How do you ask questions on answers on Stack Overflow?

Avoid asking followup questions in the comments. The answerer may well add material to their answer, but it is more likely to be ignored, eventually flagged, and deleted.

Instead, ask a new question referencing and linking to the older answer. This allows real answers to be posted to your question which can be voted on. (Comments can’t be down-voted).

You can post comments on answers if you want to ask questions about them but if they are not either your own answer or an answer to your question you need at least 50 reputation points to do it.

Why do I need 50 reputation to comment? What can I do instead?