231. Power of Two.md

#231. Power of Two

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

the same as [326. Power of Three](./Solution/326. Power of Three.md)

Java Solution

public class Solution {
    public boolean isPowerOfTwo(int n) {
        return (n>0 && 1073741824%n==0);
    }
}

对数解决 为什么用log10

Java Solution

public class Solution {
    public boolean isPowerOfTwo(int n) {
        if(n<0)return false;
        double rest = Math.log10(n)/Math.log10(2);
        if(rest%1==0) return true;
        return false;
    }
}