In this post we will see How to create a Simple Calculator in C# with windows form application using Visual Studio.
Download Calculator Code C# (Calculator.zip)
Form1.cs
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 Calculator
{
public partial class Form1 : Form
{
Double resultValue = 0;
String operationPerformed = "";
bool isOperationPerformed = false;
public Form1()
{
InitializeComponent();
}
private void button_click(object sender, EventArgs e)
{
if ((textBox_Result.Text == "0") || (isOperationPerformed))
textBox_Result.Clear();
isOperationPerformed = false;
Button button = (Button)sender;
if (button.Text == ".")
{
if(!textBox_Result.Text.Contains("."))
textBox_Result.Text = textBox_Result.Text + button.Text;
}else
textBox_Result.Text = textBox_Result.Text + button.Text;
}
private void operator_click(object sender, EventArgs e)
{
Button button = (Button)sender;
if (resultValue != 0)
{
button15.PerformClick();
operationPerformed = button.Text;
labelCurrentOperation.Text = resultValue + " " + operationPerformed;
isOperationPerformed = true;
}
else
{
operationPerformed = button.Text;
resultValue = Double.Parse(textBox_Result.Text);
labelCurrentOperation.Text = resultValue + " " + operationPerformed;
isOperationPerformed = true;
}
}
private void button4_Click(object sender, EventArgs e)
{
textBox_Result.Text = "0";
}
private void button5_Click(object sender, EventArgs e)
{
textBox_Result.Text = "0";
resultValue = 0;
}
private void button15_Click(object sender, EventArgs e)
{
switch (operationPerformed)
{
case "+":
textBox_Result.Text = (resultValue + Double.Parse(textBox_Result.Text)).ToString();
break;
case "-":
textBox_Result.Text = (resultValue - Double.Parse(textBox_Result.Text)).ToString();
break;
case "*":
textBox_Result.Text = (resultValue * Double.Parse(textBox_Result.Text)).ToString();
break;
case "/":
textBox_Result.Text = (resultValue / Double.Parse(textBox_Result.Text)).ToString();
break;
default:
break;
}
resultValue = Double.Parse(textBox_Result.Text);
labelCurrentOperation.Text = "";
}
}
}
//How to Create a Calculator in Visual Studio C#
//
Form1.Designer.cs
namespace Calculator
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
this.buttonOne = new System.Windows.Forms.Button();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.button5 = new System.Windows.Forms.Button();
this.button6 = new System.Windows.Forms.Button();
this.button7 = new System.Windows.Forms.Button();
this.button8 = new System.Windows.Forms.Button();
this.button9 = new System.Windows.Forms.Button();
this.button11 = new System.Windows.Forms.Button();
this.button12 = new System.Windows.Forms.Button();
this.button13 = new System.Windows.Forms.Button();
this.button14 = new System.Windows.Forms.Button();
this.button15 = new System.Windows.Forms.Button();
this.button16 = new System.Windows.Forms.Button();
this.button17 = new System.Windows.Forms.Button();
this.button19 = new System.Windows.Forms.Button();
this.textBox_Result = new System.Windows.Forms.TextBox();
this.labelCurrentOperation = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// buttonOne
//
this.buttonOne.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.buttonOne.Location = new System.Drawing.Point(22, 73);
this.buttonOne.Name = "buttonOne";
this.buttonOne.Size = new System.Drawing.Size(45, 45);
this.buttonOne.TabIndex = 0;
this.buttonOne.Text = "7";
this.buttonOne.UseVisualStyleBackColor = true;
this.buttonOne.Click += new System.EventHandler(this.button_click);
//
// button1
//
this.button1.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button1.Location = new System.Drawing.Point(73, 73);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(45, 45);
this.button1.TabIndex = 1;
this.button1.Text = "8";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button_click);
//
// button2
//
this.button2.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button2.Location = new System.Drawing.Point(124, 73);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(45, 45);
this.button2.TabIndex = 2;
this.button2.Text = "9";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button_click);
//
// button3
//
this.button3.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button3.Location = new System.Drawing.Point(175, 73);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(45, 45);
this.button3.TabIndex = 3;
