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.Dd March 4, 2005 33.Dt FREXP 3 34.Os 35.Sh NAME 36.Nm frexp , 37.Nm frexpf , 38.Nm frexpl 39.Nd convert floating-point number to fractional and integral components 40.Sh LIBRARY 41.Lb libm 42.Sh SYNOPSIS 43.In math.h 44.Ft double 45.Fn frexp "double value" "int *exp" 46.Ft float 47.Fn frexpf "float value" "int *exp" 48.Ft long double 49.Fn frexpl "long double value" "int *exp" 50.Sh DESCRIPTION 51The 52.Fn frexp , 53.Fn frexpf 54and 55.Fn frexpl 56functions break a floating-point number into a normalized 57fraction and an integral power of 2. 58They store the integer in the 59.Vt int 60object pointed to by 61.Fa exp . 62.Sh RETURN VALUES 63These functions return the value 64.Va x , 65such that 66.Va x 67is a 68.Vt double 69with magnitude in the interval 70.Eo [ 1/2 , 1 Ec ) 71or zero, and 72.Fa value 73equals 74.Va x 75times 2 raised to the power 76.Fa *exp . 77If 78.Fa value 79is zero, both parts of the result are zero. 80.Sh SEE ALSO 81.Xr ldexp 3 , 82.Xr math 3 , 83.Xr modf 3 84.Sh STANDARDS 85The 86.Fn frexp , 87.Fn frexpf , 88and 89.Fn frexpl 90functions conform to 91.St -isoC-99 . 92