1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93 37.\" $FreeBSD$ 38.\" 39.Dd January 23, 2005 40.Dt FREXP 3 41.Os 42.Sh NAME 43.Nm frexp 44.Nd convert floating-point number to fractional and integral components 45.Sh LIBRARY 46.Lb libm 47.Sh SYNOPSIS 48.In math.h 49.Ft double 50.Fn frexp "double value" "int *exp" 51.Ft double 52.Fn frexpf "float value" "int *exp" 53.Sh DESCRIPTION 54The 55.Fn frexp 56and 57.Fn frexpf 58functions break a floating-point number into a normalized 59fraction and an integral power of 2. 60They store the integer in the 61.Vt int 62object pointed to by 63.Fa exp . 64.Sh RETURN VALUES 65These functions return the value 66.Va x , 67such that 68.Va x 69is a 70.Vt double 71with magnitude in the interval 72.Bo 1/2 , 1 Pc 73or zero, and 74.Fa value 75equals 76.Va x 77times 2 raised to the power 78.Fa *exp . 79If 80.Fa value 81is zero, both parts of the result are zero. 82.Sh SEE ALSO 83.Xr ldexp 3 , 84.Xr math 3 , 85.Xr modf 3 86.Sh STANDARDS 87The 88.Fn frexp 89and 90.Fn frexpf 91functions conform to 92.St -isoC-99 . 93