this.button3.Text = "/";
this.button3.UseVisualStyleBackColor = true;
this.button3.Click += new System.EventHandler(this.operator_click);
//
// button4
//
this.button4.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button4.Location = new System.Drawing.Point(226, 73);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(53, 45);
this.button4.TabIndex = 4;
this.button4.Text = "CE";
this.button4.UseVisualStyleBackColor = true;
this.button4.Click += new System.EventHandler(this.button4_Click);
//
// button5
//
this.button5.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button5.Location = new System.Drawing.Point(226, 124);
this.button5.Name = "button5";
this.button5.Size = new System.Drawing.Size(53, 45);
this.button5.TabIndex = 9;
this.button5.Text = "C";
this.button5.UseVisualStyleBackColor = true;
this.button5.Click += new System.EventHandler(this.button5_Click);
//
// button6
//
this.button6.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button6.Location = new System.Drawing.Point(175, 124);
this.button6.Name = "button6";
this.button6.Size = new System.Drawing.Size(45, 45);
this.button6.TabIndex = 8;
this.button6.Text = "*";
this.button6.UseVisualStyleBackColor = true;
this.button6.Click += new System.EventHandler(this.operator_click);
//
// button7
//
this.button7.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button7.Location = new System.Drawing.Point(124, 124);
this.button7.Name = "button7";
this.button7.Size = new System.Drawing.Size(45, 45);
this.button7.TabIndex = 7;
this.button7.Text = "6";
this.button7.UseVisualStyleBackColor = true;
this.button7.Click += new System.EventHandler(this.button_click);
//
// button8
//
this.button8.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button8.Location = new System.Drawing.Point(73, 124);
this.button8.Name = "button8";
this.button8.Size = new System.Drawing.Size(45, 45);
this.button8.TabIndex = 6;
this.button8.Text = "5";
this.button8.UseVisualStyleBackColor = true;
this.button8.Click += new System.EventHandler(this.button_click);
//
// button9
//
this.button9.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button9.Location = new System.Drawing.Point(22, 124);
this.button9.Name = "button9";
this.button9.Size = new System.Drawing.Size(45, 45);
this.button9.TabIndex = 5;
this.button9.Text = "4";
this.button9.UseVisualStyleBackColor = true;
this.button9.Click += new System.EventHandler(this.button_click);
//
// button11
//
this.button11.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button11.Location = new System.Drawing.Point(175, 175);
this.button11.Name = "button11";
this.button11.Size = new System.Drawing.Size(45, 45);
this.button11.TabIndex = 13;
this.button11.Text = "-";
this.button11.UseVisualStyleBackColor = true;
this.button11.Click += new System.EventHandler(this.operator_click);
//
// button12
//
this.button12.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button12.Location = new System.Drawing.Point(124, 175);
this.button12.Name = "button12";
this.button12.Size = new System.Drawing.Size(45, 45);
this.button12.TabIndex = 12;
this.button12.Text = "3";
this.button12.UseVisualStyleBackColor = true;
this.button12.Click += new System.EventHandler(this.button_click);
//
// button13
//
this.button13.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button13.Location = new System.Drawing.Point(73, 175);
this.button13.Name = "button13";
this.button13.Size = new System.Drawing.Size(45, 45);
this.button13.TabIndex = 11;
this.button13.Text = "2";
this.button13.UseVisualStyleBackColor = true;
this.button13.Click += new System.EventHandler(this.button_click);
//
// button14
//
this.button14.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button14.Location = new System.Drawing.Point(22, 175);
this.button14.Name = "button14";
this.button14.Size = new System.Drawing.Size(45, 45);
this.button14.TabIndex = 10;
this.button14.Text = "1";
this.button14.UseVisualStyleBackColor = true;
this.button14.Click += new System.EventHandler(this.button_click);
//
// button15
//
this.button15.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button15.Location = new System.Drawing.Point(226, 175);
this.button15.Name = "button15";
this.button15.Size = new System.Drawing.Size(53, 96);
this.button15.TabIndex = 19;
this.button15.Text = "=";
this.button15.UseVisualStyleBackColor = true;
