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2的幂 #18

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Aras-ax opened this issue Mar 14, 2019 · 0 comments

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Aras-ax commented Mar 14, 2019 •

edited

给定一个整数，编写一个函数来判断它是否是 2 的幂次方。

示例 1:

输入: 1
输出: true
解释: 2^0 = 1

示例 2:

输入: 16
输出: true
解释: 2^4 = 16

示例 3:

输入: 218
输出: false

解答

function  isPowerOfTwo(num) {
    return num > 0 &&  (n & (n - 1)) == 0;
}

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