Adding binary numbers

Question

Does anyone know how to add 2 binary numbers, entered as binary, in Java?

For example, 1010 + 10 = 1100.

Answer 1

package Assignment19thDec;

import java.util.Scanner;

public class addTwoBinaryNumbers {

    private static Scanner sc;

    public static void main(String[] args) {

        sc = new Scanner(System.in);
        System.out.println("Enter 1st Binary Number");
        int number1=sc.nextInt();
        int reminder1=0;
        int number2=sc.nextInt();
        int reminder2=0;
        int carry=0;
        double sumResult=0 ;int add = 0
        ;
        int n;
        int power=0;
        while (number1>0 || number2>0) {

            /*System.out.println(number1 + " " +number2);*/

            reminder1=number1%10;
            number1=number1/10;
            reminder2=number2%10;
            number2=number2/10;
            /*System.out.println(reminder1 +"  "+ reminder2);*/


            if(reminder1>1 || reminder2>1 ) {
                System.out.println("not a binary number");
                System.exit(0);
            }

            n=reminder1+reminder2+carry;
            switch(n) {

            case 0: 
                    add=0; carry=0;                                 
                    break;                  
            case 1: add=1; carry=0;
                    break;
            case 2: add=0; carry=1;
                    break;
            case 3: add=1;carry=1;
                    break;
            default: System.out.println("not a binary number ");

            }

            sumResult=add*(Math.pow(10, power))+sumResult;
            power++;


        }

        sumResult=carry*(Math.pow(10, power))+sumResult;
        System.out.println("\n"+(int)sumResult);


    }

}

Answer 2

Use Integer.parseInt(String, int radix).

 public static String addBinary(){
 // The two input Strings, containing the binary representation of the two values:
    String input0 = "1010";
    String input1 = "10";

    // Use as radix 2 because it's binary    
    int number0 = Integer.parseInt(input0, 2);
    int number1 = Integer.parseInt(input1, 2);

    int sum = number0 + number1;
    return Integer.toBinaryString(sum); //returns the answer as a binary value;
}

Answer 3

import java.util.Scanner;

{
    public static void main(String[] args) 
    {
        String b1,b2;
        Scanner sc= new Scanner(System.in);
        System.out.println("Enter 1st binary no. : ") ;
        b1=sc.next();
        System.out.println("Enter 2nd binary no. : ") ;
        b2=sc.next();
        int num1=Integer.parseInt(b1,2);
        int num2=Integer.parseInt(b2,2);
        int sum=num1+num2;
        System.out.println("Additon is : "+Integer.toBinaryString(sum));
    }

}