Add two numbers using bitwise operators in swift

Swift program for Add two numbers using bitwise operators. Here more information.

import Foundation
// Swift 4 program for
// Add two numbers using of bitwise operators
class NumberAddition
{
	// Add two numbers
	func addition(_ x: Int, _ y: Int)
	{
      	var a = x;
      	var b = y;
		// Display given numbers
		print("\n [("
			+ String(a) + ") + ("
			+ String(b) + ")] ", terminator: "");
		// 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(" : "
			+ String(a), terminator: "");
	}
	static func main()
	{
		let task: NumberAddition? = NumberAddition();
		// Test Case
		task!.addition(8, -2);
		task!.addition(5, 3);
		task!.addition(-3, -5);
	}
}
NumberAddition.main();

Output

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