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It's been a while since I was not able to find an answer to a technical question in google. Usually I can find anything, the key is to know part of the answer.
Now my math skills are lagging.
I have a 32 bit unsigned number. I need to check if bit N (11 < N < 22) is set when a number is divided by 3. The trick is I don't want to do a division and would like to know if I can construct a bitmask for each N which checks the bit using only bit ops.
I have a hunch that a method exists, but not sure studying which area of math may help.
Now my math skills are lagging.
I have a 32 bit unsigned number. I need to check if bit N (11 < N < 22) is set when a number is divided by 3. The trick is I don't want to do a division and would like to know if I can construct a bitmask for each N which checks the bit using only bit ops.
I have a hunch that a method exists, but not sure studying which area of math may help.
