If I XOR the upper Nybble of a tasty Byte, will I have more friends?
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Only of a certain 'type'Originally posted by DimPrawn View Post -
If you do it twice you'll be where you started.
See the (bit)pattern?Comment
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Except in the case where you XOR it with itself... the first time will zero it, and the second will just leave it set to zero.Originally posted by Churchill View Post
This is why the "swap two values without an intermediate location" trick only works if you can guarantee that the two locations holding the values are different.
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Take the 'mask' off.Originally posted by NickFitz View PostExcept in the case where you XOR it with itself... the first time will zero it, and the second will just leave it set to zero.
This is why the "swap two values without an intermediate location" trick only works if you can guarantee that the two locations holding the values are different.
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You can't - if the source, mask and destination are all the same location (i.e. the value at that location is XORed with itself and the result stored back into that location in one atomic operation), then the mask has become zero.Originally posted by Churchill View PostComment
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Nybble - that was a cool mag. dedicated to Apple II. i can remember entering hex code by hand from the pages. What was hilarious is watching terminator and seeing the code scroll by.McCoy: "Medical men are trained in logic."
Spock: "Trained? Judging from you, I would have guessed it was trial and error."Comment
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I have absolutely no idea what any of you are talking about
ǝןqqıʍComment
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Never mind JuniorOriginally posted by DiscoStu View PostI have absolutely no idea what any of you are talking about
Before your time son
Confusion is a natural state of beingComment
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That's why it's called an exclusive orOriginally posted by DiscoStu View PostI have absolutely no idea what any of you are talking about
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