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9.5-bit operation (iv)--explanation code (n& (n-1)) the specific meaning of ==0

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Title: Explanation Code (n& (n-1)) ==0 specific meaning
1) (a&b) Meaning of ==0
The binary representation of A and B in the same location will never be 1.
2) N and n-1 if the least significant bit of n is 1, minus 1 is 0, the remainder is the same and does not meet the requirements. The least significant bit of n is 0, minus 1 o'clock, which must be lent 1 to the high.
3) (n& (n-1)) ==0 meaning the most significant bit of n is 1, and the remaining bits are 0. Therefore, the value of n is one of the 2 of the square. So,(n& (n-1)) ==0 check if n is a 2 (or check if n is 0

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9.5-bit operation (iv)--explanation code (n& (n-1)) the specific meaning of ==0

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