Java Program To Add Two Binary Number

In this program we are using Scanner to get the input from user  and then we are adding them bit by bit.

  import java.util.Scanner;
 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");  
 }
}
      

Output:

Enter first binary number: 111
Enter second binary number: 11101
Output: 100100