1.\" $OpenBSD: modf.3,v 1.7 2008/12/12 00:12:47 martynas 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: December 12 2008 $ 35.Dt MODF 3 36.Os 37.Sh NAME 38.Nm modf , 39.Nm modff 40.Nd extract signed integral and fractional values from floating-point number 41.Sh SYNOPSIS 42.Fd #include <math.h> 43.Ft double 44.Fn modf "double value" "double *iptr" 45.Ft float 46.Fn modff "float value" "float *iptr" 47.Sh DESCRIPTION 48The 49.Fn modf 50function breaks the argument 51.Fa value 52into integral and fractional parts, each of which has the 53same sign as the argument. 54It stores the integral part as a 55.Li double 56in the object pointed to by 57.Fa iptr . 58The 59.Fn modff 60function is a single precision version of 61.Fn modf . 62.Sh RETURN VALUES 63The 64.Fn modf 65and 66.Fn modff 67functions 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 76function conforms to 77.St -ansiC . 78