[LeetCode 解题报告]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

class Solution {
public:
    bool isPowerOfTwo(int n) {
        int count = 0;
        while (n > 0) {
            if (n & 1)
                count ++;
            n = n >> 1;
        }
        
        if (count == 1)
            return true;
        else
            return false;
    }
};