scalb.md

title	ms.date	api_name	api_location	api_type	topic_type	f1_keywords	helpviewer_keywords	ms.assetid
_scalb, _scalbf	04/05/2018	_scalb _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	148cf5a8-b405-44bf-a1f0-7487adba2421

_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 _doserrno, errno, _sys_errlist, and _sys_nerr.

Remarks

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

Requirements

Routine	Required header
_scalb, _scalbf	<float.h>

For more compatibility information, see Compatibility.

See also

Floating-Point Support
ldexp