**scalbn**

ing-point number by integral power of radix
SYNOPSIS
#include <math.h>
double scalbln(double x, long int exp);
float scalblnf(float x, long int exp);
long double scalblnl(long double x, long int exp);
double scalbn(double x, int exp);
float scalbnf(float x, int exp);
long double scalbnl(long double x, int exp);
Link with -lm.
Feature Test Macro Requirements for glibc (see **feature_test_macros(7)**):
scalbln(), scalblnf(), scalblnl():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
scalbn(), scalbnf(), scalbnl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
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 is a NaN, a NaN is returned.
If x is positive infinity (negative infinity), positive infinity (nega-
tive infinity) is returned.
If x is +0 (-0), +0 (-0) 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 first appeared in glibc in version 2.1.
ATTRIBUTES
Multithreading (see **pthreads(7)**)
The scalbn(), scalbnf(), scalbnl(), scalbln(), scalblnf(), and scal-
blnl() functions are thread-safe.
CONFORMING TO
C99, POSIX.1-2001.
NOTES
These functions differ from the obsolete functions described in
**scalb(3)** in the type of their second argument. The functions described
on this page have a second argument of an integral type, while those in
**scalb(3)** have a second argument of type double.
If FLT_RADIX equals 2 (which is usual), then scalbn() is equivalent to
**ldexp(3)**.
SEE ALSO
**ldexp(3)**, **scalb(3)**
COLOPHON
This page is part of release 3.54 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2013-06-21 **SCALBLN(3)**

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