158f0484fSRodney W. Grimes.\" Copyright (c) 1991, 1993 258f0484fSRodney W. Grimes.\" The Regents of the University of California. All rights reserved. 358f0484fSRodney W. Grimes.\" 458f0484fSRodney W. Grimes.\" This code is derived from software contributed to Berkeley by 558f0484fSRodney W. Grimes.\" the American National Standards Committee X3, on Information 658f0484fSRodney W. Grimes.\" Processing Systems. 758f0484fSRodney W. Grimes.\" 858f0484fSRodney W. Grimes.\" Redistribution and use in source and binary forms, with or without 958f0484fSRodney W. Grimes.\" modification, are permitted provided that the following conditions 1058f0484fSRodney W. Grimes.\" are met: 1158f0484fSRodney W. Grimes.\" 1. Redistributions of source code must retain the above copyright 1258f0484fSRodney W. Grimes.\" notice, this list of conditions and the following disclaimer. 1358f0484fSRodney W. Grimes.\" 2. Redistributions in binary form must reproduce the above copyright 1458f0484fSRodney W. Grimes.\" notice, this list of conditions and the following disclaimer in the 1558f0484fSRodney W. Grimes.\" documentation and/or other materials provided with the distribution. 16*fbbd9655SWarner Losh.\" 3. Neither the name of the University nor the names of its contributors 1758f0484fSRodney W. Grimes.\" may be used to endorse or promote products derived from this software 1858f0484fSRodney W. Grimes.\" without specific prior written permission. 1958f0484fSRodney W. Grimes.\" 2058f0484fSRodney W. Grimes.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2158f0484fSRodney W. Grimes.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2258f0484fSRodney W. Grimes.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2358f0484fSRodney W. Grimes.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2458f0484fSRodney W. Grimes.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2558f0484fSRodney W. Grimes.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2658f0484fSRodney W. Grimes.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2758f0484fSRodney W. Grimes.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2858f0484fSRodney W. Grimes.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2958f0484fSRodney W. Grimes.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3058f0484fSRodney W. Grimes.\" SUCH DAMAGE. 3158f0484fSRodney W. Grimes.\" 32a8af59b5SDavid Schultz.Dd March 4, 2005 3358f0484fSRodney W. Grimes.Dt FREXP 3 3458f0484fSRodney W. Grimes.Os 3558f0484fSRodney W. Grimes.Sh NAME 36a8af59b5SDavid Schultz.Nm frexp , 37a8af59b5SDavid Schultz.Nm frexpf , 38a8af59b5SDavid Schultz.Nm frexpl 3958f0484fSRodney W. Grimes.Nd convert floating-point number to fractional and integral components 4025bb73e0SAlexey Zelkin.Sh LIBRARY 416f1dd8edSDavid Schultz.Lb libm 4258f0484fSRodney W. Grimes.Sh SYNOPSIS 4332eef9aeSRuslan Ermilov.In math.h 4458f0484fSRodney W. Grimes.Ft double 4558f0484fSRodney W. Grimes.Fn frexp "double value" "int *exp" 46a8af59b5SDavid Schultz.Ft float 476f1dd8edSDavid Schultz.Fn frexpf "float value" "int *exp" 48a8af59b5SDavid Schultz.Ft long double 49a8af59b5SDavid Schultz.Fn frexpl "long double value" "int *exp" 5058f0484fSRodney W. Grimes.Sh DESCRIPTION 5158f0484fSRodney W. GrimesThe 52a8af59b5SDavid Schultz.Fn frexp , 536f1dd8edSDavid Schultz.Fn frexpf 54a8af59b5SDavid Schultzand 55a8af59b5SDavid Schultz.Fn frexpl 566f1dd8edSDavid Schultzfunctions break a floating-point number into a normalized 5758f0484fSRodney W. Grimesfraction and an integral power of 2. 586f1dd8edSDavid SchultzThey store the integer in the 595c564baeSRuslan Ermilov.Vt int 6058f0484fSRodney W. Grimesobject pointed to by 6158f0484fSRodney W. Grimes.Fa exp . 6258f0484fSRodney W. Grimes.Sh RETURN VALUES 636f1dd8edSDavid SchultzThese functions return the value 645c564baeSRuslan Ermilov.Va x , 6558f0484fSRodney W. Grimessuch that 665c564baeSRuslan Ermilov.Va x 6758f0484fSRodney W. Grimesis a 685c564baeSRuslan Ermilov.Vt double 6958f0484fSRodney W. Grimeswith magnitude in the interval 70e03aa09bSUlrich Spörlein.Eo [ 1/2 , 1 Ec ) 7158f0484fSRodney W. Grimesor zero, and 7258f0484fSRodney W. Grimes.Fa value 7358f0484fSRodney W. Grimesequals 745c564baeSRuslan Ermilov.Va x 7558f0484fSRodney W. Grimestimes 2 raised to the power 7658f0484fSRodney W. Grimes.Fa *exp . 7758f0484fSRodney W. GrimesIf 7858f0484fSRodney W. Grimes.Fa value 7958f0484fSRodney W. Grimesis zero, both parts of the result are zero. 8058f0484fSRodney W. Grimes.Sh SEE ALSO 8158f0484fSRodney W. Grimes.Xr ldexp 3 , 8275141cc9SWolfram Schneider.Xr math 3 , 8375141cc9SWolfram Schneider.Xr modf 3 8458f0484fSRodney W. Grimes.Sh STANDARDS 8558f0484fSRodney W. GrimesThe 86a8af59b5SDavid Schultz.Fn frexp , 87a8af59b5SDavid Schultz.Fn frexpf , 886f1dd8edSDavid Schultzand 89a8af59b5SDavid Schultz.Fn frexpl 906f1dd8edSDavid Schultzfunctions conform to 916f1dd8edSDavid Schultz.St -isoC-99 . 92