# 3.5.11.3 BitLShift

## Description

Shift a given decimal number num left by the specified number of bits shift. It is proceeded as follows: firstly convert num into its binary representation, add 0 to the end of the binary, and then convert it back to the decimal number.

## Syntax

__int64 BitLShift( __int64 num, __int64 shift)

## Parameters

num

The number in the decimal representation. It must be a non-negative integer.

shift

The number of bits by which to shift num left. It should be a non-negative integer. If a negative value is given, it will return the same value as the absolute value of shift of the BitRShift function.

## Return

Return a decimal number shifted left by the specified number of bits.

## Example

EX1

BitLShift(100, 2) = ;  // returns 400
BitLShift(10, 4) = ;  // returns 160

EX21

i=hex(F1101010101);
j=hex(F2010101011);
Dec2hex(bitLShift(i,3),12)\$=;// 788808080808