.\"	$OpenBSD: trunc.3,v 1.7 2011/07/21 07:52:08 jmc Exp $
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.\" Copyright (c) 2004, 2005 David Schultz <das@FreeBSD.org>
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.\" $FreeBSD: src/lib/msun/man/trunc.3,v 1.3 2005/06/15 19:04:04 ru Exp $
.\"
.Dd $Mdocdate: July 21 2011 $
.Dt TRUNC 3
.Os
.Sh NAME
.Nm trunc ,
.Nm truncf ,
.Nm truncl
.Nd "nearest integral value with magnitude less than or equal to |x|"
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn trunc "double x"
.Ft float
.Fn truncf "float x"
.Ft long double
.Fn truncl "long double x"
.Sh DESCRIPTION
The
.Fn trunc ,
.Fn truncf
and
.Fn truncl
functions return the nearest integral value with magnitude less than
or equal to
.Pf | Fa x Ns | .
They are equivalent to
.Fn rint ,
.Fn rintf
and
.Fn rintl
respectively, in the rounding towards zero mode.
.Sh SEE ALSO
.Xr ceil 3 ,
.Xr fesetround 3 ,
.Xr floor 3 ,
.Xr nextafter 3 ,
.Xr rint 3 ,
.Xr round 3
.Sh STANDARDS
The
.Fn trunc ,
.Fn truncf
and
.Fn truncl
functions conform to
.St -isoC-99 .