Ans before minus problem [Beginner Alert]

[Steve Simpkin]

(03-24-2020 11:22 PM)ijabbott Wrote:  I suppose the '+/-' key would have been labelled '(-)' if it wasn't for the need to support RPN.

Yes '(-)' is what most calculator manufacturers currently use for their sign change key.

HP used 'CHS' (Change Sign) for many years. HP changed the key label to '+/-' in 1990 with the introduction of the HP-48SX and appear to have used that symbol on newer models ever since.

TI used '+/-' for this key for many years until around 1990 when they switched to '(-)' with the introduction of the TI-81 graphing calculator and appear to have used that symbol on newer models ever since.

Early Sharp and Casio models used '+/-' for this key until they also switched to '(-)'.