1.\" $NetBSD: modf.3,v 1.3 2017/02/01 15:57:47 abhinav 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.\" @(#)modf.3 8.1 (Berkeley) 6/4/93 35.\" 36.Dd March 7, 2016 37.Dt MODF 3 38.Os 39.Sh NAME 40.Nm modf , 41.Nm modff , 42.Nm modfl 43.Nd extract signed integral and fractional values from floating-point number 44.Sh LIBRARY 45.Lb libm 46.Sh SYNOPSIS 47.In math.h 48.Ft double 49.Fn modf "double value" "double *iptr" 50.Ft float 51.Fn modff "float value" "float *iptr" 52.Ft long double 53.Fn modfl "long double value" "long double *iptr" 54.Sh DESCRIPTION 55The 56.Fn modf 57function breaks the argument 58.Fa value 59into integral and fractional parts, each of which has the 60same sign as the argument. 61It stores the integral part as a 62.Em double 63in the object pointed to by 64.Fa iptr . 65.Sh RETURN VALUES 66The 67.Fn modf 68function returns 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 77function conforms to 78.St -ansiC . 79