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

namespace calc
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Calculator1 : System.Windows.Forms.Form
	{
        private System.Windows.Forms.Button btn1;
        private System.Windows.Forms.Button btn2;
        private System.Windows.Forms.Button btn3;
        private System.Windows.Forms.Button btn4;
        private System.Windows.Forms.Button btn5;
        private System.Windows.Forms.Button btn6;
        private System.Windows.Forms.Button btn7;
        private System.Windows.Forms.Button btn8;
        private System.Windows.Forms.Button btn9;
        private System.Windows.Forms.Button btn0;
        private System.Windows.Forms.Button btnAdd;
        private System.Windows.Forms.Button btnSubtract;
        private System.Windows.Forms.Button btnMultiply;
        private System.Windows.Forms.Button btnDivide;
        private System.Windows.Forms.TextBox txtResult;
        private System.Windows.Forms.Button btnEquals;
        private System.Windows.Forms.Button btnClear;
        private System.Windows.Forms.Button btnNegative;
        private System.Windows.Forms.Button btnDecimal;

        private int opMain = 0; // 1(加法)  2(減法)  3(乘法)  4(除法)
        private double mainNum1 = 0; // 存儲第一個數
        private double mainNum2 = 0; // 存儲第二個數
        private bool isSecond = false; // 用來判斷輸入的是第一個還是第二個數
        private bool isDone = false; // 用來判斷是否按了等于按鈕
        private bool isDecimal = false; // 用了判斷是否有小數

