I’ve always been curious… What programming language are DOS programs written in? For example, this program: http://keyhut.com/pos.htm
You can use the arrows on the keyboard to select options, type in things, press enter to do things…
At my work, all of our backend looks like DOS, the blue screen, you use the arrows on keyboard to select options… etc.
How could I create an interactive DOS program like that?
There were many languages out there for those sort of apps.
They include QBasic, Turbo Pascal, Turbo C++.
Here is a helpful page to get started : http://www.opus.co.tt/dave/program.htm. You may also want to google to find the language you’re interested in.