VB.net 電卓計算

Question

VB.netにて電卓作成をしているのですが、３つ追加したい機能があります。
→ ± 小数点の計算です

小数点の計算につきましては表示はできているのですが、＋ － ＊ /の機能に処理を書いていません
。

どう書いたらいいのか分からないので、分かる方いましたらお願いします。

Public Class Form2
'変数宣言
Private mode As String
Private taihi As String
Private cmd As String
Private hozon As String
Private Sub xyz()

    If taihi = "" Then
        Return


    End If


    Dim a As Integer = Integer.Parse(taihi)
    Dim b As Integer = Integer.Parse(TextBox1.Text)



    If hozon = "" Then
        hozon = TextBox1.Text
    Else
        b = Integer.Parse(TextBox1.Text)
    End If

    Select Case mode
        Case "+"
            Dim intTotal As Integer = a + b
            TextBox1.Text = intTotal.ToString()
        Case "-"
            Dim inthiku As Integer = a - b
            TextBox1.Text = inthiku.ToString()

        Case "*"
            Dim intkakeru As Integer = a * b
            TextBox1.Text = intkakeru.ToString()
        Case "/"
            Dim intwaru As Integer = a \ b
            TextBox1.Text = intwaru.ToString()
    End Select

End Sub

Private Sub Keisan(Tasu As String)

    Select Case cmd
        Case "+", "-", "/", "*"
            TextBox1.Text = Tasu.ToString()

            cmd = ""
        Case Else
            If TextBox1.Text = "0" Then
                TextBox1.Text = Tasu.ToString()
            Else
                TextBox1.Text &= Tasu.ToString()

            End If
    End Select

End Sub
Private Sub BtnOne_Click(sender As Object, e As EventArgs) Handles btn1.Click

    Keisan("1")






End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles btn2.Click
    Keisan("2")

End Sub
'１～9のメソッド呼び出し
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles btn3.Click
    Keisan("3")
End Sub

Private Sub Button4_Click(sender As Object, e As EventArgs) Handles btn4.Click
    Keisan("4")
End Sub

Private Sub Button5_Click(sender As Object, e As EventArgs) Handles btn5.Click

    Keisan("5")
End Sub

Private Sub btn6_Click(sender As Object, e As EventArgs) Handles btn6.Click

    Keisan("6")
End Sub

Private Sub btn7_Click(sender As Object, e As EventArgs) Handles btn7.Click

    Keisan("7")
End Sub
Private Sub btn8_Click(sender As Object, e As EventArgs) Handles btn8.Click
    Keisan("8")
End Sub
Private Sub btn9_Click(sender As Object, e As EventArgs) Handles btn9.Click
    Keisan("9")
End Sub
Private Sub btn0_Click(sender As Object, e As EventArgs) Handles btn0.Click
    Keisan("0")
End Sub





Private Sub btn00_Click(sender As Object, e As EventArgs) Handles btn00.Click
    Keisan("00")
End Sub

Private Sub Form2_Load(sender As Object, e As EventArgs) Handles Me.Load
    TextBox1.Text = "0"
    mode = ""
    cmd = ""
    taihi = ""
End Sub

Private Sub btnDel_Click(sender As Object, e As EventArgs) Handles btnDel.Click
    If TextBox1.Text >= "0" And Text <= "9" Then

    End If
    If TextBox1.Text = "C" Then
    End If
End Sub
'足し算の処理
Private Sub ButtonPlus_Click(sender As Object, e As EventArgs) Handles ButtonPlus.Click

    xyz()

    taihi = TextBox1.Text
    hozon = TextBox1.Text


    If TextBox1.Text = "0" Then
        taihi = TextBox1.Text


        TextBox1.Text = taihi
    Else

        hozon = TextBox1.Text

    End If


    cmd = "+"
    mode = "+"

End Sub

Private Function Geta() As Integer
    Throw New NotImplementedException()
End Function

Private Function d() As Object
    Throw New NotImplementedException()
End Function

Private Function Getope() As String

End Function
'少数の処理
Private Sub btnPoint_Click(sender As Object, e As EventArgs) Handles btnPoint.Click
    TextBox1.Text = $"{TextBox1.Text}."

End Sub
'クリア
Private Sub ButtonCancel_Click(sender As Object, e As EventArgs) Handles ButtonCancel.Click
    mode = ""
    cmd = ""
    hozon = ""
    taihi = ""
    TextBox1.Text = "0"

End Sub
'引き算の処理
Private Sub ButtonMinus_Click(sender As Object, e As EventArgs) Handles ButtonMinus.Click
    xyz()
    taihi = TextBox1.Text

    cmd = "-"
    mode = "-"
End Sub
'イコール
Private Sub ButtonEqual_Click(sender As Object, e As EventArgs) Handles ButtonEqual.Click


    xyz()

End Sub

Private Sub Form2_HandleDestroyed(sender As Object, e As EventArgs) Handles Me.HandleDestroyed

End Sub
'割り算
Private Sub ButtonDiv_Click(sender As Object, e As EventArgs) Handles ButtonDiv.Click
    xyz()
    taihi = TextBox1.Text
    cmd = "/"
    mode = "/"
End Sub
'掛け算
Private Sub ButtonMul_Click(sender As Object, e As EventArgs) Handles ButtonMul.Click
    xyz()
    taihi = TextBox1.Text
    cmd = "*"
    mode = "*"
End Sub

Private Sub ButtonSign_Click(sender As Object, e As EventArgs) Handles ButtonSign.Click

End Sub

End Class

Answer 1

Integerが整数の定義なので小数点に対応しないと思います。

Double型などを用いて少数に対応させれば計算できるとおもいますよ。

ちなみにコードについては以下の</>ってなっているボタンを押すか「```」で囲んでください。そのようにすることで、コードを見やすくすることができます。

 Private mode As String
 Private taihi As String
 Private cmd As String