scalbl

```SYNOPSIS
#include <math.h>

double scalb(double x, double exp);
float scalbf(float x, float exp);
long double scalbl(long double x, long double exp);

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:

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.

The following errors can occur:

ATTRIBUTES
For   an   explanation   of   the  terms  used  in  this  section,  see
attributes(7).

+-----------------------------+---------------+---------+
|Interface                    | Attribute     | Value   |
+-----------------------------+---------------+---------+
|scalb(), scalbf(), scalbl()  | Thread safety | MT-Safe |
+-----------------------------+---------------+---------+
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