1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" 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 6.5 (Berkeley) 6/29/91 37.\" 38.Dd June 29, 1991 39.Dt FREXP 3 40.Os 41.Sh NAME 42.Nm frexp 43.Nd convert floating-point number to fractional and integral components 44.Sh SYNOPSIS 45.Fd #include <math.h> 46.Ft double 47.Fn frexp "double value" "int *exp" 48.Sh DESCRIPTION 49The 50.Fn frexp 51function breaks a floating-point number into a normalized 52fraction and an integral power of 2. 53It stores the integer in the 54.Em int 55object pointed to by 56.Fa exp . 57.Sh RETURN VALUES 58The 59.Fn frexp 60function returns the value 61.Em x , 62such that 63.Em x 64is a 65.Em double 66with magnitude in the interval 67.Bq 1/2 , 1 68or zero, and 69.Fa value 70equals 71.Em x 72times 2 raised to the power 73.Fa *exp . 74If 75.Fa value 76is zero, both parts of the result are zero. 77.Sh SEE ALSO 78.Xr ldexp 3 , 79.Xr modf 3 , 80.Xr math 3 81.Sh STANDARDS 82The 83.Fn frexp 84function conforms to 85.St -ansiC . 86