Windows Calculator in C#


Introduction

This is a simple Calculator application as you will find in a Windows accessories. The only difference is that it doesn't have scientific mode. But as it is open source any one can modified it as long as you are giving credit to me.



Platform Used

I have used .NET WinForms and Visual Studio .NET to develop this project.

Source Code

namespace Calc
{
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.WinForms;
using System.Data;
/*Class to creat a claculator application it is a sim[le calculator you can use
*the logic to make a scientific calculator source is open for you.*/
public class Calc : System.WinForms.Form
{
/*Enum for holding Operator*/
protected enum Operator
{
NO_OP,
ADD,
SUB,
MUL,
DIV
}
/*Memory Store element*/
private double m_MStore = 0;
/*To hold the the result*/
private double m_Result = 0;
/*To hold the operator*/
private Operator m_OP = Operator.NO_OP;
/*To recognise is it start of calculation*/
private bool m_Start = true;
/*To make dession to append test or not*/
private bool m_Append = false;
/*To make dission can do the backspace*/
private bool m_Backspace = true;
/*To make dission can write*/
private bool m_CanWrite = true;
/*UI Componant.*/
private System.ComponentModel.Container components;
private System.WinForms.MenuItem menuItem5;
private System.WinForms.MenuItem menuItem4;
private System.WinForms.MenuItem menuItem3;
private System.WinForms.Button m_Dot;
private System.WinForms.Button m_BS;
private System.WinForms.Button m_Res;
private System.WinForms.Button m_C;
private System.WinForms.Button m_Div;
private System.WinForms.Button m_Mul;
private System.WinForms.Button m_Sub;
private System.WinForms.Button m_Add;
private System.WinForms.Button m_MS;
private System.WinForms.Button m_Zero;
private System.WinForms.Button m_MR;
private System.WinForms.Button m_Nine;
private System.WinForms.Button m_Eight;
private System.WinForms.Button m_Seven;
private System.WinForms.Button m_Six;
private System.WinForms.Button m_Five;
private System.WinForms.Button m_Four;
private System.WinForms.Button m_Three;
private System.WinForms.Button m_Two;
private System.WinForms.Button m_One;
private System.WinForms.TextBox m_TB;
private System.WinForms.MenuItem menuItem2;
private System.WinForms.MenuItem menuItem1;
private System.WinForms.MainMenu mainMenu1;
/*Want by WinForm class*/
public Calc()
{
InitializeComponent();
}
/*Want by winform class*/
public override void Dispose()
{
base.Dispose();
components.Dispose();
}
/*Inintialise tha all the componant.*/
private void InitializeComponent()
{
System.Resources.ResourceManager resources =
new System.Resources.ResourceManager (typeof(Calc));
this.components = new System.ComponentModel.Container ();
this.m_Mul = new System.WinForms.Button ();
this.m_Five = new System.WinForms.Button ();
this.m_C = new System.WinForms.Button ();
this.menuItem3 = new System.WinForms.MenuItem ();
this.m_One = new System.WinForms.Button ();
this.menuItem1 = new System.WinForms.MenuItem ();
this.menuItem2 = new System.WinForms.MenuItem ();
this.m_Nine = new System.WinForms.Button ();
this.m_Three = new System.WinForms.Button ();
this.m_MR = new System.WinForms.Button ();
this.m_Add = new System.WinForms.Button ();
this.m_Two = new System.WinForms.Button ();
this.m_MS = new System.WinForms.Button ();
this.m_Zero = new System.WinForms.Button ();
this.m_Eight = new System.WinForms.Button ();
this.m_TB = new System.WinForms.TextBox ();
this.m_Dot = new System.WinForms.Button ();
