scalb.md

description	title	ms.date	api_name	api_location	api_type	topic_type	f1_keywords	helpviewer_keywords
Learn more about: _scalb, _scalbf	_scalb, _scalbf	1/15/2021	_scalb _scalbf _o__scalb _o__scalbf	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-math-l1-1-0.dll	DLLExport	apiref	scalb _scalb _scalbf	exponential calculations _scalb function _scalbf function scalb function

_scalb, _scalbf

Scales argument by a power of 2.

Syntax

double _scalb(
   double x,
   long exp
);
float _scalbf(
   float x,
   long exp
); /* x64 only */

Parameters

x
Double-precision, floating-point value.

exp
Long integer exponent.

Return value

Returns an exponential value if successful. On overflow (depending on the sign of x), _scalb returns +/- HUGE_VAL; the errno variable is set to ERANGE.

For more information about this and other return codes, see errno, _doserrno, _sys_errlist, and _sys_nerr.

Remarks

The _scalb function calculates the value of x * 2^exp.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine	Required header
_scalb, _scalbf	<float.h>

For more compatibility information, see Compatibility.

See also

Math and floating-point support
ldexp