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;
using?System.Text.Regularexpressions;

namespace?Calculator
{
????public?partial?class?Form1?:?Form
????{
????????double?a?=?0;
????????double?b?=?0;
????????string?d;

????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}

????????private?void?timer1_Tick（object?sender?EventArgs?e）
????????{
????????????toolStripStatusLabel2.Text?=?DateTime.Now.ToString（）;
????????}

????????private?void?Form1_Load（object?sender?EventArgs?e）
????????{
????????????timer1.Start（）;
????????}

????????private?void?btn1_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“1“;
????????}

????????private?void?btn2_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“2“;
????????}

????????private?void?btn3_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“3“;
????????}

????????private?void?btn4_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“4“;
????????}

????????private?void?btn5_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“5“;
????????}

????????private?void?btn6_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“6“;
????????}

????????private?void?btn7_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“7“;
????????}

????????private?void?btn8_Click（object?sender?EventArgs?e）
????????{??????????
????????????textBox1.Text?+=?“8“;
????????}

????????private?void?btn9_Click（object?sender?EventArgs?e）
????????{
????????????
????????????textBox1.Text?+=?“9“;
????????}

????????private?void?btn0_Click（object?sender?EventArgs?e）
????????{
????????????{
????????????????textBox1.Text?+=?“0“;
????????????????if?（d?==?“/“）
????????????????{
????????????????????textBox1.Clear（）;
????????????????????MessageBox.Show（“除數(shù)不能為零“?“錯(cuò)誤提示“?MessageBoxButtons.OK?MessageBoxIcon.Warning）;
????????????????}
????????????}
????????}

????????private?void?btnPoint_Click（object?sender?EventArgs?e）
????????{
????????????textBox1.Text?+=?“.“;
????????}

????????private?void?btnPlus_Click（object?sender?EventArgs?e）
????????{
????????????b?=?double.Parse（textBox1.Text）;
????????????d?=?“+“;
????????????textBox1.Text?=?b?+?“+“;
????????}

????????private?void?btnSub_Click（object?sender?EventArgs?e）
????????{
????????????b?=?double.Parse（textBox1.Text）;
????????????d?=?“-“;
????????????textBox1.Text?=?b?+?“-“;
????????}

????????private?void?btnMul_Click（object?sender?EventArgs?e）
????????{
????????????b?=?double.Parse（textBox1.Text）;
????????????d?=?“*“;
????????????textBox1.Text?=?b?+?“*“;
????????}

????????private?void?btnDiv_Click（object?sender?EventArgs?e）
????????{
????????????b?=?double.Parse（tex

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-27?15:08??Calculator\
?????目錄???????????0??2018-12-27?15:08??Calculator\.vs\
?????目錄???????????0??2018-12-27?15:08??Calculator\.vs\Calculator\
?????目錄???????????0??2018-12-27?15:08??Calculator\.vs\Calculator\v14\
?????文件???????41984??2018-12-27?11:57??Calculator\.vs\Calculator\v14\.suo
?????目錄???????????0??2018-12-27?15:08??Calculator\Calculator\
?????文件?????????997??2018-12-19?11:29??Calculator\Calculator.sln
?????目錄???????????0??2018-12-27?15:08??Calculator\Calculator\bin\
?????目錄???????????0??2018-12-27?15:08??Calculator\Calculator\bin\Debug\
?????文件???????17408??2018-12-27?11:54??Calculator\Calculator\bin\Debug\Calculator.exe
?????文件???????30208??2018-12-27?11:54??Calculator\Calculator\bin\Debug\Calculator.pdb
?????文件???????22688??2018-12-27?11:57??Calculator\Calculator\bin\Debug\Calculator.vshost.exe
?????文件?????????490??2018-04-12?07:35??Calculator\Calculator\bin\Debug\Calculator.vshost.exe.manifest
?????文件????????3734??2018-12-19?20:37??Calculator\Calculator\Calculator.csproj
?????文件????????5590??2018-12-26?21:52??Calculator\Calculator\Form1.cs
?????文件???????19324??2018-12-26?21:51??Calculator\Calculator\Form1.Designer.cs
?????文件????????6212??2018-12-26?21:51??Calculator\Calculator\Form1.resx
?????目錄???????????0??2018-12-27?15:08??Calculator\Calculator\obj\
?????目錄???????????0??2018-12-27?15:08??Calculator\Calculator\obj\Debug\
?????文件?????????770??2018-12-27?11:57??Calculator\Calculator\obj\Debug\Calculator.csproj.FileListAbsolute.txt
?????文件????????1012??2018-12-26?21:51??Calculator\Calculator\obj\Debug\Calculator.csproj.GenerateResource.Cache
?????文件????????2210??2018-12-26?20:11??Calculator\Calculator\obj\Debug\Calculator.csprojResolveAssemblyReference.cache
?????文件???????17408??2018-12-27?11:54??Calculator\Calculator\obj\Debug\Calculator.exe
?????文件?????????180??2018-12-26?21:51??Calculator\Calculator\obj\Debug\Calculator.Form1.resources
?????文件???????30208??2018-12-27?11:54??Calculator\Calculator\obj\Debug\Calculator.pdb
?????文件?????????180??2018-12-26?20:11??Calculator\Calculator\obj\Debug\Calculator.Properties.Resources.resources
?????文件????????1452??2018-12-26?16:00??Calculator\Calculator\obj\Debug\DesignTimeResolveAssemblyReferences.cache
?????文件????????6905??2018-12-19?11:30??Calculator\Calculator\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
?????目錄???????????0??2018-12-19?11:29??Calculator\Calculator\obj\Debug\TempPE\
?????文件?????????491??2018-12-19?11:29??Calculator\Calculator\Program.cs
?????目錄???????????0??2018-12-27?15:08??Calculator\Calculator\Properties\
............此處省略5個(gè)文件信息