Introduction What is Bitwise Operations?
Please refer to bit operation related (1) - bit operation study notes
First, the operation of the last bit
(1) Remove the last digit—— x>>1
(2) Increase the last digit - increase 0: x<<1 , increase 1: (x<<1)+1
(3) Change the last digit - change to 0: (x|1)-1 , change to 1: x|1 , negate: x^1
2. Operation on the kth bit of the right number
(1) Change to 0: x&~(1<<(k-1))
(2) Change to 1: x|(1<<(k-1))
(3) Negative: x^(1<<(k-1))
(4) Take the kth digit from the right: (x>>(k-1))&1
Third, the operation of the last k bits
(1) Change to 1: x|((1<<k)-1)
(2) Negative: x^((1<<k)-1)
(3) Take the last k bits: x&((1<<k)-1)
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