Why is this not 0 on 50g or Prime?

[rprosperi]

(07-18-2018 12:45 AM)Valentin Albillo Wrote:  Mine too, +0 and -0 (which played an essential part in one of my S&SMCs), plus +Inf, -Inf, signaling NaNs and silent (i.e.: unsignaling) NaNs, all of which can be the real and/or imaginary part of a complex number.

Yes, I explored most of these when I first got my 71 in the 80's, particularly finding it interesting to fabricate programs to generate NaNs (both kinds), but also of course creating programs that could handle (and even DISPLAY/PRINT) answers that include Infinity, thus proving my Numerical Methods Professor wrong, having claimed that any good program spends as much code trapping and preventing such cases to avoid crashes, as the actual intended calculations!

But I somehow never noticed the -0 capability, or possibly did but then seeing no use for it, successfully forgot it over the years.

Anyhow, I am thrilled to continue to learn new things about my favorite machine, so thanks to you guys for this interesting discussion.