How to format code for IEEE Journals

I'm not too sure where to ask this. If you think it would better fit into Electronics, I'll post there...

I'm working on a paper for IEEE Transactions on Computers, and I can't find any guidelines on how to format code (C++) that is included in the paper.

I found some other papers with short code snippets, and it looks like they just used Courier New for the font, but I'm not sure of the font size. Do I need to include line numbers? I haven't found any with long sections of code (so for something with 4 lines I wouldn't expect line numbers anyways).

If someone has published a paper with code in it in IEEE Trans, and could give me some advice, I would really really appreciate it.

Thanks!