1.\" Copyright (c) 2004 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 June 20, 2004 28.Dt TRUNC 3 29.Os 30.Sh NAME 31.Nm trunc , 32.Nm truncf 33.Nd nearest integral value with magnitude less than or equal to |x| 34.Sh LIBRARY 35.Lb libm 36.Sh SYNOPSIS 37.In math.h 38.Ft double 39.Fn trunc "double x" 40.Ft float 41.Fn truncf "float x" 42.Sh DESCRIPTION 43The 44.Fn trunc 45and 46.Fn truncf 47functions return the nearest integral value with magnitude less than 48or equal to 49.Pf | Fa x Ns | . 50They are equivalent to 51.Fn rint 52and 53.Fn rintf , 54respectively, in the 55.Dv FE_TOWARDZERO 56rounding mode. 57.Sh SEE ALSO 58.Xr ceil 3 , 59.Xr fesetround 3 , 60.Xr floor 3 , 61.Xr math 3 , 62.Xr nextafter 3 , 63.Xr rint 3 , 64.Xr round 3 65.Sh STANDARDS 66The 67.Fn trunc 68and 69.Fn truncf 70functions conform to 71.St -isoC-99 . 72.Sh HISTORY 73These routines first appeared in 74.Fx 5.3 . 75