this.m_Six = new System.WinForms.Button ();
this.m_Seven = new System.WinForms.Button ();
this.m_Four = new System.WinForms.Button ();
this.m_Div = new System.WinForms.Button ();
this.menuItem4 = new System.WinForms.MenuItem ();
this.menuItem5 = new System.WinForms.MenuItem ();
this.m_Sub = new System.WinForms.Button ();
this.mainMenu1 = new System.WinForms.MainMenu ();
this.m_BS = new System.WinForms.Button ();
this.m_Res = new System.WinForms.Button ();
m_Mul.Location =
new System.Drawing.Point (184, 192);
m_Mul.ForeColor = System.Drawing.Color.Black;
m_Mul.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Mul.Size =
new System.Drawing.Size (88, 32);
m_Mul.TabIndex = 15;
m_Mul.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Mul.Text = "*";
m_Mul.Click +=
new System.EventHandler (this.m_Mul_Click);
m_Five.Location =
new System.Drawing.Point (64, 144);
m_Five.ForeColor = System.Drawing.Color.Red;
m_Five.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Five.Size =
new System.Drawing.Size (40, 32);
m_Five.TabIndex = 5;
m_Five.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Five.Text = "5";
m_Five.Click +=
new System.EventHandler (this.m_Value_Click);
m_C.Location =
new System.Drawing.Point (64, 48);
m_C.ForeColor = System.Drawing.Color.Black;
m_C.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_C.Size =
new System.Drawing.Size (40, 32);
m_C.TabIndex = 17;
m_C.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_C.Text = "C";
m_C.Click +=
new System.EventHandler (this.m_C_Click);
menuItem3.Text = "Help";
menuItem3.Index = 1;
menuItem3.MenuItems.All =
new System.WinForms.MenuItem[2] {this.menuItem4, this.menuItem5};
m_One.Location =
new System.Drawing.Point (8, 96);
m_One.ForeColor = System.Drawing.Color.Red;
m_One.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_One.Size =
new System.Drawing.Size (40, 32);
m_One.TabIndex = 1;
m_One.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_One.Text = "1";
m_One.Click +=
new System.EventHandler (this.m_Value_Click);
menuItem1.Text = "Menu";
menuItem1.Index = 0;
menuItem1.MenuItems.All =
new System.WinForms.MenuItem[1] {this.menuItem2};
menuItem2.Text = "Exit";
menuItem2.Index = 0;
menuItem2.Click +=
new System.EventHandler (this.menuItem2_Click);
m_Nine.Location =
new System.Drawing.Point (120, 192);
m_Nine.ForeColor = System.Drawing.Color.Red;
m_Nine.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Nine.Size =
new System.Drawing.Size (40, 32);
m_Nine.TabIndex = 9;
m_Nine.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Nine.Text = "9";
m_Nine.Click +=
new System.EventHandler (this.m_Value_Click);
m_Three.Location =
new System.Drawing.Point (120, 96);
m_Three.ForeColor = System.Drawing.Color.Red;
m_Three.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Three.Size =
new System.Drawing.Size (40, 32);
m_Three.TabIndex = 3;
m_Three.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Three.Text = "3";
m_Three.Click +=
new System.EventHandler (this.m_Value_Click);
m_MR.Location =
new System.Drawing.Point (8, 240);
m_MR.ForeColor = System.Drawing.SystemColors.ActiveCaption;
m_MR.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_MR.Size =
new System.Drawing.Size (40, 32);
m_MR.TabIndex = 10;
m_MR.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_MR.Text = "MR";
m_MR.Click +=
new System.EventHandler (this.m_MR_Click);
m_Add.Location =
new System.Drawing.Point (184, 96);
m_Add.ForeColor = System.Drawing.SystemColors.WindowText;
m_Add.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Add.Size =
