I tried to make a library, but I'm getting "Undefined variable" on B[], and "Type mismatch" on A[]. What gives? How can I use arrays on my library files? Either DIM or VAR keyword should work, but it doesn't in this case.

Try putting a instead of b, or make another DIM for b.

dim b is in slot 0. Taking it out gives me Type mismatch on A. It's like Dim A doesn't exist even though it should be global.

I was having this exact problem. This is a screenshot of the library, yes? So you're including it from some other program file? I found that I had to use EXEC "PRG1:LIB" instead of USE "PRG1:LIB". This allows the library to define its local variables. They remain in memory, but they can only be accessed by the library's functions. That should solve your A array.

As for your B array, I'm guessing it was defined in the program file that's using this library. Unfortunately, your library can't "see" any variables that were defined outside of it. Either you must pass B into INIT as an argument and work with it there, or you must define B in your library and set up COMMON functions that allow other files to access it.

Here's a conversation where I got help on the subject. https://miiverse.nintendo.net/posts/AYMHAAACAAADVHkmXGmS3w And if you haven't already, you can look at my library for an example of how it works. Public key [Q3KKVPDM]

Hi Ed. You got it perfect! Exec did the trick. Thanks. I was reading Raycast.lib, and it says USE 1, so I guess I was confused. Thanks for the help. Now to make my own library!

Library? Say what? Just wondering do you know how to change the sprites of the spooky Maze?

Sorry, it's too complicated for me. I'd sooner do a lightweight raycaster of my own than using calc84's full-featured one.

Oooh cool!