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You're replying to a comment by Peter Kankowski.
> Bit Hack #6. Turn off the rightmost 1-bit
This can be used to test if the number is a power of 2 (or zero):
if((x & (x-1)) == 0) // x is a power of 2
You should read bithacks page and Hacker's Delight book by Henry Warren, Jr. Both contain a lot of more complex bit tricks.
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