new System.Drawing.Size (88, 32);
m_Add.TabIndex = 13;
m_Add.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Add.Text = "+";
m_Add.Click +=
new System.EventHandler (this.m_Add_Click);
m_Two.Location =
new System.Drawing.Point (64, 96);
m_Two.ForeColor = System.Drawing.Color.Red;
m_Two.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Two.Size =
new System.Drawing.Size (40, 32);
m_Two.TabIndex = 2;
m_Two.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Two.Text = "2";
m_Two.Click +=
new System.EventHandler (this.m_Value_Click);
m_MS.Location =
new System.Drawing.Point (120, 240);
m_MS.ForeColor = System.Drawing.SystemColors.ActiveCaption;
m_MS.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_MS.Size =
new System.Drawing.Size (40, 32);
m_MS.TabIndex = 12;
m_MS.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_MS.Text = "MS";
m_MS.Click +=
new System.EventHandler (this.m_MS_Click);
m_Zero.Location =
new System.Drawing.Point (64, 240);
m_Zero.ForeColor = System.Drawing.Color.Red;
m_Zero.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Zero.Size =
new System.Drawing.Size (40, 32);
m_Zero.TabIndex = 11;
m_Zero.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Zero.Text = "0";
m_Zero.Click +=
new System.EventHandler (this.m_Value_Click);
m_Eight.Location =
new System.Drawing.Point (64, 192);
m_Eight.ForeColor = System.Drawing.Color.Red;
m_Eight.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Eight.Size =
new System.Drawing.Size (40, 32);
m_Eight.TabIndex = 8;
m_Eight.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Eight.Text = "8";
m_Eight.Click +=
new System.EventHandler (this.m_Value_Click);
m_TB.Location =
new System.Drawing.Point (8, 8);
m_TB.ReadOnly =
true;
m_TB.Text = "0";
m_TB.MaxLength = 12;
m_TB.Font =
new System.Drawing.Font ("Tahoma", 12, System.Drawing.FontStyle.Bold);
m_TB.TabIndex = 0;
m_TB.Size =
new System.Drawing.Size (264, 27);
m_TB.BackColor = System.Drawing.SystemColors.ScrollBar;
m_TB.TextAlign = System.WinForms.HorizontalAlignment.Right;
m_Dot.Location =
new System.Drawing.Point (120, 48);
m_Dot.ForeColor = System.Drawing.Color.Black;
m_Dot.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Dot.Size =
new System.Drawing.Size (40, 32);
m_Dot.TabIndex = 20;
m_Dot.Font =
new System.Drawing.Font ("Tahoma", 16, System.Drawing.FontStyle.Bold);
m_Dot.Text = ".";
m_Dot.Click +=
new System.EventHandler (this.m_Value_Click);
m_Six.Location =
new System.Drawing.Point (120, 144);
m_Six.ForeColor = System.Drawing.Color.Red;
m_Six.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Six.Size =
new System.Drawing.Size (40, 32);
m_Six.TabIndex = 6;
m_Six.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Six.Text = "6";
m_Six.Click +=
new System.EventHandler (this.m_Value_Click);
m_Seven.Location =
new System.Drawing.Point (8, 192);
m_Seven.ForeColor = System.Drawing.Color.Red;
m_Seven.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Seven.Size =
new System.Drawing.Size (40, 32);
m_Seven.TabIndex = 7;
m_Seven.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Seven.Text = "7";
m_Seven.Click +=
new System.EventHandler (this.m_Value_Click);
m_Four.Location =
new System.Drawing.Point (8, 144);
m_Four.ForeColor = System.Drawing.Color.Red;
m_Four.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Four.Size =
new System.Drawing.Size (40, 32);
m_Four.TabIndex = 4;
m_Four.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Four.Text = "4";
m_Four.Click +=
