How to Make a Calculator in Notepad

My version of this calculator below.

https://www.instructables.com/files/orig/FBI/JV2F/I697QT9F/FBIJV2FI697QT9F.txt

Open Note pad

Type this (you dont need spaces)

@echo off

setlocal EnableDelayedExpansion

mode 30,10

:calc

cls

echo Add = +

echo Subtract = -

echo Divide = /

echo Multiply = *

echo Put your question here:

set /p equ=

set /a equ=!equ!

cls

echo Answer:!equ!

pause
goto calc

Save as calculator.bat

(bat) - means batch file

a batch file is illegal to send over the internet so send as a text file...

or convert to an exe file which will make it an application.