LeetCode - 231. Power of Two

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

Example 1:

Input: 1
Output: true 
Explanation: 20 = 1

Example 2:

Input: 16
Output: true
Explanation: 24 = 16

Example 3:

Input: 218
Output: false

public boolean isPowerOfTwo(int n) {//位运算 my
        if(n!=0 && n!= -2147483648 && (n&(n-1))==0){
            return true;
        }
        return false;
    }

 

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