new System.EventHandler (this.m_Value_Click);
m_Div.Location =
new System.Drawing.Point (184, 240);
m_Div.ForeColor = System.Drawing.Color.Black;
m_Div.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Div.Size =
new System.Drawing.Size (88, 32);
m_Div.TabIndex = 16;
m_Div.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Div.Text = "/";
m_Div.Click +=
new System.EventHandler (this.m_Div_Click);
menuItem4.Text = "Help";
menuItem4.Index = 0;
menuItem4.Click +=
new System.EventHandler (this.menuItem4_Click);
menuItem5.Text = "About Calc.";
menuItem5.Index = 1;
menuItem5.Click +=
new System.EventHandler (this.menuItem5_Click);
m_Sub.Location =
new System.Drawing.Point (184, 144);
m_Sub.ForeColor = System.Drawing.SystemColors.WindowText;
m_Sub.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Sub.Size =
new System.Drawing.Size (88, 32);
m_Sub.TabIndex = 14;
m_Sub.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Sub.Text = "-";
m_Sub.Click +=
new System.EventHandler (this.m_Sub_Click);
mainMenu1.MenuItems.All =
new System.WinForms.MenuItem[2] {this.menuItem1, this.menuItem3};
m_BS.Location =
new System.Drawing.Point (8, 48);
m_BS.ForeColor = System.Drawing.Color.Black;
m_BS.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_BS.Size =
new System.Drawing.Size (40, 32);
m_BS.TabIndex = 19;
m_BS.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_BS.Text = "BS";
m_BS.Click +=
new System.EventHandler (this.m_BS_Click);
m_Res.Location =
new System.Drawing.Point (184, 48);
m_Res.ForeColor = System.Drawing.Color.Black;
m_Res.BackColor = (System.Drawing.Color) System.Drawing.Color.FromARGB (192, 192, 0);
m_Res.Size =
new System.Drawing.Size (88, 32);
m_Res.TabIndex = 18;
m_Res.Font =
new System.Drawing.Font ("Tahoma", 10, System.Drawing.FontStyle.Bold);
m_Res.Text = "=";
m_Res.Click +=
new System.EventHandler (this.m_Res_Click);
this.Text = "Abhijeet's Calc";
this.MaximizeBox = false;
this.StartPosition = System.WinForms.FormStartPosition.CenterScreen;
this.AutoScaleBaseSize = new System.Drawing.Size (5, 13);
this.BorderStyle = System.WinForms.FormBorderStyle.Fixed3D;
this.AutoScale = false;
this.ForeColor = System.Drawing.Color.Red;
this.TransparencyKey = (System.Drawing.Color) System.Drawing.Color.FromARGB (255, 128, 0);
this.Icon = (System.Drawing.Icon) resources.GetObject ("$this.Icon");
this.TopMost = true;
this.Menu = this.mainMenu1;
this.BackColor = System.Drawing.SystemColors.Desktop;
this.ClientSize = new System.Drawing.Size (278, 279);
this.Controls.Add (this.m_Dot);
this.Controls.Add (this.m_BS);
this.Controls.Add (this.m_Res);
this.Controls.Add (this.m_C);
this.Controls.Add (this.m_Div);
this.Controls.Add (this.m_Mul);
this.Controls.Add (this.m_Sub);
this.Controls.Add (this.m_Add);
this.Controls.Add (this.m_MS);
this.Controls.Add (this.m_Zero);
this.Controls.Add (this.m_MR);
this.Controls.Add (this.m_Nine);
this.Controls.Add (this.m_Eight);
this.Controls.Add (this.m_Seven);
this.Controls.Add (this.m_Six);
this.Controls.Add (this.m_Five);
this.Controls.Add (this.m_Four);
this.Controls.Add (this.m_Three);
this.Controls.Add (this.m_Two);
this.Controls.Add (this.m_One);
this.Controls.Add (this.m_TB);
}
/*Event Handlers*/
protected void menuItem4_Click (object sender, System.EventArgs e)
{
MessageBox.Show("So Simple application still you want Help? if yes contact me at toabhijeet@yahoo.com");
}
protected void menuItem5_Click (object sender, System.EventArgs e)
{
MessageBox.Show("This Calc Is Developed By Abhijeet :-> toabhijeet@yahoo.com");
}
