Public Class SimpleCalculator
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Inherits System.Windows.Forms.Form
#Region " Windows 窗體設(shè)計(jì)器生成的代碼 "
Public Sub New()
MyBase.New()
'該調(diào)用是 Windows 窗體設(shè)計(jì)器所必需的。
InitializeComponent()
'在 InitializeComponent() 調(diào)用之后添加任何初始化
End Sub
'窗體重寫處置以清理組件列表。
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Windows 窗體設(shè)計(jì)器所必需的
Private components As System.ComponentModel.IContainer
'注意：以下過程是 Windows 窗體設(shè)計(jì)器所必需的
'可以使用 Windows 窗體設(shè)計(jì)器修改此過程。
'不要使用代碼編輯器修改它。
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents Button3 As System.Windows.Forms.Button
Friend WithEvents Button4 As System.Windows.Forms.Button
Friend WithEvents Button5 As System.Windows.Forms.Button
Friend WithEvents Button6 As System.Windows.Forms.Button
Friend WithEvents Button7 As System.Windows.Forms.Button
Friend WithEvents Button8 As System.Windows.Forms.Button
Friend WithEvents Button9 As System.Windows.Forms.Button
Friend WithEvents Button10 As System.Windows.Forms.Button
Friend WithEvents Button11 As System.Windows.Forms.Button
Friend WithEvents Button12 As System.Windows.Forms.Button
Friend WithEvents Button13 As System.Windows.Forms.Button
Friend WithEvents Button14 As System.Windows.Forms.Button
Friend WithEvents Button15 As System.Windows.Forms.Button
Friend WithEvents Button16 As System.Windows.Forms.Button
System.Diagnostics.DebuggerStepThrough() Private Sub InitializeComponent()
Me.Label1 = New System.Windows.Forms.Label
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Button3 = New System.Windows.Forms.Button
Me.Button4 = New System.Windows.Forms.Button
Me.Button5 = New System.Windows.Forms.Button
Me.Button6 = New System.Windows.Forms.Button
Me.Button7 = New System.Windows.Forms.Button
Me.Button8 = New System.Windows.Forms.Button
Me.Button9 = New System.Windows.Forms.Button
Me.Button10 = New System.Windows.Forms.Button
Me.Button11 = New System.Windows.Forms.Button
Me.Button12 = New System.Windows.Forms.Button
Me.Button13 = New System.Windows.Forms.Button
Me.Button14 = New System.Windows.Forms.Button
Me.Button15 = New System.Windows.Forms.Button
Me.Button16 = New System.Windows.Forms.Button
Me.SuspendLayout()
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(16, 16)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(48, 16)
Me.Label1.TabIndex = 0
Me.Label1.Text = "結(jié)果："
'
'TextBox1
'
Me.TextBox1.Location = New System.Drawing.Point(64, 8)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(120, 21)
Me.TextBox1.TabIndex = 1
Me.TextBox1.Text = ""
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(200, 8)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(56, 24)
Me.Button1.TabIndex = 2
Me.Button1.Text = "清空"
'
'Button2
'
Me.Button2.Location = New System.Drawing.Point(48, 56)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(24, 24)
Me.Button2.TabIndex = 3
Me.Button2.Text = "1"
'
'Button3
'
Me.Button3.Location = New System.Drawing.Point(88, 56)
Me.Button3.Name = "Button3"
Me.Button3.Size = New System.Drawing.Size(24, 24)
Me.Button3.TabIndex = 4
Me.Button3.Text = "2"
'
'Button4
'
Me.Button4.Location = New System.Drawing.Point(136, 56)
Me.Button4.Name = "Button4"
Me.Button4.Size = New System.Drawing.Size(24, 24)
Me.Button4.TabIndex = 5
Me.Button4.Text = "3"
'
'Button5
'
Me.Button5.Location = New System.Drawing.Point(48, 88)
Me.Button5.Name = "Button5"
Me.Button5.Size = New System.Drawing.Size(24, 24)
Me.Button5.TabIndex = 6
Me.Button5.Text = "4"
'
'Button6
'
Me.Button6.Location = New System.Drawing.Point(88, 88)
Me.Button6.Name = "Button6"
Me.Button6.Size = New System.Drawing.Size(24, 24)
Me.Button6.TabIndex = 7
Me.Button6.Text = "5"
'
'Button7
'
Me.Button7.Location = New System.Drawing.Point(136, 88)
Me.Button7.Name = "Button7"
