**scalb**

power of radix (OBSOLETE)
SYNOPSIS
#include <math.h>
double scalb(double x, double exp);
float scalbf(float x, double exp);
long double scalbl(long double x, double exp);
Link with -lm.
Feature Test Macro Requirements for glibc (see **feature_test_macros(7)**):
scalb():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
scalbf(), scalbl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
DESCRIPTION
These functions multiply their first argument x by FLT_RADIX (probably
2) to the power of exp, that is:
x * FLT_RADIX ** exp
The definition of FLT_RADIX can be obtained by including <float.h>.
RETURN VALUE
On success, these functions return x * FLT_RADIX ** exp.
If x or exp is a NaN, a NaN is returned.
If x is positive infinity (negative infinity), and exp is not negative
infinity, positive infinity (negative infinity) is returned.
If x is +0 (-0), and exp is not positive infinity, +0 (-0) is returned.
If x is zero, and exp is positive infinity, a domain error occurs, and
a NaN is returned.
If x is an infinity, and exp is negative infinity, a domain error
occurs, and a NaN is returned.
If the result overflows, a range error occurs, and the functions return
HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with a sign the same
as x.
If the result underflows, a range error occurs, and the functions
return zero, with a sign the same as x.
ERRORS
See **math_error(7)** for information on how to determine whether an error
has occurred when calling these functions.
These functions do not set errno.
CONFORMING TO
scalb() is specified in POSIX.1-2001, but marked obsolescent.
POSIX.1-2008 removes the specification of scalb(), recommending the use
of **scalbln(3)**, **scalblnf(3)**, or **scalblnl(3)** instead. The scalb() func-
tion is from 4.3BSD.
scalbf() and scalbl() are unstandardized; scalbf() is nevertheless
present on several other systems
SEE ALSO
**ldexp(3)**, **scalbln(3)**
COLOPHON
This page is part of release 3.35 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://man7.org/linux/man-pages/.
2010-09-20 **SCALB(3)**

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