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 == "")
{
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 = "";
}
}
}