Determine whether a number is a power of 2

Analysis:

The Binary Expression of power 2 is a regular number, for example, 2 = 10, 4 = 100, 8 = 1000, and so on. That is to say, its binary expression only has the highest bit of 1, the rest is 0, so think about it. If we subtract this number by one, the binary value will become another regular number, for example: 2-1 = 00111-1 = 011,8-1 =. Check whether the result of the subtraction is equal to 0. Now, the result is displayed.

If (n> 0 & (N & (n-1) = 0)
N is the power of 2.