Question

How would I write code in Java, where the user inputs a binary number and the system reads the input and outputs if there was an even or odd number of 1s typed. For example, if I typed 10101 it should output as odd. and if I typed 11011 it should output as even.

Answer 1

BinaryEvenOddTest.java

import java.util.Scanner;

public class BinaryEvenOddTest {

   public static void main(String[] args) {
       Scanner console = new Scanner(System.in);
       System.out.println("Enter the binary number");
       int binary = console.nextInt();
       int countOnes = 0;
       while(binary > 0) {
           int r = binary % 10;
           if(r == 1) {
               countOnes++;
           }
           binary = binary/10;
       }
       if(countOnes % 2 == 0) {
           System.out.println("Number of 1's is Even");
       } else {
           System.out.println("Number of 1's is Odd");
       }
   }

}

Output:

Enter the binary number
10101
Number of 1's is Odd