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.\" 4. 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.\" $FreeBSD$ 34.\" 35.Dd March 29, 2008 36.Dt MODF 3 37.Os 38.Sh NAME 39.Nm modf , 40.Nm modff , 41.Nm modfl 42.Nd extract signed integral and fractional values from floating-point number 43.Sh LIBRARY 44.Lb libm 45.Sh SYNOPSIS 46.In math.h 47.Ft double 48.Fn modf "double value" "double *iptr" 49.Ft float 50.Fn modff "float value" "float *iptr" 51.Ft long double 52.Fn modfl "long double value" "long double *iptr" 53.Sh DESCRIPTION 54The 55.Fn modf , 56.Fn modff , 57and 58.Fn modfl 59functions break the argument 60.Fa value 61into integral and fractional parts, each of which has the 62same sign as the argument. 63It stores the integral part as a 64floating point number 65in the object pointed to by 66.Fa iptr . 67.Sh RETURN VALUES 68These functions return the signed fractional part of 69.Fa value . 70.Sh SEE ALSO 71.Xr frexp 3 , 72.Xr ldexp 3 , 73.Xr math 3 74.Sh STANDARDS 75The 76.Fn modf , 77.Fn modff , 78and 79.Fn modfl 80functions conform to 81.St -isoC-99 . 82