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.\" Copyright (c) 1985, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
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.\" $NetBSD: finite.3,v 1.2 2011/08/06 11:09:22 wiz Exp $
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.\"
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.Dd July 28, 2011
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.Dt FINITE 3
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.Os
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.Sh NAME
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.Nm finite ,
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.Nm finitef
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.Nd tests for finite values
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.Sh LIBRARY
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.Lb libm
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.Sh SYNOPSIS
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.In math.h
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.Ft int
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.Fn finite "double x"
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.Ft int
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.Fn finitef "float x"
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.Sh DESCRIPTION
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The
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.Fn finite
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function returns the value 1 when
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.Bd -ragged -offset indent
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\-\*(If \*(Lt
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.Fa x
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\*(Lt +\*(If.
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.Ed
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.Pp
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Otherwise a zero is returned
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(that is,
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.Pf \*(Ba Ns Fa x Ns \*(Ba
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= \*(If or
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.Fa x
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is \*(Na).
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.Sh SEE ALSO
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.Xr isfinite 3 ,
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.Xr math 3
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.Sh STANDARDS
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The described functions conform to
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.St -ieee754 .
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Note that unlike
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.Xr isfinite 3 ,
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neither function is present in the
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.Dv ISO
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C-language standards or in the
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.Dv IEEE
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.Dv POSIX
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standards.
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.Sh HISTORY
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The
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.Nm finite
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and
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.Fn finitef
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functions first appeared in
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.Bx 4.3 .
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