How to compute log?

Question

How to compute logarithmic function without using library ?

This is my attempt
https://code.sololearn.com/WF2v2oX0HPa9/?ref=app

But it's not 100% accurate.

What are the other ways?

Answer 1

I think you should try this one,

class Gfg1
{

static int Log2n(int n)
{
return (n > 1) ? 1 + Log2n(n / 2) : 0;
}

// Driver Code
public static void main(String args[])
{
int n = 32;
System.out.println(Log2n(n));
}
}

Answer 2

Yash Sehgal
For what base of log it works? And how can I change that?