Public Class 計算機
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        計算前_tb.Enabled = False : 計算後_tb.Enabled = False : 計算式_tb.Enabled = False
        Me.KeyPreview = True
    End Sub
    Private Sub Form_KeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown
        Select Case e.KeyCode
            Case Keys.NumPad1 : 一_bt.PerformClick() : Case Keys.NumPad2 : 二_bt.PerformClick() : Case Keys.NumPad3 : 三_bt.PerformClick() : Case Keys.NumPad4 : 四_bt.PerformClick()
            Case Keys.NumPad5 : 五_bt.PerformClick() : Case Keys.NumPad6 : 六_bt.PerformClick() : Case Keys.NumPad7 : 七_bt.PerformClick() : Case Keys.NumPad8 : 八_bt.PerformClick()
            Case Keys.NumPad9 : 九_bt.PerformClick() : Case Keys.NumPad0 : 零_bt.PerformClick() : Case Keys.Decimal : 小數點_bt.PerformClick() : Case Keys.D1 : 一_bt.PerformClick()
            Case Keys.D2 : 二_bt.PerformClick() : Case Keys.D3 : 三_bt.PerformClick() : Case Keys.D4 : 四_bt.PerformClick() : Case Keys.D5 : 五_bt.PerformClick()
            Case Keys.D6 : 六_bt.PerformClick() : Case Keys.D7 : 七_bt.PerformClick() : Case Keys.D8 : 八_bt.PerformClick() : Case Keys.D9 : 九_bt.PerformClick()
            Case Keys.D0 : 零_bt.PerformClick() : Case Keys.OemPeriod : 小數點_bt.PerformClick() : Case Keys.Delete : 消除_bt.PerformClick() : Case Keys.Multiply : 乘_bt.PerformClick()
            Case Keys.Subtract : 減_bt.PerformClick() : Case Keys.OemMinus : 減_bt.PerformClick() : Case Keys.Add : 加_bt.PerformClick() : Case Keys.Oemplus : 加_bt.PerformClick()
            Case Keys.Oem2 : 除_bt.PerformClick() : Case Keys.Divide : 除_bt.PerformClick()
        End Select
    End Sub
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles 一_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 1
        Else
            計算前_tb.Text = 1
        End If
    End Sub
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles 二_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 2
        Else
            計算前_tb.Text = 2
        End If
    End Sub
    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles 三_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 3
        Else
            計算前_tb.Text = 3
        End If
    End Sub
    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles 四_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 4
        Else
            計算前_tb.Text = 4
        End If
    End Sub
    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles 五_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 5
        Else
            計算前_tb.Text = 5
        End If
    End Sub
    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles 六_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 6
        Else
            計算前_tb.Text = 6
        End If
    End Sub
    Private Sub Button7_Click(sender As Object, e As EventArgs) Handles 七_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 7
        Else
            計算前_tb.Text = 7
        End If
    End Sub
    Private Sub Button8_Click(sender As Object, e As EventArgs) Handles 八_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 8
        Else
            計算前_tb.Text = 8
        End If
    End Sub
    Private Sub Button9_Click(sender As Object, e As EventArgs) Handles 九_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 9
        Else
            計算前_tb.Text = 9
        End If
    End Sub
    Private Sub Button10_Click(sender As Object, e As EventArgs) Handles 零_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & 0
        Else
            計算前_tb.Text = 0
        End If
    End Sub
    Private Sub Button12_Click(sender As Object, e As EventArgs) Handles 小數點_bt.Click
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = 計算前_tb.Text & "."
        Else
            計算前_tb.Text = "0."
