# Multiply two numbers without using * operator

By Satyapriya Nayak Dec 14, 2012
In this blog we will know how to multiply two numbers without using * operator.

In this blog 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 == "")

{

}

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)

{

}

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;

}

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 == "")

{

}

else

{

MessageBox.Show(Multiply(Convert.ToDouble(textBox1.Text), Convert.ToDouble(textBox2.Text)).ToString());

}

clear();

}

void clear()

{

textBox1.Text = "";

textBox2.Text = "";

}

}

}

Satyapriya Nayak

Satyapriya Nayak is a software developer from Bhubaneswar, India. He holds a Bachelor's degree in Electronics and telecommunication and is an active member of C# Corner.