Calculator in C#

If you want to build simple calculator in c# programming language then, You are in the right place.

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace Moder_Machine_Calc

{

public partial class Form1 : Form

{

//Global Variables

string number1;

string number2;

string op;

string input;

int countRepeat;



Calculator obj = new Calculator(); //calculator object is created

public Form1()

{

InitializeComponent();

}

private void number_Click(object sender, EventArgs e)

{





if (((Button)sender).Text == "+/-")

{

input = (-Convert.ToDouble(txtDisplay.Text)).ToString();



}

else

{

input += ((Button)sender).Text; //Type cast ..button object

txtDisplay.Text = input;

}



}

private void Operator_Click(object sender, EventArgs e)

{

countRepeat = 0;

number1 = input;

op = ((Button)sender).Text;

input = "";

txtDisplay.Text = "";

op = ((Button)sender).Text;

if (op == "Sqrt")

{

obj.Number1 = Convert.ToDouble(number1);

if (op == "Sqrt")

{

obj.squaroot();

txtDisplay.Text = obj.Result.ToString();

}

}



}

private void btnEqual_Click(object sender, EventArgs e)

{

countRepeat++;

if (countRepeat == 1)

{

number2 = txtDisplay.Text;

input = "";

}

else if(countRepeat >1)

{

number1 = txtDisplay.Text;

}



obj.Number1 = Convert.ToDouble(number1);

obj.Number2 = Convert.ToDouble(number2);

obj.Op = Convert.ToChar(op);

if (op == "+")

{

obj.Add();

input = "";

txtDisplay.Text = "";

}

else if (op == "-")

{

obj.Subtract();

}

else if (op == "*")

{

obj.product();

}

else if (op == "/")

{

obj.divide();

}







　

txtDisplay.Text = obj.Result.ToString();

}

private void btnClear_Click(object sender, EventArgs e)

{//clear

txtDisplay.Clear();

number1 ="";

number2 = "";

input = "";

}

private void btnBack_Click(object sender, EventArgs e)

{

if (txtDisplay.Text.Length != 0)

{

input = txtDisplay.Text.Remove(txtDisplay.Text.Length - 1);

}

else

{

input = "";

}

txtDisplay.Text = input;



}

private void btnFrac_Click(object sender, EventArgs e)

{

number1 = input;

op = ((Button)sender).Text;

if (op == "1/x")

{

obj.Number1 = Convert.ToDouble(number1);

if (op == "1/x")

{

obj.reciprocal();

txtDisplay.Text = obj.Result.ToString();

}

}

}


}

}

Designer form :
namespace Moder_Machine_Calc

{

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.txtDisplay = new System.Windows.Forms.TextBox();

this.btnBack = new System.Windows.Forms.Button();

this.btnClear = new System.Windows.Forms.Button();

this.btn7 = new System.Windows.Forms.Button();

this.btn8 = new System.Windows.Forms.Button();

this.btn9 = new System.Windows.Forms.Button();

this.btn4 = new System.Windows.Forms.Button();

this.btn5 = new System.Windows.Forms.Button();

this.btn6 = new System.Windows.Forms.Button();

this.btn1 = new System.Windows.Forms.Button();

this.btn2 = new System.Windows.Forms.Button();

this.btn3 = new System.Windows.Forms.Button();

this.btn0 = new System.Windows.Forms.Button();

this.button13 = new System.Windows.Forms.Button();

this.button14 = new System.Windows.Forms.Button();

this.btnDiv = new System.Windows.Forms.Button();

this.btnPro = new System.Windows.Forms.Button();

this.btnSub = new System.Windows.Forms.Button();

this.btnAdd = new System.Windows.Forms.Button();

this.btnSqrt = new System.Windows.Forms.Button();

this.btnFrac = new System.Windows.Forms.Button();

this.btnEqual = new System.Windows.Forms.Button();

this.SuspendLayout();

//

// txtDisplay

//

this.txtDisplay.BackColor = System.Drawing.SystemColors.AppWorkspace;

this.txtDisplay.Font = new System.Drawing.Font("Microsoft Sans Serif", 15.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.txtDisplay.ForeColor = System.Drawing.SystemColors.InfoText;

this.txtDisplay.Location = new System.Drawing.Point(17, 16);

this.txtDisplay.Margin = new System.Windows.Forms.Padding(4);

this.txtDisplay.Multiline = true;

this.txtDisplay.Name = "txtDisplay";

this.txtDisplay.ReadOnly = true;

this.txtDisplay.Size = new System.Drawing.Size(327, 44);

this.txtDisplay.TabIndex = 0;

this.txtDisplay.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;

