Create Calculator from NOTEPAD

paste below given code to note pad and save it as anything.bat
Copy the code :


@echo off
title Batch Calculator by 3gkiller.blogpot.com
color 1f
:top
echo --------------------------------------------------------------
echo Welcome to Batch Calculator by 3gkiller.blogspot.com
echo --------------------------------------------------------------
echo.
set /p udefine=
set /a udefine=%udefine%
echo.
echo = %udefine%
echo --------------------------------------------------------------
pause
cls
echo Previous Answer: %udefine%
goto top
pause
exit