Building a Calculator using C#

Code:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace work1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private double num1;

private double num2;

private string cal;

private bool inputstatus = true;

private void button1_Click(object sender, EventArgs e)

{

if (inputstatus)

{

if (textBox1.Text.Length >= 1)

{

textBox1.Text += button1.Text;

}

private void button2_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button2.Text;

}

else

{

textBox1.Text = button2.Text;

inputstatus = true;

}

private void button3_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button3.Text;

}

else

{

textBox1.Text = button3.Text;

inputstatus = true;

}

private void button4_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button4.Text;

}

else

{

textBox1.Text = button4.Text;

inputstatus = true;

}

private void button5_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button5.Text;

}

else

{

textBox1.Text = button5.Text;

inputstatus = true;

}

private void button6_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button6.Text;

}

else

{

textBox1.Text = button6.Text;

inputstatus = true;

}

private void button7_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button7.Text;

}

else

{

textBox1.Text = button7.Text;

inputstatus = true;

}

private void button8_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button8.Text;

}

else

{

textBox1.Text = button8.Text;

inputstatus = true;

}

private void button9_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button9.Text;

}

else

{

textBox1.Text = button9.Text;

inputstatus = true;

}

private void button10_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button10.Text;

}

else

{

textBox1.Text = button10.Text;

inputstatus = true;

}

private void button11_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "+";

}

private void button12_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "-";

}

private void button13_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "*";

}

private void button14_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "/";

}

private void button16_Click(object sender, EventArgs e)

{

result();

cal = string.Empty;

}

private void button15_Click(object sender, EventArgs e)

{

textBox1.Text = string.Empty;

num2 = 0;

cal = string.Empty;

}

private void result()

{

num2 = System.Double.Parse(textBox1.Text);

switch (cal)

{

case "+":

num1 = num1 + num2;

break;

case "-":

num1 = num1 - num2;

break;

case "*":

num1 = num1 * num2;

break;

case "/":

num1 = num1 / num2;

break;

}

textBox1.Text = num1.ToString();

inputstatus = false;

}

private void copyToolStripMenuItem_Click(object sender, EventArgs e)

{

textBox1.Copy();

}

private void pasteCtrlVToolStripMenuItem_Click(object sender, EventArgs e)

{

textBox1.Paste();

}

private void cutCtrlXToolStripMenuItem_Click(object sender, EventArgs e)

{

textBox1.Cut();

}

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Dipankar Biswas12y ago

Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace work1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private double num1;

private double num2;

private string cal;

private bool inputstatus = true;

private void button1_Click(object sender, EventArgs e)

{

if (inputstatus)

{

if (textBox1.Text.Length >= 1)

{

textBox1.Text += button1.Text;

}

}

}

private void button2_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button2.Text;

}

else

{

textBox1.Text = button2.Text;

inputstatus = true;

}

}

private void button3_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button3.Text;

}

else

{

textBox1.Text = button3.Text;

inputstatus = true;

}

}

private void button4_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button4.Text;

}

else

{

textBox1.Text = button4.Text;

inputstatus = true;

}

}

private void button5_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button5.Text;

}

else

{

textBox1.Text = button5.Text;

inputstatus = true;

}

}

private void button6_Click(object sender, EventArgs e)

{
if (inputstatus)

{

textBox1.Text += button6.Text;

}

else

{

textBox1.Text = button6.Text;

inputstatus = true;

}

}

private void button7_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button7.Text;

}

else

{

textBox1.Text = button7.Text;

inputstatus = true;

}

}

private void button8_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button8.Text;

}

else

{

textBox1.Text = button8.Text;

inputstatus = true;

}

}

private void button9_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button9.Text;

}

else

{

textBox1.Text = button9.Text;

inputstatus = true;

}

}

private void button10_Click(object sender, EventArgs e)

{

if (inputstatus)

{

textBox1.Text += button10.Text;

}

else

{

textBox1.Text = button10.Text;

inputstatus = true;

}

}

private void button11_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "+";

}

}

private void button12_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "-";

}
}

private void button13_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{
num1 = System.Double.Parse(textBox1.Text);

result();

cal = "*";

}

}

private void button14_Click(object sender, EventArgs e)

{

if (textBox1.Text.Length != 0)

{

num1 = System.Double.Parse(textBox1.Text);

result();

cal = "/";
}

}

private void button16_Click(object sender, EventArgs e)

{

result();

cal = string.Empty;

}

private void button15_Click(object sender, EventArgs e)

{

textBox1.Text = string.Empty;

num2 = 0;

cal = string.Empty;

}

private void result()

{

num2 = System.Double.Parse(textBox1.Text);

switch (cal)

{

case "+":

num1 = num1 + num2;

break;

case "-":

num1 = num1 - num2;

break;

case "*":

num1 = num1 * num2;

break;

case "/":
num1 = num1 / num2;

break;

}

textBox1.Text = num1.ToString();

inputstatus = false;

}

private void copyToolStripMenuItem_Click(object sender, EventArgs e)

{

textBox1.Copy();

}

private void pasteCtrlVToolStripMenuItem_Click(object sender, EventArgs e)

{

textBox1.Paste();

}

private void cutCtrlXToolStripMenuItem_Click(object sender, EventArgs e)

{

textBox1.Cut();

}

}

}
Sagar Pardeshi12y ago
Hi aane,

follow below url it's help u......

http://code.msdn.microsoft.com/windowsdesktop/Simple-Calculator-d1d8cf4c
Abhishek Yadav12y ago
Hello Anne Leong,

Please find the below link to get solution of your question.

http://www.codeproject.com/Articles/88435/Simple-Guide-to-Mathematical-Expression-Parsing

Hope this will help you..
Mahesh Chand12y ago
Search this website. There are many code samples.