104 lines
2.8 KiB
Groff
104 lines
2.8 KiB
Groff
.\" 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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.\" 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: @(#)rint.3 5.1 (Berkeley) 5/2/91
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.\" $FreeBSD$
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.\"
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.Dd January 13, 2008
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.Dt RINT 3
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.Os
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.Sh NAME
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.Nm nearbyint ,
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.Nm nearbyintf ,
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.Nm nearbyintl ,
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.Nm rint ,
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.Nm rintf ,
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.Nm rintl
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.Nd round to integral value in floating-point format
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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 nearbyint "double x"
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.Ft float
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.Fn nearbyintf "float x"
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.Ft long double
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.Fn nearbyintl "long double x"
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.Ft double
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.Fn rint "double x"
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.Ft float
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.Fn rintf "float x"
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.Ft long double
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.Fn rintl "long double x"
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.Sh DESCRIPTION
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The
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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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functions return the integral value nearest to
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.Fa x
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according to the prevailing rounding mode.
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These functions raise an inexact exception when the original argument
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is not an exact integer.
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.Pp
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The
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.Fn nearbyint ,
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.Fn nearbyintf ,
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and
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.Fn nearbyintl
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functions perform the same operation, except that they do not raise
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an inexact exception.
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.Sh SEE ALSO
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.Xr abs 3 ,
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.Xr ceil 3 ,
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.Xr fabs 3 ,
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.Xr fenv 3 ,
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.Xr floor 3 ,
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.Xr ieee 3 ,
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.Xr lrint 3 ,
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.Xr lround 3 ,
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.Xr math 3 ,
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.Xr round 3
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.Sh STANDARDS
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These functions conform to
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.St -isoC-99 .
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.Sh HISTORY
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A
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.Fn rint
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function appeared in
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.At v6 .
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The
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.Fn nearbyint
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and
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.Fn nearbyintf
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functions appeared in
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.Fx 5.3 ,
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and the long double variants were first available in
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.Fx 8.0 .
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