1.\" $NetBSD: frexp.3,v 1.4 2015/09/10 12:30:08 wiz 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.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93 35.\" 36.Dd September 10, 2015 37.Dt FREXP 3 38.Os 39.Sh NAME 40.Nm frexp 41.Nd convert floating-point number to fractional and integral components 42.Sh LIBRARY 43.Lb libm 44.Sh SYNOPSIS 45.In math.h 46.Ft double 47.Fn frexp "double value" "int *exp" 48.Ft float 49.Fn frexpf "float value" "int *exp" 50.Ft long double 51.Fn frexpl "long double value" "int *exp" 52.Sh DESCRIPTION 53The 54.Fn frexp 55function breaks a floating-point number into a normalized 56fraction and an integral power of 2. 57It stores the integer in the 58.Em int 59object pointed to by 60.Fa exp . 61.Sh RETURN VALUES 62The 63.Fn frexp 64function returns the value 65.Em x , 66such that 67.Em x 68is a 69.Em double 70with magnitude in the interval [1/2, 1) or zero, and 71.Fa value 72equals 73.Em x 74times 2 raised to the power 75.Fa *exp . 76If 77.Fa value 78is zero, both parts of the result are zero. 79.Sh SEE ALSO 80.Xr ldexp 3 , 81.Xr math 3 , 82.Xr modf 3 83.Sh STANDARDS 84The 85.Fn frexp 86function conforms to 87.St -ansiC . 88