1.\" $OpenBSD: modf.3,v 1.12 2013/06/05 03:39:22 tedu Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the American National Standards Committee X3, on Information 8.\" Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd $Mdocdate: June 5 2013 $ 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 SYNOPSIS 43.In math.h 44.Ft double 45.Fn modf "double value" "double *iptr" 46.Ft float 47.Fn modff "float value" "float *iptr" 48.Ft long double 49.Fn modfl "long double value" "long double *iptr" 50.Sh DESCRIPTION 51The 52.Fn modf 53function breaks the argument 54.Fa value 55into integral and fractional parts, each of which has the 56same sign as the argument. 57It stores the integral part as a 58.Li double 59in the object pointed to by 60.Fa iptr . 61The 62.Fn modff 63function is a single precision version of 64.Fn modf . 65The 66.Fn modfl 67function is an extended precision version of 68.Fn modf . 69.Sh RETURN VALUES 70The 71.Fn modf , 72.Fn modff 73and 74.Fn modfl 75functions return the signed fractional part of 76.Fa value . 77.Sh SEE ALSO 78.Xr frexp 3 , 79.Xr ldexp 3 80.Sh STANDARDS 81The 82.Fn modf 83function conforms to 84.St -ansiC . 85