Adding two numbers without using arithmetic operators

As you know to find sum of to two numbers we usually use arithmetic operator(+) but in this post we will write a java program to Adding two numbers without using arithmetic operators.

package com.kkjavatutorials.client;
import java.util.Scanner;
/**
 * @author KK JavaTutorials
 *Java program to add two numbers without using arithmetic operators
 */
public class SumOfTwoNumbersTest {

	public static void main(String[] args) {
		Scanner scanner = null;
		int number1;
		int number2;
		
		try {
			scanner = new Scanner(System.in);
			System.out.print("Enter first number:");
			number1 = scanner.nextInt();
			System.out.print("Enter second number:");
			number2 = scanner.nextInt();
			int sumOfTwoNumbers = addTwoNumbers(number1,number2);
			System.out.println("Sum of two numbers = "+sumOfTwoNumbers);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private static int addTwoNumbers(int number1, int number2) 
    { 
        // Iterate till there is no carry remain
        while (number2 != 0)  
        { 
            //Here carry will contain common 
        	//set of bits of number1 and number2 
            int carry = number1 & number2; 
  
            // Now sum of bits of number1 and number2 where at 
            //least one of the bits is not set 
            number1 = number1 ^ number2; 
  
            //Carry is shifted by one bit so that adding
            //it to number1 gives the required sum 
            number2 = carry << 1; 
        } 
        return number1; 
    } 
}

package com.kkjavatutorials.client;

import java.util.Scanner;

/**

* @author KK JavaTutorials

*Java program to add two numbers without using arithmetic operators

public class SumOfTwoNumbersTest {

public static void main(String[] args) {

Scanner scanner = null;

int number1;

int number2;

try {

scanner = new Scanner(System.in);

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

number1 = scanner.nextInt();

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

number2 = scanner.nextInt();

int sumOfTwoNumbers = addTwoNumbers(number1,number2);

System.out.println("Sum of two numbers = "+sumOfTwoNumbers);

} catch (Exception e) {

e.printStackTrace();

}

private static int addTwoNumbers(int number1, int number2)

{

// Iterate till there is no carry remain

while (number2 != 0)

{

//Here carry will contain common

//set of bits of number1 and number2

int carry = number1 & number2;

// Now sum of bits of number1 and number2 where at

//least one of the bits is not set

number1 = number1 ^ number2;

//Carry is shifted by one bit so that adding

//it to number1 gives the required sum

number2 = carry << 1;

}

return number1;

}

Sample output of above program:

Enter first number:10
Enter second number:15
Sum of two numbers = 25

Enter first number:10

Enter second number:15

Sum of two numbers = 25

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