2005-01-11 23:12:17 +00:00
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.\" Copyright (c) 2005 David Schultz <das@FreeBSD.org>
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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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.Dd January 11, 2005
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.Dt LROUND 3
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.Os
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.Sh NAME
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.Nm llround ,
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.Nm llroundf ,
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.Nm lround ,
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.Nm lroundf
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2005-01-13 10:43:01 +00:00
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.Nd "convert to nearest integral value"
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2005-01-11 23:12:17 +00:00
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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 "long long"
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.Fn llround "double x"
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.Ft "long long"
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.Fn llroundf "float x"
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.Ft long
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.Fn lround "double x"
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.Ft long
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.Fn lroundf "float x"
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.Sh DESCRIPTION
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The
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.Fn lround
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function returns the integer nearest to its argument
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.Fa x ,
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rounding away from zero in halfway cases.
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If the rounded result is too large to be represented as a
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.Vt long
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value, an invalid exception is raised and the return value is undefined.
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Otherwise, if
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.Fa x
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is not an integer,
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.Fn lround
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may raise an inexact exception.
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When the rounded result is representable as a
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.Vt long ,
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the expression
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.Fn lround x
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is equivalent to
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.Po Vt long Pc Ns Fn round x
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(although the former may be more efficient).
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2005-01-11 23:12:17 +00:00
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.Pp
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The
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.Fn llround ,
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.Fn llroundf ,
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and
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.Fn lroundf
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functions differ from
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.Fn lround
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only in their input and output types.
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.Sh SEE ALSO
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.Xr lrint 3 ,
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.Xr math 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 llround ,
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.Fn llroundf ,
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.Fn lround ,
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and
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.Fn lroundf
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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 5.4 .
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