scalb, scalbf, scalbl — multiply floating-point number by integral power of radix (OBSOLETE)
||long double x,|
|long double exp
These functions multiply their first argument
FLT_RADIX (probably 2) to the power of
exp, that is:
x * FLT_RADIX ** exp
The definition of
can be obtained by including
On success, these functions return
exp is a NaN, a NaN is
x is positive
infinity (negative infinity), and
exp is not negative infinity,
positive infinity (negative infinity) is returned.
x is +0
is not positive infinity, +0 (−0) is returned.
x is zero, and
exp is positive
infinity, a domain error occurs, and a NaN is returned.
x is an
negative infinity, a domain error occurs, and a NaN is
If the result overflows, a range error occurs, and the
HUGE_VALL, respectively, with a sign the
If the result underflows, a range error occurs, and the
functions return zero, with a sign the same as
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
The following errors can occur:
xis 0, and
expis positive infinity, or
xis positive infinity and
expis negative infinity and the other argument is not a NaN
An invalid floating-point exception (
FE_INVALID) is raised.
An overflow floating-point exception (
FE_OVERFLOW) is raised.
An underflow floating-point exception (
FE_UNDERFLOW) is raised.
These functions do not set
For an explanation of the terms used in this section, see attributes(7).
scalb() is specified in
POSIX.1-2001, but marked obsolescent. POSIX.1-2008 removes
the specification of
recommending the use of scalbln(3), scalblnf(3), or scalblnl(3) instead. The
scalb() function is from
scalbl() are unstandardized;
scalbf() is nevertheless present on several
This page is part of release 4.07 of the Linux
man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
Copyright 2004 Andries Brouwer <aebcwi.nl>.
and Copyright 2008, Linux Foundation, written by Michael Kerrisk
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.