Calculator in C# with Source Code: In this project we will learn how to make a calculator in c# windows form application in C# with code and project
Let’s see the working program and code of creating calculator in C#. You can see project.zip at the end of the post.
Program:
Code:
Form1.cs
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public partial class Form1 : Form { bool operandPerformed = false; string operand = ""; double result = 0; public Form1() { InitializeComponent(); } private void NumEvent(object sender, EventArgs e) { if (txtResult.Text == "0" || operandPerformed) txtResult.Clear(); Button btn = (Button)sender; txtResult.Text += btn.Text; operandPerformed = false; } private void OperandEvent(object sender, EventArgs e) { operandPerformed = true; Button btn = (Button)sender; string newOperand = btn.Text; lbResult.Text = lbResult.Text + " " + txtResult.Text + " " + newOperand; switch(operand) { case "+":txtResult.Text = (result + Double.Parse(txtResult.Text)).ToString();break; case "-": txtResult.Text = (result - Double.Parse(txtResult.Text)).ToString(); break; case "*": txtResult.Text = (result * Double.Parse(txtResult.Text)).ToString(); break; case "/": txtResult.Text = (result / Double.Parse(txtResult.Text)).ToString(); break; default:break; } result = Double.Parse(txtResult.Text); operand = newOperand; } private void bCE_Click(object sender, EventArgs e) { txtResult.Text = "0"; } private void bC_Click(object sender, EventArgs e) { txtResult.Text = "0"; lbResult.Text = ""; result = 0; operand = ""; } private void bEq_Click(object sender, EventArgs e) { lbResult.Text = ""; operandPerformed = true; switch(operand) { case "+": txtResult.Text = (result + Double.Parse(txtResult.Text)).ToString(); break; case "-": txtResult.Text = (result - Double.Parse(txtResult.Text)).ToString(); break; case "*": txtResult.Text = (result * Double.Parse(txtResult.Text)).ToString(); break; case "/": txtResult.Text = (result / Double.Parse(txtResult.Text)).ToString(); break; default: break; } result = Double.Parse(txtResult.Text); txtResult.Text = result.ToString(); result = 0; operand = ""; } private void button15_Click(object sender, EventArgs e) { if(!operandPerformed && !txtResult.Text.Contains(",")) { txtResult.Text += ","; } else if(operandPerformed) { txtResult.Text = "0"; } if(!txtResult.Text.Contains(",")) { txtResult.Text += ","; } operandPerformed = false; } } |
Form1.Designer.cs
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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() { this.b7 = new System.Windows.Forms.Button(); this.txtResult = new System.Windows.Forms.TextBox(); this.lbResult = new System.Windows.Forms.Label(); this.b8 = new System.Windows.Forms.Button(); this.b9 = new System.Windows.Forms.Button(); this.bDiv = new System.Windows.Forms.Button(); this.b4 = new System.Windows.Forms.Button(); this.b5 = new System.Windows.Forms.Button(); this.b6 = new System.Windows.Forms.Button(); this.bMul = new System.Windows.Forms.Button(); this.b1 = new System.Windows.Forms.Button(); this.b2 = new System.Windows.Forms.Button(); this.b3 = new System.Windows.Forms.Button(); this.bSub = new System.Windows.Forms.Button(); this.b0 = new System.Windows.Forms.Button(); this.bEq = new System.Windows.Forms.Button(); this.button15 = new System.Windows.Forms.Button(); this.bAdd = new System.Windows.Forms.Button(); this.bCE = new System.Windows.Forms.Button(); this.bC = new System.Windows.Forms.Button(); this.SuspendLayout(); // // b7 // this.b7.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b7.Location = new System.Drawing.Point(69, 107); this.b7.Name = "b7"; this.b7.Size = new System.Drawing.Size(73, 66); this.b7.TabIndex = 0; this.b7.Text = "7"; this.b7.UseVisualStyleBackColor = true; this.b7.Click += new System.EventHandler(this.NumEvent); // // txtResult // this.txtResult.