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