@ECHO OFF
:: Exponentiation (positive integers only)
:: Usage: Exp num pow
:: E.g. EXP 2 10 = 1024
IF     "%~2"=="" EXIT /B 1
IF NOT "%~3"=="" EXIT /B 1

SETLOCAL ENABLEDELAYEDEXPANSION
SET /A Num = %~1
SET /A Pow = %~2
IF NOT %~1 EQU %Num% (ENDLOCAL & EXIT /B 1)
IF NOT %~2 EQU %Pow% (ENDLOCAL & EXIT /B 1)
IF %Num% LSS 0 (ENDLOCAL & EXIT /B 1)
IF %Pow% LSS 0 (ENDLOCAL & EXIT /B 1)
IF %Pow% EQU 0 (ECHO 1& ENDLOCAL & EXIT /B 0)
IF %Num% EQU 0 (ECHO 0& ENDLOCAL & EXIT /B 0)
SET Result=1
FOR /L %%A IN (1,1,%Pow%) DO SET /A Result *= %Num%
ECHO %Result%
ENDLOCAL