		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Calculator1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (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.btnSubtract = new System.Windows.Forms.Button();
            this.btnDivide = new System.Windows.Forms.Button();
            this.btnEquals = new System.Windows.Forms.Button();
            this.btnDecimal = new System.Windows.Forms.Button();
            this.btn2 = new System.Windows.Forms.Button();
            this.btn3 = new System.Windows.Forms.Button();
            this.btnClear = new System.Windows.Forms.Button();
            this.btn1 = new System.Windows.Forms.Button();
            this.btn6 = new System.Windows.Forms.Button();
            this.btn7 = new System.Windows.Forms.Button();
            this.btn4 = new System.Windows.Forms.Button();
            this.btn5 = new System.Windows.Forms.Button();
            this.btn8 = new System.Windows.Forms.Button();
            this.btn9 = new System.Windows.Forms.Button();
            this.btnAdd = new System.Windows.Forms.Button();
            this.btnMultiply = new System.Windows.Forms.Button();
            this.btnNegative = new System.Windows.Forms.Button();
            this.btn0 = new System.Windows.Forms.Button();
            this.txtResult = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // btnSubtract
            // 
            this.btnSubtract.Location = new System.Drawing.Point(136, 80);
            this.btnSubtract.Name = "btnSubtract";
            this.btnSubtract.Size = new System.Drawing.Size(32, 32);
            this.btnSubtract.TabIndex = 0;
            this.btnSubtract.TabStop = false;
            this.btnSubtract.Text = "-";
            this.btnSubtract.Click += new System.EventHandler(this.btnSubtract_Click);
            // 
            // btnDivide
            // 
            this.btnDivide.Location = new System.Drawing.Point(136, 160);
            this.btnDivide.Name = "btnDivide";
            this.btnDivide.Size = new System.Drawing.Size(32, 32);
            this.btnDivide.TabIndex = 0;
            this.btnDivide.TabStop = false;
            this.btnDivide.Text = "/";
            this.btnDivide.Click += new System.EventHandler(this.btnDivide_Click);
            // 
            // btnEquals
            // 
            this.btnEquals.Location = new System.Drawing.Point(136, 200);
            this.btnEquals.Name = "btnEquals";
            this.btnEquals.Size = new System.Drawing.Size(32, 32);
            this.btnEquals.TabIndex = 0;
            this.btnEquals.TabStop = false;
            this.btnEquals.Text = "＝";
            this.btnEquals.Click += new System.EventHandler(this.btnEquals_Click);
            // 
            // btnDecimal
            // 
            this.btnDecimal.Location = new System.Drawing.Point(88, 200);
            this.btnDecimal.Name = "btnDecimal";
            this.btnDecimal.Size = new System.Drawing.Size(32, 32);
            this.btnDecimal.TabIndex = 0;
            this.btnDecimal.TabStop = false;
            this.btnDecimal.Text = ".";
            this.btnDecimal.Click += new System.EventHandler(this.btnDecimal_Click);
            // 
            // btn2
            // 
            this.btn2.Location = new System.Drawing.Point(48, 40);
            this.btn2.Name = "btn2";
            this.btn2.Size = new System.Drawing.Size(32, 32);
            this.btn2.TabIndex = 0;
            this.btn2.TabStop = false;
            this.btn2.Text = "2";
            this.btn2.Click += new System.EventHandler(this.btn2_Click);
            // 
            // btn3
            // 
            this.btn3.Location = new System.Drawing.Point(88, 40);
            this.btn3.Name = "btn3";
            this.btn3.Size = new System.Drawing.Size(32, 32);
            this.btn3.TabIndex = 0;
            this.btn3.TabStop = false;
            this.btn3.Text = "3";
            this.btn3.Click += new System.EventHandler(this.btn3_Click);
            // 
            // btnClear
            // 
            this.btnClear.ForeColor = System.Drawing.Color.OrangeRed;
            this.btnClear.Location = new System.Drawing.Point(8, 200);
            this.btnClear.Name = "btnClear";
            this.btnClear.Size = new System.Drawing.Size(32, 32);
            this.btnClear.TabIndex = 0;
            this.btnClear.TabStop = false;
            this.btnClear.Text = "C";
            this.btnClear.Click += new System.EventHandler(this.btnClear_Click);
            // 
            // btn1
            // 
            this.btn1.Location = new System.Drawing.Point(8, 40);
            this.btn1.Name = "btn1";
            this.btn1.Size = new System.Drawing.Size(32, 32);
            this.btn1.TabIndex = 0;
            this.btn1.TabStop = false;
            this.btn1.Text = "1";
            this.btn1.Click += new System.EventHandler(this.btn1_Click);
            // 
            // btn6
            // 
            this.btn6.Location = new System.Drawing.Point(88, 80);
            this.btn6.Name = "btn6";
            this.btn6.Size = new System.Drawing.Size(32, 32);
            this.btn6.TabIndex = 0;
            this.btn6.TabStop = false;
            this.btn6.Text = "6";
            this.btn6.Click += new System.EventHandler(this.btn6_Click);
            // 
            // btn7
            // 
            this.btn7.Location = new System.Drawing.Point(8, 120);
            this.btn7.Name = "btn7";
            this.btn7.Size = new System.Drawing.Size(32, 32);
            this.btn7.TabIndex = 0;
            this.btn7.TabStop = false;
            this.btn7.Text = "7";
            this.btn7.Click += new System.EventHandler(this.btn7_Click);
            // 
            // btn4
            // 
            this.btn4.Location = new System.Drawing.Point(8, 80);
            this.btn4.Name = "btn4";
            this.btn4.Size = new System.Drawing.Size(32, 32);
            this.btn4.TabIndex = 0;
            this.btn4.TabStop = false;
            this.btn4.Text = "4";
            this.btn4.Click += new System.EventHandler(this.btn4_Click);
            // 
            // btn5
            // 
            this.btn5.Location = new System.Drawing.Point(48, 80);
            this.btn5.Name = "btn5";
            this.btn5.Size = new System.Drawing.Size(32, 32);
            this.btn5.TabIndex = 0;
            this.btn5.TabStop = false;
            this.btn5.Text = "5";
            this.btn5.Click += new System.EventHandler(this.btn5_Click);
            // 
            // btn8
            // 
            this.btn8.Location = new System.Drawing.Point(48, 120);
            this.btn8.Name = "btn8";
            this.btn8.Size = new System.Drawing.Size(32, 32);
            this.btn8.TabIndex = 0;
            this.btn8.TabStop = false;
            this.btn8.Text = "8";
            this.btn8.Click += new System.EventHandler(this.btn8_Click);
            // 
            // btn9
            // 
            this.btn9.Location = new System.Drawing.Point(88, 120);
            this.btn9.Name = "btn9";
            this.btn9.Size = new System.Drawing.Size(32, 32);
            this.btn9.TabIndex = 0;
            this.btn9.TabStop = false;
            this.btn9.Text = "9";
            this.btn9.Click += new System.EventHandler(this.btn9_Click);
            // 
            // btnAdd
            // 
            this.btnAdd.Location = new System.Drawing.Point(136, 40);
            this.btnAdd.Name = "btnAdd";
            this.btnAdd.Size = new System.Drawing.Size(32, 32);
            this.btnAdd.TabIndex = 0;
            this.btnAdd.TabStop = false;
            this.btnAdd.Text = "+";
            this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);
            // 
            // btnMultiply
            // 
            this.btnMultiply.Location = new System.Drawing.Point(136, 120);
            this.btnMultiply.Name = "btnMultiply";
            this.btnMultiply.Size = new System.Drawing.Size(32, 32);
            this.btnMultiply.TabIndex = 0;
            this.btnMultiply.TabStop = false;
            this.btnMultiply.Text = "*";
            this.btnMultiply.Click += new System.EventHandler(this.btnMultiply_Click);
            // 
            // btnNegative
            // 
            this.btnNegative.Location = new System.Drawing.Point(48, 200);
            this.btnNegative.Name = "btnNegative";
            this.btnNegative.Size = new System.Drawing.Size(32, 32);
            this.btnNegative.TabIndex = 0;
            this.btnNegative.TabStop = false;
            this.btnNegative.Text = "+/-";
            this.btnNegative.Click += new System.EventHandler(this.btnNegative_Click);
            // 
            // btn0
            // 
            this.btn0.Location = new System.Drawing.Point(48, 160);
            this.btn0.Name = "btn0";
            this.btn0.Size = new System.Drawing.Size(32, 32);
            this.btn0.TabIndex = 0;
            this.btn0.TabStop = false;
            this.btn0.Text = "0";
            this.btn0.Click += new System.EventHandler(this.btn0_Click);
            // 
            // txtResult
            // 
            this.txtResult.Location = new System.Drawing.Point(8, 8);
            this.txtResult.Name = "txtResult";
            this.txtResult.Size = new System.Drawing.Size(160, 21);
            this.txtResult.TabIndex = 1;
            this.txtResult.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            this.txtResult.TextChanged += new System.EventHandler(this.txtResult_TextChanged);
            // 
            // Calculator1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(176, 237);
            this.Controls.Add(this.btnDecimal);
            this.Controls.Add(this.btnNegative);