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 March 4, 2005 40.Dt FREXP 3 41.Os 42.Sh NAME 43.Nm frexp , 44.Nm frexpf , 45.Nm frexpl 46.Nd convert floating-point number to fractional and integral components 47.Sh LIBRARY 48.Lb libm 49.Sh SYNOPSIS 50.In math.h 51.Ft double 52.Fn frexp "double value" "int *exp" 53.Ft float 54.Fn frexpf "float value" "int *exp" 55.Ft long double 56.Fn frexpl "long double value" "int *exp" 57.Sh DESCRIPTION 58The 59.Fn frexp , 60.Fn frexpf 61and 62.Fn frexpl 63functions break a floating-point number into a normalized 64fraction and an integral power of 2. 65They store the integer in the 66.Vt int 67object pointed to by 68.Fa exp . 69.Sh RETURN VALUES 70These functions return the value 71.Va x , 72such that 73.Va x 74is a 75.Vt double 76with magnitude in the interval 77.Bo 1/2 , 1 Pc 78or zero, and 79.Fa value 80equals 81.Va x 82times 2 raised to the power 83.Fa *exp . 84If 85.Fa value 86is zero, both parts of the result are zero. 87.Sh SEE ALSO 88.Xr ldexp 3 , 89.Xr math 3 , 90.Xr modf 3 91.Sh STANDARDS 92The 93.Fn frexp , 94.Fn frexpf , 95and 96.Fn frexpl 97functions conform to 98.St -isoC-99 . 99