CREATE CALCULATER himself

CREATE CALCULATER 

@echo off
title  Calculator by Prakash
color 1f
:top
echo --------------------------------------------------------------
echo Welcome to Batch Calculator by Prakash
echo --------------------------------------------------------------
echo.
set /p add=
set /a answer=%add%
echo.
echo = %answer%%
echo --------------------------------------------------------------
pause
cls
echo Previous Answer: %answer%
goto top
pause
exit

• WRITE NOTEPAD this CODE
• save .BAT