
-.Fn ilogbf ,
-.Fn ilogbl ,
-.Fn logb
-and
-.Fn logbf
-routines conform to
-.St -isoC-99 .
-.Fn logb
-and
-.Fn logbf
-implement the logb function recommended by
-.St -ieee754 .
-.Sh HISTORY
-The
-.Fn logb
-function appeared in
-.Bx 4.3 .
-The
-.Fn ilogb
-function appeared in
-.Fx 1.1.5 .
-The
-.Fn ilogbf
-and
-.Fn logbf
-functions appeared in
-.Fx 2.0 .
-The
-.Fn ilogbl
-function appeared in
-.Fx 5.4 .