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. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93 33.\" 34.Dd March 4, 2005 35.Dt FREXP 3 36.Os 37.Sh NAME 38.Nm frexp , 39.Nm frexpf , 40.Nm frexpl 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 , 55.Fn frexpf 56and 57.Fn frexpl 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.Eo [ 1/2 , 1 Ec ) 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 , 89.Fn frexpf , 90and 91.Fn frexpl 92functions conform to 93.St -isoC-99 . 94