LeetCode之旅（19）-Power of Two

题目

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

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

思路

判断一个整数，是不是的2的次方数 ，利用对2求余，来循环除以2，看最后是不是1

代码：

public class Solution {
    public boolean isPowerOfTwo(int n) {
        if(n <= 0){
            return false;
        }else{
            while(n % 2 == 0){
                n = n/2;
            }
            return n == 1;
        }
    }
}