On the Bit Twiddling Hacks page there is as great as old and esoteric collection of operations at the bit level to carry out all kinds of functions with numerical values conveniently.
The tricks consist of moving bits, using operations such as AND, NOT, OR and XOR, arithmetic calculations and even making type changes (signed, unsigned integers or floating point numbers) depending on what is needed. The notation used is that of the C language.
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