Hp 50g - "?" message and CAS bugs

[Carsen]

(11-03-2020 03:51 AM)ttw Wrote:  I also get "?" with SIGN(0). It seems like this should be "0" rather than undermined.

On page 3-223 of the AUR, it describes the command SIGN. It states that in exact mode, using SIGN on 0 will be returned as undefined ('?'). In approximate mode, using SIGN on 0 will return 0.

In short, this is by design. Although, it does not answer why it is designed this way.