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231. power of two

admin 11月 15, 2020 0

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

Example 1:

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Input: 1
Output: true 
Explanation: 20 = 1

Example 2:

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Input: 16
Output: true
Explanation: 24 = 16

Example 3:

1 2	Input: 218 Output: false

class  {
    public boolean isPowerOfTwo(int n) {
        if (n <= 0) return false;
        return (n&(n - 1)) == 0;
    }
}

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