2005-04-16 21:12:47 +00:00
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.\" Copyright (c) 2004, 2005 David Schultz <das@FreeBSD.org>
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2004-06-20 09:25:43 +00:00
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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2005-04-16 21:12:47 +00:00
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.Dd April 16, 2005
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2004-06-20 09:25:43 +00:00
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.Dt TRUNC 3
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.Os
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.Sh NAME
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.Nm trunc ,
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.Nm truncf ,
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.Nm truncl
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.Nd nearest integral value with magnitude less than or equal to |x|
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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 trunc "double x"
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.Ft float
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.Fn truncf "float x"
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.Ft "long double"
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.Fn truncl "long double x"
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.Sh DESCRIPTION
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The
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.Fn trunc ,
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.Fn truncf ,
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and
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.Fn truncl
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functions return the nearest integral value with magnitude less than
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or equal to
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.Pf | Fa x Ns | .
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They are equivalent to
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.Fn rint ,
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.Fn rintf ,
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and
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.Fn rintl ,
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respectively, in the
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.Dv FE_TOWARDZERO
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rounding mode.
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.Sh SEE ALSO
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.Xr ceil 3 ,
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.Xr fesetround 3 ,
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.Xr floor 3 ,
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.Xr math 3 ,
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.Xr nextafter 3 ,
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.Xr rint 3 ,
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.Xr round 3
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.Sh STANDARDS
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The
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.Fn trunc ,
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.Fn truncf ,
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and
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.Fn truncl
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functions conform to
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.St -isoC-99 .
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.Sh HISTORY
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These routines first appeared in
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.Fx 5.3 .
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