        End If
    End Sub
    '----------------------------數字鍵盤---------------------------------------------------------------------------------------------------------------
    Private Sub Button11_Click(sender As Object, e As EventArgs) Handles 消除_bt.Click
        Dim SS As Integer
        If 計算前_tb.Text <> "" Then
            計算前_tb.Text = Int(Val(計算前_tb.Text) / 10)
        ElseIf 計算前_tb.Text = "" And 計算後_tb.Text <> "" Then
            SS = Len(計算後_tb.Text)
            計算後_tb.Text = Strings.Left(計算後_tb.Text, SS - 1)
        Else
            計算前_tb.Text = ""
        End If

    End Sub
    Private Sub Button16_Click(sender As Object, e As EventArgs) Handles 除_bt.Click
        等於_bt.PerformClick()
        If 計算前_tb.Text <> "" And 計算後_tb.Text = "" Then
            計算後_tb.Text = 計算前_tb.Text
            計算前_tb.Text = ""
        End If
        If 計算前_tb.Text <> "" And 計算後_tb.Text <> "" Then
            計算後_tb.Text = Val(計算後_tb.Text) / Val(計算前_tb.Text)
            計算前_tb.Text = ""
        End If
        計算式_tb.Text = "/"
    End Sub

    Private Sub Button15_Click(sender As Object, e As EventArgs) Handles 乘_bt.Click
        等於_bt.PerformClick()
        If 計算前_tb.Text <> "" And 計算後_tb.Text = "" Then
            計算後_tb.Text = 計算前_tb.Text
            計算前_tb.Text = ""
        End If
        If 計算前_tb.Text <> "" And 計算後_tb.Text <> "" Then
            計算後_tb.Text = Val(計算前_tb.Text) * Val(計算後_tb.Text)
            計算前_tb.Text = ""
        End If
        計算式_tb.Text = "X"
    End Sub
    Private Sub Button13_Click(sender As Object, e As EventArgs) Handles 加_bt.Click
        等於_bt.PerformClick()
        If 計算前_tb.Text <> "" And 計算後_tb.Text = "" Then
            計算後_tb.Text = 計算前_tb.Text
            計算前_tb.Text = ""
        End If
        If 計算前_tb.Text <> "" And 計算後_tb.Text <> "" Then
            計算後_tb.Text = Val(計算前_tb.Text) + Val(計算後_tb.Text)
            計算前_tb.Text = ""
        End If
        計算式_tb.Text = "+"
    End Sub
    Private Sub Button14_Click(sender As Object, e As EventArgs) Handles 減_bt.Click
        等於_bt.PerformClick()
        If 計算前_tb.Text <> "" And 計算後_tb.Text = "" Then
            計算後_tb.Text = 計算前_tb.Text
            計算前_tb.Text = ""
        End If
        If 計算前_tb.Text <> "" And 計算後_tb.Text <> "" Then
            計算後_tb.Text = Val(計算後_tb.Text) - Val(計算前_tb.Text)
            計算前_tb.Text = ""
        End If
        計算式_tb.Text = "-"
    End Sub
    Private Sub Button17_Click(sender As Object, e As EventArgs) Handles 清空_bt.Click
        計算前_tb.Text = "" : 計算後_tb.Text = "" : 計算式_tb.Text = "" : 答案_tb.Text = ""
    End Sub
    Private Sub TextBox2_TextChanged(sender As Object, e As EventArgs) Handles 計算後_tb.TextChanged
        答案_tb.Text = 計算後_tb.Text
        If 計算後_tb.Text = "" Then : Else
            If 計算後_tb.Text - Int(計算後_tb.Text) <> 0 Then
                答案_tb.Text = Format(Val(答案_tb.Text), "#,##0.0000")
            Else
                答案_tb.Text = Format(Val(答案_tb.Text), "#,##0")
            End If
        End If
        If Val(計算後_tb.Text) > 9.99973000350998E+85 Then
            MsgBox("EFFORT错误！结果过大请点击AC重新启动!!!")
        End If
    End Sub
    Private Sub Button18_Click(sender As Object, e As EventArgs) Handles 等於_bt.Click
        If 計算前_tb.Text <> "" And 計算後_tb.Text <> "" Then
            If 計算式_tb.Text = "X" Then
                計算後_tb.Text = Val(計算前_tb.Text) * Val(計算後_tb.Text) : 計算前_tb.Text = ""
            End If
            If 計算式_tb.Text = "/" Then
                計算後_tb.Text = Val(計算後_tb.Text) / Val(計算前_tb.Text) : 計算前_tb.Text = ""
            End If
            If 計算式_tb.Text = "+" Then
                計算後_tb.Text = Val(計算前_tb.Text) + Val(計算後_tb.Text) : 計算前_tb.Text = ""
            End If
            If 計算式_tb.Text = "-" Then
                計算後_tb.Text = Val(計算後_tb.Text) - Val(計算前_tb.Text) : 計算前_tb.Text = ""
            End If
        Else
        End If
    End Sub
End Class