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Trick OR Treat (mander.xyz)
submitted 2 days ago by fossilesque@mander.xyz to c/science_memes@mander.xyz
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[-] humanspiral@lemmy.ca 3 points 2 days ago

What is xnor and when did that become a thing?

[-] lud@lemm.ee 12 points 2 days ago* (last edited 2 days ago)

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 2 points 2 days ago

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

so AND. Always AND.

[-] lud@lemm.ee 10 points 2 days ago* (last edited 2 days ago)

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

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this post was submitted on 30 Oct 2024
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