e03aa09b61
Be explicit and use the general bracketing form plus symbols which are to be interpreted mathematically in this case. Complaint by: mdocml Reviewed by: ru Approved by: philip, ed (mentors)
95 lines
2.8 KiB
Groff
95 lines
2.8 KiB
Groff
.\" 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.
|
|
.\" 4. 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
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd March 4, 2005
|
|
.Dt FREXP 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm frexp ,
|
|
.Nm frexpf ,
|
|
.Nm frexpl
|
|
.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"
|
|
.Ft long double
|
|
.Fn frexpl "long double value" "int *exp"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn frexp ,
|
|
.Fn frexpf
|
|
and
|
|
.Fn frexpl
|
|
functions break a floating-point number into a normalized
|
|
fraction and an integral power of 2.
|
|
They store the integer in the
|
|
.Vt int
|
|
object pointed to by
|
|
.Fa exp .
|
|
.Sh RETURN VALUES
|
|
These functions return the value
|
|
.Va x ,
|
|
such that
|
|
.Va x
|
|
is a
|
|
.Vt double
|
|
with magnitude in the interval
|
|
.Eo [ 1/2 , 1 Ec )
|
|
or zero, and
|
|
.Fa value
|
|
equals
|
|
.Va 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 ,
|
|
.Fn frexpf ,
|
|
and
|
|
.Fn frexpl
|
|
functions conform to
|
|
.St -isoC-99 .
|