Add Two Numbers without using + Operator

By Satyapriya Nayak Blogs | Windows Forms C# Dec 18, 2012
In this blog, we will know how to add two numbers without using + operator.
Download Files: Addition two numbers

In this blog, we will know how to add two numbers without using + operator.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Addition_two_numbers_without_plus
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void btn_Addition_Click(object sender, EventArgs e)
        {
            int value1, value2;
            if (!int.TryParse(textBox1.Text, out value1))
            {
                MessageBox.Show("Not a valid integer. Please re-enter.");
                textBox1.Focus();
                return;
            }
            if (!int.TryParse(textBox2.Text, out value2))
            {
                MessageBox.Show("Not a valid integer. Please re-enter.");
                textBox2.Focus();
                return;
            }
            MessageBox.Show("Addition:" + addition(Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text)).ToString());
            clear();
        }
        void clear()
        {
            textBox1.Text = "";
            textBox2.Text = "";
        }
        private int addition(int a, int b)
        {

            int result = 0, carry;
            carry = a & b;

            if (Convert.ToBoolean(carry))
            {
                result = a ^ b;
                carry = carry << 1;
                result = addition(carry, result);
            }
            else
            {
                result = a ^ b;
            }
            return result;
        }
    }
}

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