twobinarystring.java

import java.util.Scanner;
public class twobinarystring {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter first binary string:");
        String a = sc.nextLine();
        System.out.println("Enter second binary string:");
        String b = sc.nextLine();
        String result = addBinary(a, b);
        System.out.println("The sum of the binary strings is: " + result);
    }
    public static String addBinary(String a, String b) {
        StringBuilder sb = new StringBuilder();
        int i = a.length() - 1, j = b.length() - 1,carry = 0;
        while (i >= 0 || j >= 0) {
            int sum = carry;
            if (i >= 0) {
                sum += a.charAt(i) - '0';
                i--;
            }
            if (j >= 0) {
                sum += b.charAt(j) - '0';
                j--;
            }
            sb.append(sum % 2);
            carry = sum / 2;
        }
        if (carry != 0) {
            sb.append(carry);
        }
        return sb.reverse().toString();
    }
}