1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)modf.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/gen/modf.3,v 1.3.2.4 2003/03/13 18:05:37 trhodes Exp $ 34.\" $DragonFly: src/lib/libc/gen/modf.3,v 1.2 2003/06/17 04:26:42 dillon Exp $ 35.\" 36.Dd June 4, 1993 37.Dt MODF 3 38.Os 39.Sh NAME 40.Nm modf 41.Nd extract signed integral and fractional values from floating-point number 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In math.h 46.Ft double 47.Fn modf "double value" "double *iptr" 48.Sh DESCRIPTION 49The 50.Fn modf 51function breaks the argument 52.Fa value 53into integral and fractional parts, each of which has the 54same sign as the argument. 55It stores the integral part as a 56.Vt double 57in the object pointed to by 58.Fa iptr . 59.Sh RETURN VALUES 60The 61.Fn modf 62function returns the signed fractional part of 63.Fa value . 64.Sh SEE ALSO 65.Xr frexp 3 , 66.Xr ldexp 3 , 67.Xr math 3 68.Sh STANDARDS 69The 70.Fn modf 71function conforms to 72.St -isoC . 73