Me.Button7.Size = New System.Drawing.Size(24, 24)
Me.Button7.TabIndex = 8
Me.Button7.Text = "6"
'
'Button8
'
Me.Button8.Location = New System.Drawing.Point(48, 120)
Me.Button8.Name = "Button8"
Me.Button8.Size = New System.Drawing.Size(24, 24)
Me.Button8.TabIndex = 9
Me.Button8.Text = "7"
'
'Button9
'
Me.Button9.Location = New System.Drawing.Point(88, 120)
Me.Button9.Name = "Button9"
Me.Button9.Size = New System.Drawing.Size(24, 24)
Me.Button9.TabIndex = 10
Me.Button9.Text = "8"
'
'Button10
'
Me.Button10.Location = New System.Drawing.Point(136, 120)
Me.Button10.Name = "Button10"
Me.Button10.Size = New System.Drawing.Size(24, 24)
Me.Button10.TabIndex = 11
Me.Button10.Text = "9"
'
'Button11
'
Me.Button11.Location = New System.Drawing.Point(48, 152)
Me.Button11.Name = "Button11"
Me.Button11.Size = New System.Drawing.Size(24, 24)
Me.Button11.TabIndex = 12
Me.Button11.Text = "0"
'
'Button12
'
Me.Button12.Location = New System.Drawing.Point(176, 56)
Me.Button12.Name = "Button12"
Me.Button12.Size = New System.Drawing.Size(24, 24)
Me.Button12.TabIndex = 13
Me.Button12.Text = "+"
'
'Button13
'
Me.Button13.Location = New System.Drawing.Point(176, 88)
Me.Button13.Name = "Button13"
Me.Button13.Size = New System.Drawing.Size(24, 24)
Me.Button13.TabIndex = 14
Me.Button13.Text = "-"
'
'Button14
'
Me.Button14.Location = New System.Drawing.Point(176, 120)
Me.Button14.Name = "Button14"
Me.Button14.Size = New System.Drawing.Size(24, 24)
Me.Button14.TabIndex = 15
Me.Button14.Text = "*"
'
'Button15
'
Me.Button15.Location = New System.Drawing.Point(176, 152)
Me.Button15.Name = "Button15"
Me.Button15.Size = New System.Drawing.Size(24, 24)
Me.Button15.TabIndex = 16
Me.Button15.Text = "/"
'
'Button16
'
Me.Button16.Location = New System.Drawing.Point(88, 152)
Me.Button16.Name = "Button16"
Me.Button16.Size = New System.Drawing.Size(72, 24)
Me.Button16.TabIndex = 17
Me.Button16.Text = "計(jì)算"
'
'SimpleCalculator
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(264, 190)
Me.Controls.Add(Me.Button16)
Me.Controls.Add(Me.Button15)
Me.Controls.Add(Me.Button14)
Me.Controls.Add(Me.Button13)
Me.Controls.Add(Me.Button12)
Me.Controls.Add(Me.Button11)
Me.Controls.Add(Me.Button10)
Me.Controls.Add(Me.Button9)
Me.Controls.Add(Me.Button8)
Me.Controls.Add(Me.Button7)
Me.Controls.Add(Me.Button6)
Me.Controls.Add(Me.Button5)
Me.Controls.Add(Me.Button4)
Me.Controls.Add(Me.Button3)
Me.Controls.Add(Me.Button2)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Label1)
Me.Name = "SimpleCalculator"
Me.Text = "簡單計(jì)算器"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
Private Sub TextBox1_TabStopChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim btn As Button '按鈕類型的變量
btn = sender '把產(chǎn)生該事件的按鈕對象賦值給btn
TextBox1.Text = TextBox1.Text + btn.Text '把該按鈕的Text屬性值連接到TextBox1中
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click
Dim btn As Button
btn = sender
TextBox1.Text += btn.Text
End Sub
Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
Dim btn As Button
btn = sender
'在文本框的Text屬性后連接一個(gè)空格、本按鈕的Text屬性值和一個(gè)空格
TextBox1.Text = TextBox1.Text + " " + btn.Text + " "
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
TextBox1.Text = "" '清空文本框
End Sub
Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click
Dim btn As Button
btn = sender
TextBox1.Text = TextBox1.Text + " " + btn.Text + " "
End Sub
Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click
Dim btn As Button
btn = sender
TextBox1.Text = TextBox1.Text + " " + btn.Text + " "
End Sub
Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
Dim btn As Button
btn = sender
TextBox1.Text = TextBox1.Text + " " + btn.Text + " "
End Sub
Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click
'發(fā)生錯(cuò)誤轉(zhuǎn)移到標(biāo)號“ErrorPro”指定的行去執(zhí)行錯(cuò)誤處理程序
On Error GoTo ErrorPro
Dim r As Decimal '保存計(jì)算結(jié)果的變量
