86 lines
2.7 KiB
Groff
86 lines
2.7 KiB
Groff
|
.\" $NetBSD: frexp.3,v 1.2 2010/04/29 08:35:03 joerg Exp $
|
||
|
|
.\"
|
||
|
|
.\" Copyright (c) 1991, 1993
|
||
|
|
.\" The Regents of the University of California. All rights reserved.
|
||
|
|
.\"
|
||
|
|
.\" This code is derived from software contributed to Berkeley by
|
||
|
|
.\" the American National Standards Committee X3, on Information
|
||
|
|
.\" Processing Systems.
|
||
|
|
.\"
|
||
|
|
.\" Redistribution and use in source and binary forms, with or without
|
||
|
|
.\" modification, are permitted provided that the following conditions
|
||
|
|
.\" are met:
|
||
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer.
|
||
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
||
|
|
.\" documentation and/or other materials provided with the distribution.
|
||
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
||
|
|
.\" may be used to endorse or promote products derived from this software
|
||
|
|
.\" without specific prior written permission.
|
||
|
|
.\"
|
||
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
.\" SUCH DAMAGE.
|
||
|
|
.\"
|
||
|
|
.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93
|
||
|
|
.\"
|
||
|
|
.Dd March 21, 2006
|
||
|
|
.Dt FREXP 3
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm frexp
|
||
|
|
.Nd convert floating-point number to fractional and integral components
|
||
|
|
.Sh LIBRARY
|
||
|
|
.Lb libm
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.In math.h
|
||
|
|
.Ft double
|
||
|
|
.Fn frexp "double value" "int *exp"
|
||
|
|
.Ft float
|
||
|
|
.Fn frexpf "float value" "int *exp"
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Fn frexp
|
||
|
|
function breaks a floating-point number into a normalized
|
||
|
|
fraction and an integral power of 2.
|
||
|
|
It stores the integer in the
|
||
|
|
.Em int
|
||
|
|
object pointed to by
|
||
|
|
.Fa exp .
|
||
|
|
.Sh RETURN VALUES
|
||
|
|
The
|
||
|
|
.Fn frexp
|
||
|
|
function returns the value
|
||
|
|
.Em x ,
|
||
|
|
such that
|
||
|
|
.Em x
|
||
|
|
is a
|
||
|
|
.Em double
|
||
|
|
with magnitude in the interval [1/2, 1) or zero, and
|
||
|
|
.Fa value
|
||
|
|
equals
|
||
|
|
.Em x
|
||
|
|
times 2 raised to the power
|
||
|
|
.Fa *exp .
|
||
|
|
If
|
||
|
|
.Fa value
|
||
|
|
is zero, both parts of the result are zero.
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr ldexp 3 ,
|
||
|
|
.Xr math 3 ,
|
||
|
|
.Xr modf 3
|
||
|
|
.Sh STANDARDS
|
||
|
|
The
|
||
|
|
.Fn frexp
|
||
|
|
function conforms to
|
||
|
|
.St -ansiC .
|