Title Description ：

Given an integer, write a function to determine if it is a power of two.

Their thinking ：

The judgment method is mainly based on 2 Of N The characteristics of power ： Only the first is 1, The rest of you are for 0.

The code is as follows ：

```public class Solution {
public boolean isPowerOfTwo(int n) {
return (n > 0) && ( n & (n - 1)) == 0;
}
}
```

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