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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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.\" 4. Neither the name of the University nor the names of its contributors
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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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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
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.\" $FreeBSD$
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.\"
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2005-03-07 05:00:29 +00:00
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.Dd May 4, 2005
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2005-01-27 05:46:17 +00:00
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.Dt NEXTAFTER 3
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.Os
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.Sh NAME
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.Nm nextafter ,
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.Nm nextafterf ,
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.Nm nextafterl ,
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.Nm nexttoward ,
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.Nm nexttowardf ,
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.Nm nexttowardl
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.Nd next representable value
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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 double
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.Fn nextafter "double x" "double y"
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.Ft float
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.Fn nextafterf "float x" "float y"
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.Ft long double
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.Fn nextafterl "long double x" "long double y"
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.Ft double
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.Fn nexttoward "double x" "long double y"
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.Ft float
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.Fn nexttowardf "float x" "long double y"
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.Ft long double
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.Fn nexttowardl "long double x" "long double y"
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.Sh DESCRIPTION
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These functions
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return the next machine representable number from
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.Fa x
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in direction
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.Fa y .
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.Sh SEE ALSO
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.Xr ieee 3 ,
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.Xr math 3
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.Sh STANDARDS
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The
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.Fn nextafter ,
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.Fn nextafterf ,
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.Fn nextafterl ,
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.Fn nexttoward ,
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.Fn nexttowardf ,
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and
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.Fn nexttowardl
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routines conform to
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.St -isoC-99 .
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They implement the Nextafter function recommended by
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.St -ieee754 ,
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with the extension that
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.Fn nextafter +0.0, -0.0
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returns
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.Li -0.0 ,
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and
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.Fn nextafter -0.0, +0.0
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returns
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.Li +0.0 .
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.Sh HISTORY
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The
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.Fn nextafter
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function appeared in
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.Bx 4.3 ,
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and
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.Fn nextafterf
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appeared in
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.Fx 2.0 .
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