Peh Zhengyan the Great Wizard's Programming Challenge (0)

import java.util.*;

public class BinaryAddition
{
    public static void main(String[] args)
    {
        Scanner i=new Scanner(System.in);
        System.out.print("Enter first number: ");
        int n1=Integer.parseInt(i.nextLine());
        System.out.print("Enter second number: ");
        int n2=Integer.parseInt(i.nextLine());
        String sum=magic(n1, n2);
        System.out.println("Sum in binary = "+sum);
    }

    public static String magic(int n1, int n2)
    {
        int sum=n1+n2, i=1, temp=sum;
        String str="";
        do
        {
            i*=2;
        } while(sum>i);
        while(i>1)
        {
            i/=2;
            if(temp-i>=0)
            {
                temp-=i;
                str+="1";
            }
            else
                str+="0";
        }
        return(str);
    }
}