this.button15.Click += new System.EventHandler(this.button15_Click);
//
// button16
//
this.button16.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button16.Location = new System.Drawing.Point(175, 226);
this.button16.Name = "button16";
this.button16.Size = new System.Drawing.Size(45, 45);
this.button16.TabIndex = 18;
this.button16.Text = "+";
this.button16.UseVisualStyleBackColor = true;
this.button16.Click += new System.EventHandler(this.operator_click);
//
// button17
//
this.button17.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button17.Location = new System.Drawing.Point(124, 226);
this.button17.Name = "button17";
this.button17.Size = new System.Drawing.Size(45, 45);
this.button17.TabIndex = 17;
this.button17.Text = ".";
this.button17.UseVisualStyleBackColor = true;
this.button17.Click += new System.EventHandler(this.button_click);
//
// button19
//
this.button19.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button19.Location = new System.Drawing.Point(22, 226);
this.button19.Name = "button19";
this.button19.Size = new System.Drawing.Size(96, 45);
this.button19.TabIndex = 15;
this.button19.Text = "0";
this.button19.UseVisualStyleBackColor = true;
this.button19.Click += new System.EventHandler(this.button_click);
//
// textBox_Result
//
this.textBox_Result.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.textBox_Result.Location = new System.Drawing.Point(22, 40);
this.textBox_Result.Name = "textBox_Result";
this.textBox_Result.Size = new System.Drawing.Size(257, 29);
this.textBox_Result.TabIndex = 20;
this.textBox_Result.Text = "0";
this.textBox_Result.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
//
// labelCurrentOperation
//
this.labelCurrentOperation.AutoSize = true;
this.labelCurrentOperation.BackColor = System.Drawing.SystemColors.Window;
this.labelCurrentOperation.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.labelCurrentOperation.ForeColor = System.Drawing.SystemColors.ControlDark;
this.labelCurrentOperation.Location = new System.Drawing.Point(18, 13);
this.labelCurrentOperation.Name = "labelCurrentOperation";
this.labelCurrentOperation.Size = new System.Drawing.Size(0, 24);
this.labelCurrentOperation.TabIndex = 21;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(305, 291);
this.Controls.Add(this.labelCurrentOperation);
this.Controls.Add(this.textBox_Result);
this.Controls.Add(this.button15);
this.Controls.Add(this.button16);
this.Controls.Add(this.button17);
this.Controls.Add(this.button19);
this.Controls.Add(this.button11);
this.Controls.Add(this.button12);
this.Controls.Add(this.button13);
this.Controls.Add(this.button14);
this.Controls.Add(this.button5);
this.Controls.Add(this.button6);
this.Controls.Add(this.button7);
this.Controls.Add(this.button8);
this.Controls.Add(this.button9);
this.Controls.Add(this.button4);
this.Controls.Add(this.button3);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.buttonOne);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.MaximizeBox = false;
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Calculator";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button buttonOne;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.Button button5;
private System.Windows.Forms.Button button6;
private System.Windows.Forms.Button button7;
private System.Windows.Forms.Button button8;
private System.Windows.Forms.Button button9;
private System.Windows.Forms.Button button11;
private System.Windows.Forms.Button button12;
private System.Windows.Forms.Button button13;
private System.Windows.Forms.Button button14;
private System.Windows.Forms.Button button15;
private System.Windows.Forms.Button button16;
private System.Windows.Forms.Button button17;
private System.Windows.Forms.Button button19;
private System.Windows.Forms.TextBox textBox_Result;
private System.Windows.Forms.Label labelCurrentOperation;
}
}
Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
namespace Calculator
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
Try doing 1+2+3- and see the result.
Can you tell me the fix.
I try debugging it but i am somehow not able to fix it
thank you
That would be a good challenge for you. 🙂
good one
why after clicking (=) if u try to do an operation with the last result program first do ur last operation like 1+5=6
now try to do operation ur number become 12 why?