How to check if a number is a power of 2

Question

Today I needed a simple algorithm for checking if a number is a power of 2.

The algorithm needs to be:

1. Simple
2. Correct for any ulong

Answer 1

This program in java returns "true" if number is a power of 2 and returns "false" if its not a power of 2

// To check if the given number is power of 2

import java.util.Scanner;

public class PowerOfTwo {
    int n;
    void solve() {
        while(true) {
//          To eleminate the odd numbers
            if((n%2)!= 0){
                System.out.println("false");
                break;
            }
//  Tracing the number back till 2
            n = n/2;
//  2/2 gives one so condition should be 1
            if(n == 1) {
                System.out.println("true");
                break;
            }
        }
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        PowerOfTwo obj = new PowerOfTwo();
        obj.n = in.nextInt();
        obj.solve();
    }

}

OUTPUT : 
34
false

16
true