Prob7_CountOfBitsOne

import java.util.Scanner;

public class Prob7_CountOfBitsOne {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Num = ");
        int num = input.nextInt();
        byte counter = 0;
        for (int i = 0; i < 16; i++) {
            byte bit =(byte)((num >> i) & 1);
            if (bit == 1) {
                counter++;
            }
        }
        //or we don't use a loop and we find the total count of 1s in num by doing this:
        //byte counter = (byte)Integer.bitCount(num);
        System.out.println("There are total " + counter + " ones in Num's binary form.");
    }
}