//

// btnBack

//

this.btnBack.ForeColor = System.Drawing.Color.Red;

this.btnBack.Location = new System.Drawing.Point(17, 68);

this.btnBack.Margin = new System.Windows.Forms.Padding(4);

this.btnBack.Name = "btnBack";

this.btnBack.Size = new System.Drawing.Size(115, 37);

this.btnBack.TabIndex = 1;

this.btnBack.Text = "Back";

this.btnBack.UseVisualStyleBackColor = true;

this.btnBack.Click += new System.EventHandler(this.btnBack_Click);

//

// btnClear

//

this.btnClear.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.btnClear.ForeColor = System.Drawing.Color.Red;

this.btnClear.Location = new System.Drawing.Point(231, 68);

this.btnClear.Margin = new System.Windows.Forms.Padding(4);

this.btnClear.Name = "btnClear";

this.btnClear.Size = new System.Drawing.Size(115, 37);

this.btnClear.TabIndex = 2;

this.btnClear.Text = "Clear";

this.btnClear.UseVisualStyleBackColor = true;

this.btnClear.Click += new System.EventHandler(this.btnClear_Click);

//

// btn7

//

this.btn7.Location = new System.Drawing.Point(17, 133);

this.btn7.Name = "btn7";

this.btn7.Size = new System.Drawing.Size(47, 39);

this.btn7.TabIndex = 3;

this.btn7.Text = "7";

this.btn7.UseVisualStyleBackColor = true;

this.btn7.Click += new System.EventHandler(this.number_Click);

//

// btn8

//

this.btn8.Location = new System.Drawing.Point(85, 133);

this.btn8.Name = "btn8";

this.btn8.Size = new System.Drawing.Size(47, 39);

this.btn8.TabIndex = 4;

this.btn8.Text = "8";

this.btn8.UseVisualStyleBackColor = true;

this.btn8.Click += new System.EventHandler(this.number_Click);

//

// btn9

//

this.btn9.Location = new System.Drawing.Point(147, 133);

this.btn9.Name = "btn9";

this.btn9.Size = new System.Drawing.Size(47, 39);

this.btn9.TabIndex = 5;

this.btn9.Text = "9";

this.btn9.UseVisualStyleBackColor = true;

this.btn9.Click += new System.EventHandler(this.number_Click);

//

// btn4

//

this.btn4.Location = new System.Drawing.Point(17, 178);

this.btn4.Name = "btn4";

this.btn4.Size = new System.Drawing.Size(47, 39);

this.btn4.TabIndex = 6;

this.btn4.Text = "4";

this.btn4.UseVisualStyleBackColor = true;

this.btn4.Click += new System.EventHandler(this.number_Click);

//

// btn5

//

this.btn5.Location = new System.Drawing.Point(85, 178);

this.btn5.Name = "btn5";

this.btn5.Size = new System.Drawing.Size(47, 39);

this.btn5.TabIndex = 7;

this.btn5.Text = "5";

this.btn5.UseVisualStyleBackColor = true;

this.btn5.Click += new System.EventHandler(this.number_Click);

//

// btn6

//

this.btn6.Location = new System.Drawing.Point(147, 178);

this.btn6.Name = "btn6";

this.btn6.Size = new System.Drawing.Size(47, 39);

this.btn6.TabIndex = 8;

this.btn6.Text = "6";

this.btn6.UseVisualStyleBackColor = true;

this.btn6.Click += new System.EventHandler(this.number_Click);

//

// btn1

//

this.btn1.Location = new System.Drawing.Point(17, 223);

this.btn1.Name = "btn1";

this.btn1.Size = new System.Drawing.Size(47, 39);

this.btn1.TabIndex = 9;

this.btn1.Text = "1";

this.btn1.UseVisualStyleBackColor = true;

this.btn1.Click += new System.EventHandler(this.number_Click);

//

// btn2

//

this.btn2.Location = new System.Drawing.Point(85, 223);

this.btn2.Name = "btn2";

this.btn2.Size = new System.Drawing.Size(47, 39);

this.btn2.TabIndex = 10;

this.btn2.Text = "2";

this.btn2.UseVisualStyleBackColor = true;

this.btn2.Click += new System.EventHandler(this.number_Click);