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.txtResult.Location = new System.Drawing.Point(69, 72); this.txtResult.Name = "txtResult"; this.txtResult.Size = new System.Drawing.Size(391, 24); this.txtResult.TabIndex = 1; this.txtResult.Text = "0"; // // lbResult // this.lbResult.AutoSize = true; this.lbResult.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.lbResult.Location = new System.Drawing.Point(66, 56); this.lbResult.Name = "lbResult"; this.lbResult.Size = new System.Drawing.Size(0, 18); this.lbResult.TabIndex = 2; // // b8 // this.b8.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b8.Location = new System.Drawing.Point(148, 107); this.b8.Name = "b8"; this.b8.Size = new System.Drawing.Size(73, 66); this.b8.TabIndex = 0; this.b8.Text = "8"; this.b8.UseVisualStyleBackColor = true; this.b8.Click += new System.EventHandler(this.NumEvent); // // b9 // this.b9.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b9.Location = new System.Drawing.Point(227, 107); this.b9.Name = "b9"; this.b9.Size = new System.Drawing.Size(73, 66); this.b9.TabIndex = 0; this.b9.Text = "9"; this.b9.UseVisualStyleBackColor = true; this.b9.Click += new System.EventHandler(this.NumEvent); // // bDiv // this.bDiv.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bDiv.Location = new System.Drawing.Point(306, 107); this.bDiv.Name = "bDiv"; this.bDiv.Size = new System.Drawing.Size(73, 66); this.bDiv.TabIndex = 0; this.bDiv.Text = "/"; this.bDiv.UseVisualStyleBackColor = true; this.bDiv.Click += new System.EventHandler(this.OperandEvent); // // b4 // this.b4.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b4.Location = new System.Drawing.Point(69, 179); this.b4.Name = "b4"; this.b4.Size = new System.Drawing.Size(73, 66); this.b4.TabIndex = 0; this.b4.Text = "4"; this.b4.UseVisualStyleBackColor = true; this.b4.Click += new System.EventHandler(this.NumEvent); // // b5 // this.b5.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b5.Location = new System.Drawing.Point(148, 179); this.b5.Name = "b5"; this.b5.Size = new System.Drawing.Size(73, 66); this.b5.TabIndex = 0; this.b5.Text = "5"; this.b5.UseVisualStyleBackColor = true; this.b5.Click += new System.EventHandler(this.NumEvent); // // b6 // this.b6.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b6.Location = new System.Drawing.Point(227, 179); this.b6.Name = "b6"; this.b6.Size = new System.Drawing.Size(73, 66); this.b6.TabIndex = 0; this.b6.Text = "6"; this.b6.UseVisualStyleBackColor = true; this.b6.Click += new System.EventHandler(this.NumEvent); // // bMul // this.bMul.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bMul.Location = new System.Drawing.Point(306, 179); this.bMul.Name = "bMul"; this.bMul.Size = new System.Drawing.Size(73, 66); this.bMul.TabIndex = 0; this.bMul.Text = "*"; this.bMul.UseVisualStyleBackColor = true; this.bMul.Click += new System.EventHandler(this.OperandEvent); // // b1 // this.b1.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b1.Location = new System.Drawing.Point(69, 251); this.b1.Name = "b1"; this.b1.Size = new System.Drawing.Size(73, 66); this.b1.TabIndex = 0; this.b1.Text = "1"; this.b1.UseVisualStyleBackColor = true; this.b1.Click += new System.EventHandler(this.NumEvent); // // b2 // this.b2.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b2.Location = new System.Drawing.Point(148, 251); this.b2.Name = "b2"; this.b2.Size = new System.Drawing.Size(73, 66); this.b2.TabIndex = 0; this.b2.Text = "2"; this.b2.UseVisualStyleBackColor = true; this.b2.Click += new System.EventHandler(this.NumEvent); // // b3 // this.b3.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b3.Location = new System.Drawing.Point(227, 251); this.b3.Name = "b3"; this.b3.Size = new System.Drawing.Size(73, 66); this.b3.TabIndex = 0; this.b3.Text = "3"; this.b3.UseVisualStyleBackColor = true; this.b3.Click += new System.EventHandler(this.NumEvent); // // bSub // this.bSub.