1.\" $NetBSD: frexp.3,v 1.3 1995/02/27 03:43:10 cgd 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. All advertising materials mentioning features or use of this software 19.\" must display the following acknowledgement: 20.\" This product includes software developed by the University of 21.\" California, Berkeley and its contributors. 22.\" 4. Neither the name of the University nor the names of its contributors 23.\" may be used to endorse or promote products derived from this software 24.\" without specific prior written permission. 25.\" 26.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36.\" SUCH DAMAGE. 37.\" 38.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93 39.\" 40.Dd June 4, 1993 41.Dt FREXP 3 42.Os 43.Sh NAME 44.Nm frexp 45.Nd convert floating-point number to fractional and integral components 46.Sh SYNOPSIS 47.Fd #include <math.h> 48.Ft double 49.Fn frexp "double value" "int *exp" 50.Sh DESCRIPTION 51The 52.Fn frexp 53function breaks a floating-point number into a normalized 54fraction and an integral power of 2. 55It stores the integer in the 56.Em int 57object pointed to by 58.Fa exp . 59.Sh RETURN VALUES 60The 61.Fn frexp 62function returns the value 63.Em x , 64such that 65.Em x 66is a 67.Em double 68with magnitude in the interval 69.Bq 1/2 , 1 70or 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 modf 3 , 82.Xr math 3 83.Sh STANDARDS 84The 85.Fn frexp 86function conforms to 87.St -ansiC . 88