1.\" Copyright (c) 2004, 2005 David Schultz <das@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd April 16, 2005 28.Dt TRUNC 3 29.Os 30.Sh NAME 31.Nm trunc , 32.Nm truncf , 33.Nm truncl 34.Nd nearest integral value with magnitude less than or equal to |x| 35.Sh LIBRARY 36.Lb libm 37.Sh SYNOPSIS 38.In math.h 39.Ft double 40.Fn trunc "double x" 41.Ft float 42.Fn truncf "float x" 43.Ft "long double" 44.Fn truncl "long double x" 45.Sh DESCRIPTION 46The 47.Fn trunc , 48.Fn truncf , 49and 50.Fn truncl 51functions return the nearest integral value with magnitude less than 52or equal to 53.Pf | Fa x Ns | . 54They are equivalent to 55.Fn rint , 56.Fn rintf , 57and 58.Fn rintl , 59respectively, in the 60.Dv FE_TOWARDZERO 61rounding mode. 62.Sh SEE ALSO 63.Xr ceil 3 , 64.Xr fesetround 3 , 65.Xr floor 3 , 66.Xr math 3 , 67.Xr nextafter 3 , 68.Xr rint 3 , 69.Xr round 3 70.Sh STANDARDS 71The 72.Fn trunc , 73.Fn truncf , 74and 75.Fn truncl 76functions conform to 77.St -isoC-99 . 78.Sh HISTORY 79These routines first appeared in 80.Fx 5.3 . 81