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bSub.Location = new System.Drawing.Point(306, 251); this.bSub.Name = "bSub"; this.bSub.Size = new System.Drawing.Size(73, 66); this.bSub.TabIndex = 0; this.bSub.Text = "-"; this.bSub.UseVisualStyleBackColor = true; this.bSub.Click += new System.EventHandler(this.OperandEvent); // // b0 // this.b0.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.b0.Location = new System.Drawing.Point(69, 323); this.b0.Name = "b0"; this.b0.Size = new System.Drawing.Size(152, 66); this.b0.TabIndex = 0; this.b0.Text = "0"; this.b0.UseVisualStyleBackColor = true; this.b0.Click += new System.EventHandler(this.NumEvent); // // bEq // this.bEq.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bEq.Location = new System.Drawing.Point(387, 251); this.bEq.Name = "bEq"; this.bEq.Size = new System.Drawing.Size(73, 138); this.bEq.TabIndex = 0; this.bEq.Text = "="; this.bEq.UseVisualStyleBackColor = true; this.bEq.Click += new System.EventHandler(this.bEq_Click); // // button15 // this.button15.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.button15.Location = new System.Drawing.Point(227, 323); this.button15.Name = "button15"; this.button15.Size = new System.Drawing.Size(73, 66); this.button15.TabIndex = 0; this.button15.Text = ","; this.button15.UseVisualStyleBackColor = true; this.button15.Click += new System.EventHandler(this.button15_Click); // // bAdd // this.bAdd.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bAdd.Location = new System.Drawing.Point(306, 323); this.bAdd.Name = "bAdd"; this.bAdd.Size = new System.Drawing.Size(73, 66); this.bAdd.TabIndex = 0; this.bAdd.Text = "+"; this.bAdd.UseVisualStyleBackColor = true; this.bAdd.Click += new System.EventHandler(this.OperandEvent); // // bCE // this.bCE.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bCE.Location = new System.Drawing.Point(387, 107); this.bCE.Name = "bCE"; this.bCE.Size = new System.Drawing.Size(73, 66); this.bCE.TabIndex = 0; this.bCE.Text = "CE"; this.bCE.UseVisualStyleBackColor = true; this.bCE.Click += new System.EventHandler(this.bCE_Click); // // bC // this.bC.Font = new System.Drawing.Font("Microsoft Sans Serif", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(162))); this.bC.Location = new System.Drawing.Point(387, 179); this.bC.Name = "bC"; this.bC.Size = new System.Drawing.Size(73, 66); this.bC.TabIndex = 0; this.bC.Text = "C"; this.bC.UseVisualStyleBackColor = true; this.bC.Click += new System.EventHandler(this.bC_Click); // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(524, 487); this.Controls.Add(this.lbResult); this.Controls.Add(this.txtResult); this.Controls.Add(this.bAdd); this.Controls.Add(this.bSub); this.Controls.Add(this.bMul); this.Controls.Add(this.bDiv); this.Controls.Add(this.button15); this.Controls.Add(this.b3); this.Controls.Add(this.b6); this.Controls.Add(this.b9); this.Controls.Add(this.bC); this.Controls.Add(this.bCE); this.Controls.Add(this.bEq); this.Controls.Add(this.b0); this.Controls.Add(this.b2); this.Controls.Add(this.b1); this.Controls.Add(this.b5); this.Controls.Add(this.b4); this.Controls.Add(this.b8); this.Controls.Add(this.b7); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.Button b7; private System.Windows.Forms.TextBox txtResult; private System.Windows.Forms.Label lbResult; private System.Windows.Forms.Button b8; private System.Windows.Forms.Button b9; private System.Windows.Forms.Button bDiv; private System.Windows.Forms.Button b4; private System.Windows.Forms.Button b5; private System.Windows.Forms.Button b6; private System.Windows.Forms.Button bMul; private System.Windows.Forms.Button b1; private System.Windows.Forms.Button b2; private System.Windows.Forms.Button b3; private System.Windows.Forms.Button bSub; private System.Windows.Forms.Button b0; private System.Windows.Forms.Button bEq; private System.Windows.Forms.Button button15; private System.Windows.Forms.Button bAdd; private System.Windows.Forms.Button bCE; private System.Windows.Forms.Button bC; } |
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