Add two numbers using bitwise operators in scala

Scala program for Add two numbers using bitwise operators. Here problem description and explanation.

// Scala program for
// Add two numbers using of bitwise operators
class NumberAddition()
{
	// Add two numbers
	def addition(x: Int, y: Int): Unit = {
      	var a = x;
      	var b = y;
		// Display given numbers
		print("\n [(" + a + ") + (" + b + ")] ");
		// Auxiliary variable which are store the carry bit result
		var carry: Int = 0;
		// Executing loop, until b value is not zero
		while (b != 0)
		{
			// Get carry bits of a & b
			carry = a & b;
			// Sum of bits of a ^ b
			a = a ^ b;
			// Shift the carry bit by one bit in left side
			b = carry << 1;
		}
		// Display add result
		print(" : " + a);
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: NumberAddition = new NumberAddition();
		// Test Case
		task.addition(8, -2);
		task.addition(5, 3);
		task.addition(-3, -5);
	}
}

Output

 [(8) + (-2)]  : 6
 [(5) + (3)]  : 8
 [(-3) + (-5)]  : -8