java中求解一个数是不是2的n次方

import java.util.Scanner;

import static java.lang.Math.log;

public class code18 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        double exp = log(n) / log(2);
        int exp1 = (int) exp;
        System.out.println(exp);
        System.out.println(exp1);
        if(exp==exp1){
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }

    }
}