protected void m_MS_Click (object sender, System.EventArgs e)
{
this.m_MStore = this.m_TB.Text.Trim().ToDouble();
}
protected void m_MR_Click(object sender, System.EventArgs e)
{
if(this.m_CanWrite)
{
this.m_TB.Text = this.m_MStore.ToString();
}
}
protected void m_BS_Click (object sender, System.EventArgs e)
{
if(this.m_Backspace)
{
String sSub =
this.m_TB.Text.Trim();
if(sSub.Length > 1)
{
this.m_TB.Text = sSub.Substring(0, sSub.Length - 1);
}
else
{
this.m_TB.Text = "0";
this.m_Append = false;
}
}
}
protected void m_C_Click (object sender, System.EventArgs e)
{
this.m_TB.Text = "0";
this.m_Result = 0;
this.m_Start = true;
this.m_Append = false;
this.m_CanWrite = true;
this.m_Backspace = true;
this.m_OP = Operator.NO_OP;
}
protected void m_Sub_Click (object sender, System.EventArgs e)
{
this.m_Append = false;
if(!this.m_Start)
{
CalculateResult();
if(this.m_OP != Operator.SUB)
{
this.m_OP = Operator.SUB;
}
}
else
{
this.m_OP = Operator.SUB;
this.m_Result = this.m_TB.Text.ToDouble();
this.m_Start = false;
}
this.m_CanWrite = true;
}
protected void m_Mul_Click (object sender, System.EventArgs e)
{
this.m_Append = false;
if(!this.m_Start)
{
CalculateResult();
if(this.m_OP != Operator.MUL)
{
this.m_OP = Operator.MUL;
}
}
else
{
this.m_OP = Operator.MUL;
this.m_Result = this.m_TB.Text.ToDouble();
this.m_Start = false;
}
this.m_CanWrite = true;
}
protected void m_Div_Click (object sender, System.EventArgs e)
{
this.m_Append = false;
if(!this.m_Start)
{
CalculateResult();
if(this.m_OP != Operator.DIV)
{
this.m_OP = Operator.DIV;
}
}
else
{
this.m_OP = Operator.DIV;
this.m_Result = this.m_TB.Text.ToDouble();
this.m_Start = false;
}
this.m_CanWrite = true;
}
protected void m_Res_Click (object sender, System.EventArgs e)
{
this.CalculateResult();
this.m_Start = true;
}
protected void m_Add_Click (object sender, System.EventArgs e)
{
this.m_Append = false;
if(!this.m_Start)
{
CalculateResult();
if(this.m_OP != Operator.ADD)
{
this.m_OP = Operator.ADD;
}
}
else
{
this.m_OP = Operator.ADD;
this.m_Result = this.m_TB.Text.Trim().ToDouble();
this.m_Start = false;
}
this.m_CanWrite = true;
}
protected void m_Value_Click (object sender, System.EventArgs e)
{
if(this.m_CanWrite)
{
/*Formate ToString returns is like "Button, text: <value>" so
*retriving value from it.*/
int iIndex = sender.ToString().IndexOf(":");
String sSub = sender.ToString().Substring(iIndex + 1).Trim();
if( !(sSub.Equals("0") && sSub.Equals(this.m_TB.Text.Trim())) )
{
ShowText(sSub);
}
else
{
this.m_Append = false;
}
this.m_Backspace = true;
}
}
protected void menuItem2_Click (object sender, System.EventArgs e)
{
Application.Exit();
}
/*Calculate the result*/
private void CalculateResult()
{
switch(this.m_OP)
{
case Operator.ADD:
this.m_Result += this.m_TB.Text.Trim().ToDouble();
break;
case Operator.SUB:
this.m_Result -= this.m_TB.Text.Trim().ToDouble();
break;
case Operator.MUL:
this.m_Result *= this.m_TB.Text.Trim().ToDouble();
break;
case Operator.DIV:
this.m_Result /= this.m_TB.Text.Trim().ToDouble();
break;
default:
break;
}
ShowResult();

/*Shows the result.*/
private void ShowResult()
{
this.m_Backspace = false;
this.m_TB.Text = this.m_Result.ToString();
this.m_CanWrite = false;
}
/*Shows the values entered by user*/
private void ShowText(String sSub)
{
if(this.m_CanWrite)
{
if(this.m_Append)
{
this.m_TB.AppendText(sSub.Trim());
}
else
{
this.m_TB.Text = sSub;
this.m_Append = true;
}
}
}
/*Starting point of Calulator Program.*/
public static void Main(string[] args)
{
Application.Run(
new Calc());
}
}
}