Different results of using log() and log10()

  • 0

    When asked to solve it in O(1) time and using O(1) space, I came up with formula solution.

    This is my first version and it failed in input n = 536870912.

    public class Solution {
        public boolean isPowerOfTwo(int n) {
            double k = Math.log(n)/Math.log(2);
            return k - Math.floor(k) == 0;

    However, it gets accpeted after I replace Math.log() to Math.log10()

    Anyone knows why?

  • 0

    Well what exactly is k when you use log and what exactly is it when you use log10?

    With different intermediate results that get rounded differently, it's not surprising that you can get different results.

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