power_of_two.java

import java.util.Scanner;

public class PowerOfTwo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = sc.nextInt();
        if ((num & (num - 1)) == 0 && num > 0) {
            System.out.println(num + " is a power of two.");
        } else {
            System.out.println(num + " is not a power of two.");
        }
    }
}