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Multiply two numbers without using * operator

Posted By:satyapriyanayak       Posted Date: January 16, 2014    Points: 40    Category: Visual Studio    URL: http://www.dotnetspark.com  

In this Code Snippets we will know how to multiply two numbers without using * operator.
 

Method-1

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 Multiply_two_numbers_without_star
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void btn_Multiply_Click(object sender, EventArgs e)
        {
            
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                MessageBox.Show("Please insert the numbers");
            }
            else
            {
                MessageBox.Show(multiply(Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text)).ToString());
            }
            clear();
        }

        void clear()
        {
            textBox1.Text = "";
            textBox2.Text = "";
        }

        private int multiply(int a, int b)
        {

            int result = 0, i = 0;

            while (i != b)
            {
                result = addition(result, a);
                i = addition(i, 1);
            }

            return result;
        }

        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;

        }

    }
}

Method-2

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 Multiply_two_numbers_without_star
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Double Multiply(Double A, Double B)
        {
            Double iResult;
            iResult = 0;
            if (A == 0 || B == 0)
            {
                iResult = 0;
            }
            else
            {
                for (int i = 1; i <= B; i++)
                {
                    iResult = iResult + A;
                }
            }
            return iResult;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                MessageBox.Show("Please insert the numbers");
            }
            else
            {
                MessageBox.Show(Multiply(Convert.ToDouble(textBox1.Text), Convert.ToDouble(textBox2.Text)).ToString());
            }
            clear();
        }
        void clear()
        {
            textBox1.Text = "";
            textBox2.Text = "";
        }
    }
}



     

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