libm/man/rint.3

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.\"     from: @(#)rint.3	5.1 (Berkeley) 5/2/91
.\" $FreeBSD: src/lib/msun/man/rint.3,v 1.11 2005/01/11 23:12:17 das Exp $
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.Dd July 5, 2004
.Dt RINT 3
.Os
.Sh NAME
.Nm nearbyint ,
.Nm nearbyintf ,
.Nm rint ,
.Nm rintf
.Nd round to integral value in floating-point format
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn nearbyint "double x"
.Ft float
.Fn nearbyintf "float x"
.Ft double
.Fn rint "double x"
.Ft float
.Fn rintf "float x"
.Sh DESCRIPTION
The
.Fn rint
and the
.Fn rintf
functions return the integral value nearest to
.Fa x
according to the prevailing rounding mode.
These functions raise an inexact exception when the original argument
is not an exact integer.
.Pp
The
.Fn nearbyint
and
.Fn nearbyintf
functions perform the same operation, except that they do not raise
an inexact exception.
.Sh SEE ALSO
.Xr abs 3 ,
.Xr ceil 3 ,
.Xr fabs 3 ,
.Xr fenv 3 ,
.Xr floor 3 ,
.Xr ieee 3 ,
.Xr lrint 3 ,
.Xr lround 3 ,
.Xr math 3 ,
.Xr round 3
.Sh STANDARDS
The
.Fn nearbyint ,
.Fn nearbyintf ,
.Fn rint ,
and
.Fn rintf
functions conform to
.St -isoC-99 .
.Sh HISTORY
A
.Fn rint
function appeared in
.At v6 .
The
.Fn nearbyint
and
.Fn nearbyintf
functions appeared in
.Fx 5.3 .