@ECHO OFF
IF NOT "%OS%"=="Windows_NT" GOTO Syntax
IF      "%~1"==""           GOTO Syntax
IF NOT  "%~2"==""           GOTO Syntax

SETLOCAL ENABLEDELAYEDEXPANSION
SET /A Num = %~1
SET Bin=

:Loop
SET /A "BinTmp = Num %% 2"
SET /A Num /= 2
SET Bin=%BinTmp%%Bin%
IF %Num% GTR 0 GOTO Loop

ECHO.%Bin%

ENDLOCAL
GOTO:EOF


:Syntax
ECHO.
ECHO Num2Bin.bat,  Version 1.00 for Windows NT4 and later
ECHO Convert the specified number to binary
ECHO.
ECHO Usage:  NUM2BIN  number
ECHO.
ECHO Where:  number   is a decimal, hexadecimal or octal number
ECHO                  (0xnnn for hexadecimal, 0nnn for octal)
ECHO.
ECHO Note:   Non-numeric input will be treated as 0
ECHO.
ECHO Written by Rob van der Woude
ECHO http://www.robvanderwoude.com

IF "%OS%"=="Windows_NT" EXIT /B 1