Dim t As String = TextBox1.Text '用于保存文本框中的算術(shù)表達(dá)式
Dim space As Integer = t.IndexOf(" ") '搜索空格位置,如果沒有空格，返回值為0
'字符串的取子符方法，第二個(gè)參數(shù)小于0，則將產(chǎn)生錯(cuò)誤號為5的異常，即過程參數(shù)不正確
Dim s1 As String = t.Substring(0, space) '通過取子串方法獲得第一個(gè)運(yùn)算數(shù)
Dim op As String = t.Substring(space + 1, 1) '通過取子串方法獲得運(yùn)算符
Dim s2 As String = t.Substring(space + 3) '通過取子串方法獲得第二個(gè)運(yùn)算數(shù)
Dim arg1, arg2 As Integer
arg1 = Val(s1) : arg2 = Val(s2)
Select Case op
Case "+" : r = arg1 + arg2
Case "-" : r = arg1 - arg2
Case "*" : r = arg1 * arg2
Case "/" : r = arg1 / arg2
Case Else
MsgBox("輸入的運(yùn)算符有誤！")
Exit Sub
End Select
TextBox1.Text = CStr(r) '顯示結(jié)果
Exit Sub '退出過程
ErrorPro: '錯(cuò)誤處理程序塊
Select Case Err.Number
Case 6 '除數(shù)為零時(shí)，或運(yùn)算溢出時(shí)的錯(cuò)誤號
MsgBox("算術(shù)運(yùn)算溢出！", , "溢出提示")
TextBox1.Focus()
Exit Sub
Case 5 ' Substring過程的參數(shù)不符合要求的錯(cuò)誤號
MsgBox("必須輸入運(yùn)算符和第二個(gè)運(yùn)算數(shù)！", , "運(yùn)算數(shù)少")
Exit Sub
Case Else
'其它情況顯示錯(cuò)誤號和錯(cuò)誤原因
MsgBox("錯(cuò)誤號為" Err.Number Chr(10) Chr(13) "錯(cuò)誤原因：" Err.Description)
Exit Sub
End Select
End Sub
End Class
先在form上建立三個(gè)textbox，分別為textbox1,textbox2,textbox3，再建立四個(gè)按鈕，分別為cmdplus,cmdminus,cmdmultiple,cmddivide，代碼如下：
Private Sub cmdplus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdplus.Click
Dim a As Integer
Dim b As Integer
a = TextBox1.Text
b = TextBox2.Text
TextBox3.Text = a + b
End If
Private Sub cmdminus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdminus.Click
Dim a As Integer
Dim b As Integer
a = TextBox1.Text
b = TextBox2.Text
TextBox3.Text = a - b
End If
Private Sub cmdmultiple_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdmultiple.Click
Dim a As Integer
Dim b As Integer
a = TextBox1.Text
b = TextBox2.Text
TextBox3.Text = a * b
End If
Private Sub cmddivide_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmddivide.Click
Dim a As Integer
Dim b As Integer
a = TextBox1.Text
b = TextBox2.Text
TextBox3.Text = a / b
End If
Option?Explicit
Dim?FirstNumber,?NumberBuffer?As?Double'定義數(shù)據(jù)類型
Dim?chr?As?String
Dim?ScaleCodeState?As?Boolean
Dim?ScaleCode?As?Integer
Dim?ScaleSymbol(0?To?7)?As?String?'上面這些DIM都是定義數(shù)據(jù)類型
Private?Sub?Init()'==sub過程，實(shí)際功能就是清零。把label、FirstNumber、等都初始化
Label1.Caption?=?"0"
FirstNumber?=?0
ScaleCode?=?0
ScaleCodeState?=?False
Label2.Caption?=?""
End?Sub????????'==sub過程結(jié)束
Private?Sub?ClearAll_Click()?'點(diǎn)擊ClearAll按鈕
Call?Init'執(zhí)行init過程，就是清零
End?Sub
Private?Sub?Form_Load()'程序啟動
Call?Init'先清零，下面分別賦值加減乘除
ScaleSymbol(0)?=?"+"
ScaleSymbol(1)?=?"-"
ScaleSymbol(2)?=?"*"
ScaleSymbol(3)?=?"/"
End?Sub
Private?Sub?NumberKey_Click(Index?As?Integer)'點(diǎn)擊NumberKey按鈕,NumberKey是數(shù)組控件
chr?=?Val(Index)
If?Left(Label1.Caption,?1)?=?"0"?And?Mid(Label1.Caption,?2,?1)??"."?Then?Label1.Caption?=?Right(Label1.Caption,?Len(Label1.Caption)?-?1)
'如果label1的第一個(gè)字符是0，并且第二個(gè)字符不是.，則label1去掉第一個(gè)0。這個(gè)功能是防止輸入了00.9999這樣的數(shù)，就自動變?yōu)?.9999
If?Len(Label1.Caption)??20?Then?'判斷輸入的數(shù)字長度小于20
If?ScaleCodeState?=?True?Then
ScaleCodeState?=?False
Label1.Caption?=?""
End?If
Label1.Caption?=?Label1.Caption?+?chr
NumberBuffer?=?Val(Label1.Caption)
End?If
End?Sub
Private?Sub?ScaleKey_Click(Index?As?Integer)'點(diǎn)加減乘除
ScaleCode?=?Index
FirstNumber?=?NumberBuffer
ScaleCodeState?=?True
Label2.Caption?=?ScaleSymbol(Index)
Label1.Caption?=?"0"
End?Sub
Private?Sub?Equal_Click()'開始計(jì)算
Select?Case?ScaleCode
Case?0'加
NumberBuffer?=?FirstNumber?+?NumberBuffer
Case?1'減
NumberBuffer?=?FirstNumber?-?NumberBuffer
Case?2'乘
NumberBuffer?=?FirstNumber?*?NumberBuffer
Case?3'除
NumberBuffer?=?FirstNumber?/?NumberBuffer
End?Select
Label1.Caption?=?NumberBuffer'顯示結(jié)果
FirstNumber?=?NumberBuffer
ScaleCodeState?=?True
Label2.Caption?=?""
End?Sub
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