this post was submitted on 30 Oct 2024
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Science Memes

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[–] lud@lemm.ee 11 points 10 hours ago* (last edited 9 hours ago) (2 children)

XNOR (Exclusive NOR) is the opposite of XOR (Exclusive OR)

A way to remember XOR is "must have one or the other but not both" XNOR is the opposite so it's "must have both or none" so both inputs must be 1 or 0.

XNOR or XOR is very common in homes with staircases so that you can turn on and off the light in the staircase regardless of which floor you are on.

If you google staircase switches, you will be told that they mostly use XOR but according to the wiring diagrams they use XNOR.

[–] humanspiral@lemmy.ca 1 points 9 hours ago (1 children)

XNOR is the opposite so it’s “must have both”

so AND. Always AND.

[–] lud@lemm.ee 8 points 9 hours ago* (last edited 9 hours ago)

My bad. It's "must have both or none"

[–] ayyy@sh.itjust.works 0 points 7 hours ago (1 children)

Isn’t that the same as AND but with a lot of extra words?

[–] lud@lemm.ee 3 points 7 hours ago* (last edited 7 hours ago)

No, AND won't match 0,0 while XNOR will. An AND switch would be useless for a staircase.

AND also won't match 1,0 or 0,1 while XOR does.