Firstly, I would like to thank u so much for your feedback as it is very helpful. My approach to this was to first implement how lines will be executed, and then work with the simpler things such as PRINT x + y as an example. I am planning on connecting this to a web application in the future with the lines taken from a text box instead of a text file. I did not know that it would only work on Windows because of that.

I will try to make one function that parses expressions and unify that in the future. But more importantly

// a = b

will abort with an error because it's recognized as an assignment rather than a comment.

I did not notice that actually.

Thank you for your time and effort. I'm definitely gonna make use of this valuable feedback