//

// btn3

//

this.btn3.Location = new System.Drawing.Point(147, 223);

this.btn3.Name = "btn3";

this.btn3.Size = new System.Drawing.Size(47, 39);

this.btn3.TabIndex = 11;

this.btn3.Text = "3";

this.btn3.UseVisualStyleBackColor = true;

this.btn3.Click += new System.EventHandler(this.number_Click);

//

// btn0

//

this.btn0.Location = new System.Drawing.Point(17, 270);

this.btn0.Name = "btn0";

this.btn0.Size = new System.Drawing.Size(47, 39);

this.btn0.TabIndex = 12;

this.btn0.Text = "0";

this.btn0.UseVisualStyleBackColor = true;

this.btn0.Click += new System.EventHandler(this.number_Click);

//

// button13

//

this.button13.Location = new System.Drawing.Point(85, 270);

this.button13.Name = "button13";

this.button13.Size = new System.Drawing.Size(47, 39);

this.button13.TabIndex = 13;

this.button13.Text = "+/-";

this.button13.UseVisualStyleBackColor = true;

this.button13.Click += new System.EventHandler(this.number_Click);

//

// button14

//

this.button14.Font = new System.Drawing.Font("Microsoft Sans Serif", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.button14.Location = new System.Drawing.Point(147, 270);

this.button14.Name = "button14";

this.button14.Size = new System.Drawing.Size(47, 39);

this.button14.TabIndex = 14;

this.button14.Text = ".";

this.button14.UseVisualStyleBackColor = true;

this.button14.Click += new System.EventHandler(this.number_Click);

//

// btnDiv

//

this.btnDiv.BackColor = System.Drawing.SystemColors.Control;

this.btnDiv.Font = new System.Drawing.Font("Microsoft Sans Serif", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.btnDiv.ForeColor = System.Drawing.Color.Red;

this.btnDiv.Location = new System.Drawing.Point(222, 133);

this.btnDiv.Name = "btnDiv";

this.btnDiv.Size = new System.Drawing.Size(47, 39);

this.btnDiv.TabIndex = 15;

this.btnDiv.Text = "/";

this.btnDiv.UseVisualStyleBackColor = false;

this.btnDiv.Click += new System.EventHandler(this.Operator_Click);

//

// btnPro

//

this.btnPro.Font = new System.Drawing.Font("Microsoft Sans Serif", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.btnPro.ForeColor = System.Drawing.Color.Red;

this.btnPro.Location = new System.Drawing.Point(222, 178);

this.btnPro.Name = "btnPro";

this.btnPro.Size = new System.Drawing.Size(47, 39);

this.btnPro.TabIndex = 16;

this.btnPro.Text = "*";

this.btnPro.UseVisualStyleBackColor = true;

this.btnPro.Click += new System.EventHandler(this.Operator_Click);

//

// btnSub

//

this.btnSub.Font = new System.Drawing.Font("Microsoft Sans Serif", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.btnSub.ForeColor = System.Drawing.Color.Red;

this.btnSub.Location = new System.Drawing.Point(222, 223);

this.btnSub.Name = "btnSub";

this.btnSub.Size = new System.Drawing.Size(47, 39);

this.btnSub.TabIndex = 17;

this.btnSub.Text = "-";

this.btnSub.UseVisualStyleBackColor = true;

this.btnSub.Click += new System.EventHandler(this.Operator_Click);

//

// btnAdd

//

this.btnAdd.Font = new System.Drawing.Font("Microsoft Sans Serif", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.btnAdd.ForeColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(0)))), ((int)(((byte)(0)))));

this.btnAdd.Location = new System.Drawing.Point(222, 268);

this.btnAdd.Name = "btnAdd";

this.btnAdd.Size = new System.Drawing.Size(47, 39);

this.btnAdd.TabIndex = 18;

this.btnAdd.Text = "+";

this.btnAdd.UseVisualStyleBackColor = true;

this.btnAdd.Click += new System.EventHandler(this.Operator_Click);

//

// btnSqrt

//

this.btnSqrt.Location = new System.Drawing.Point(297, 133);

this.btnSqrt.Name = "btnSqrt";

this.btnSqrt.Size = new System.Drawing.Size(47, 39);

this.btnSqrt.TabIndex = 19;

this.btnSqrt.Text = "Sqrt";

this.btnSqrt.UseVisualStyleBackColor = true;

this.btnSqrt.Click += new System.EventHandler(this.Operator_Click);

