2004-06-07 08:05:36 +00:00
|
|
|
.\" Copyright (c) 2003, Steven G. Kargl
|
|
|
|
|
.\" All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
2005-04-08 01:24:08 +00:00
|
|
|
.Dd April 7, 2005
|
2004-06-07 08:05:36 +00:00
|
|
|
.Dt ROUND 3
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm round ,
|
2005-04-08 01:24:08 +00:00
|
|
|
.Nm roundf ,
|
|
|
|
|
.Nm roundl
|
2004-06-07 08:05:36 +00:00
|
|
|
.Nd round to nearest integral value
|
|
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libm
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In math.h
|
|
|
|
|
.Ft double
|
|
|
|
|
.Fn round "double x"
|
|
|
|
|
.Ft float
|
|
|
|
|
.Fn roundf "float x"
|
2005-06-15 19:04:04 +00:00
|
|
|
.Ft "long double"
|
2005-04-08 01:24:08 +00:00
|
|
|
.Fn roundl "long double x"
|
2004-06-07 08:05:36 +00:00
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
2005-04-08 01:24:08 +00:00
|
|
|
.Fn round ,
|
|
|
|
|
.Fn roundf ,
|
2004-06-07 08:05:36 +00:00
|
|
|
and
|
2005-04-08 01:24:08 +00:00
|
|
|
.Fn roundl
|
2004-06-07 08:05:36 +00:00
|
|
|
functions return the nearest integral value to
|
|
|
|
|
.Fa x ;
|
2005-01-11 20:50:51 +00:00
|
|
|
if
|
2004-06-07 08:05:36 +00:00
|
|
|
.Fa x
|
|
|
|
|
lies halfway between two integral values, then these
|
|
|
|
|
functions return the integral value with the larger
|
|
|
|
|
absolute value (i.e., they round away from zero).
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr ceil 3 ,
|
|
|
|
|
.Xr floor 3 ,
|
|
|
|
|
.Xr ieee 3 ,
|
2005-01-11 23:12:17 +00:00
|
|
|
.Xr lrint 3 ,
|
|
|
|
|
.Xr lround 3 ,
|
2004-06-07 08:05:36 +00:00
|
|
|
.Xr math 3 ,
|
2004-06-20 09:27:17 +00:00
|
|
|
.Xr rint 3 ,
|
|
|
|
|
.Xr trunc 3
|
2004-06-07 08:05:36 +00:00
|
|
|
.Sh STANDARDS
|
2005-04-08 01:24:08 +00:00
|
|
|
These functions conform to
|
2004-06-07 08:05:36 +00:00
|
|
|
.St -isoC-99 .
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
|
|
|
|
.Fn round
|
|
|
|
|
and
|
|
|
|
|
.Fn roundf
|
|
|
|
|
functions appeared in
|
|
|
|
|
.Fx 5.3 .
|
2005-04-08 01:24:08 +00:00
|
|
|
The
|
|
|
|
|
.Fn roundl
|
|
|
|
|
function appeared in
|
|
|
|
|
.Fx 6.0 .
|
