title: Java Program to Add two Binary Numbers

shortTitle: Add two Binary Numbers

description: In this tutorial we will write a java program to add two binary numbers.

Binary number system has only two symbols **0** & **1** so a **binary numbers** consists of only 0’s and 1’s. Before we write a program for addition, lets see how we do the addition on paper, this is shown in the diagram below:


import java.util.Scanner;

public class JavaExample {

public static void main(String[] args)

{

//Two variables to hold two input binary numbers

long b1, b2;

int i = 0, carry = 0;

//This is to hold the output binary number

int[] sum = new int[10];

//To read the input binary numbers entered by user

Scanner scanner = new Scanner(System.in);

//getting first binary number from user

System.out.print("Enter first binary number: ");

b1 = scanner.nextLong();

//getting second binary number from user

System.out.print("Enter second binary number: ");

b2 = scanner.nextLong();

//closing scanner after use to avoid memory leak

scanner.close();

while (b1 != 0 || b2 != 0)

{

sum[i++] = (int)((b1 % 10 + b2 % 10 + carry) % 2);

carry = (int)((b1 % 10 + b2 % 10 + carry) / 2);

b1 = b1 / 10;

b2 = b2 / 10;

}

if (carry != 0) {

sum[i++] = carry;

}

--i;

System.out.print("Output: ");

while (i >= 0) {

System.out.print(sum[i--]);

}

System.out.print("\n");

}

}