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-.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd January 26, 2005
-.Dt FPCLASSIFY 3
-.Os
-.Sh NAME
-.Nm fpclassify , isfinite , isinf , isnan , isnormal
-.Nd "classify a floating-point number"
-.Sh LIBRARY
-.Lb libm
-.Sh SYNOPSIS
-.In math.h
-.Ft int
-.Fn fpclassify "real-floating x"
-.Ft int
-.Fn isfinite "real-floating x"
-.Ft int
-.Fn isinf "real-floating x"
-.Ft int
-.Fn isnan "real-floating x"
-.Ft int
-.Fn isnormal "real-floating x"
-.Sh DESCRIPTION
-The
-.Fn fpclassify
-macro takes an argument of
-.Fa x
-and returns one of the following manifest constants.
-.Bl -tag -width ".Dv FP_SUBNORMAL"
-.It Dv FP_INFINITE
-Indicates that
-.Fa x
-is an infinite number.
-.It Dv FP_NAN
-Indicates that
-.Fa x
-is not a number (NaN).
-.It Dv FP_NORMAL
-Indicates that
-.Fa x
-is a normalized number.
-.It Dv FP_SUBNORMAL
-Indicates that
-.Fa x
-is a denormalized number.
-.It Dv FP_ZERO
-Indicates that
-.Fa x
-is zero (0 or \-0).
-.El
-.Pp
-The
-.Fn isfinite
-macro returns a non-zero value if and only if its argument has
-a finite (zero, subnormal, or normal) value.
-The
-.Fn isinf ,
-.Fn isnan ,
-and
-.Fn isnormal
-macros return non-zero if and only if
-.Fa x
-is an infinity, NaN,
-or a non-zero normalized number, respectively.
-.Pp
-The symbol
-.Fn isnanf
-is provided as an alias to
-.Fn isnan
-for compatibility, and its use is deprecated.
-Similarly,
-.Fn finite
-and
-.Fn finitef
-are deprecated versions of
-.Fn isfinite .
-.Sh SEE ALSO
-.Xr isgreater 3 ,
-.Xr math 3 ,
-.Xr signbit 3
-.Sh STANDARDS
-The
-.Fn fpclassify ,
-.Fn isfinite ,
-.Fn isinf ,
-.Fn isnan ,
-and
-.Fn isnormal
-macros conform to
-.St -isoC-99 .
-.Sh HISTORY
-The
-.Fn fpclassify ,
-.Fn isfinite ,
-.Fn isinf ,
-.Fn isnan ,
-and
-.Fn isnormal
-macros were added in
-.Fx 5.1 .
-.Bx 3
-introduced
-.Fn isinf
-and
-.Fn isnan
-functions, which accepted
-.Vt double
-arguments; these have been superseded by the macros
-described above.