//

// btnFrac

//

this.btnFrac.Location = new System.Drawing.Point(297, 178);

this.btnFrac.Name = "btnFrac";

this.btnFrac.Size = new System.Drawing.Size(47, 39);

this.btnFrac.TabIndex = 20;

this.btnFrac.Text = "1/x";

this.btnFrac.UseVisualStyleBackColor = true;

this.btnFrac.Click += new System.EventHandler(this.btnFrac_Click);

//

// btnEqual

//

this.btnEqual.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.btnEqual.ForeColor = System.Drawing.Color.Red;

this.btnEqual.Location = new System.Drawing.Point(297, 223);

this.btnEqual.Name = "btnEqual";

this.btnEqual.Size = new System.Drawing.Size(47, 84);

this.btnEqual.TabIndex = 21;

this.btnEqual.Text = "=";

this.btnEqual.UseVisualStyleBackColor = true;

this.btnEqual.Click += new System.EventHandler(this.btnEqual_Click);

//

// Form1

//

this.AcceptButton = this.btnEqual;

this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(365, 326);

this.Controls.Add(this.btnEqual);

this.Controls.Add(this.btnFrac);

this.Controls.Add(this.btnSqrt);

this.Controls.Add(this.btnAdd);

this.Controls.Add(this.btnSub);

this.Controls.Add(this.btnPro);

this.Controls.Add(this.btnDiv);

this.Controls.Add(this.button14);

this.Controls.Add(this.button13);

this.Controls.Add(this.btn0);

this.Controls.Add(this.btn3);

this.Controls.Add(this.btn2);

this.Controls.Add(this.btn1);

this.Controls.Add(this.btn6);

this.Controls.Add(this.btn5);

this.Controls.Add(this.btn4);

this.Controls.Add(this.btn9);

this.Controls.Add(this.btn8);

this.Controls.Add(this.btn7);

this.Controls.Add(this.btnClear);

this.Controls.Add(this.btnBack);

this.Controls.Add(this.txtDisplay);

this.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));

this.Margin = new System.Windows.Forms.Padding(4);

this.MaximizeBox = false;

this.Name = "Form1";

this.Text = "Simple dCalculator";

this.ResumeLayout(false);

this.PerformLayout();

}

#endregion

private System.Windows.Forms.TextBox txtDisplay;

private System.Windows.Forms.Button btnBack;

private System.Windows.Forms.Button btnClear;

private System.Windows.Forms.Button btn7;

private System.Windows.Forms.Button btn8;

private System.Windows.Forms.Button btn9;

private System.Windows.Forms.Button btn4;

private System.Windows.Forms.Button btn5;

private System.Windows.Forms.Button btn6;

private System.Windows.Forms.Button btn1;

private System.Windows.Forms.Button btn2;

private System.Windows.Forms.Button btn3;

private System.Windows.Forms.Button btn0;

private System.Windows.Forms.Button button13;

private System.Windows.Forms.Button button14;

private System.Windows.Forms.Button btnDiv;

private System.Windows.Forms.Button btnPro;

private System.Windows.Forms.Button btnSub;

private System.Windows.Forms.Button btnAdd;

private System.Windows.Forms.Button btnSqrt;

private System.Windows.Forms.Button btnFrac;

private System.Windows.Forms.Button btnEqual;

}

}

Copy the class: calculatorclass ()

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms; //using system.Windows.Forms;

namespace Moder_Machine_Calc

{

class Calculator

{

//Fields

private double number1;

private double number2;

private char op;

private double result;

　

//Empty Constructor

public Calculator(){}

//Custom Construtor

public Calculator(double n1, double n2, char op)

{

number1 = n1;

number2 = n2;

this.op = op; //this.op is field value ^^^^^^^ op is operator.

//use can use this above

}

//Properties

public double Number1

{

get

{

return number1;

}

set

{

number1 = value;

}

}

public double Number2

{

get

{

return number2;

}

set

{

number2 = value;

}

}

public char Op

{

get {

return op;

}

set

{

op = value;

}

}

public double Result

{

get

{

return result;

}

set

{

result = value;

}

}

//Methods

public void Add()

{

result = number1 + number2;

}

public void Subtract()

{

result = number1 - number2;

}

public void product()

{

result = number1 * number2;

}

public void divide()

{

result = number1 / number2;

}

public void reciprocal()

{

try

{

result = 1 / number1;

}

catch

{

MessageBox.Show("Cannot be dividede by Zeor", "Infinity Error");

}

}

public void squaroot()

{

result = Math.Sqrt(number1);

}

public string DisplayResult()

{

return result.ToString();

}



}

}