[leetcode]-326. Power of Three（C语言）

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

Follow up:
Could you do it without using any loop / recursion?

bool isPowerOfThree(int n) {
    if(n<=0)
        return false;
    double s=log10(n)/log10(3);
    if(s-(int)s==0)
        return true;
    return false;
}