Napisałam prosty kalkulator w microsoft visual basic. Niestety nie znam funkcji bo tworzyłam go juz z gotowego tutoriala:( proszę o pomoc w nazwach poszczególnych funkcji oto kod. Dodatkowo w załączniku zamieszczam mój kalkulator. Niestety mam też problem w tym, że nie czyta on podwójnych znaków, nie działa przecinek i dzieli przez zero :( nie wiem w czym błąd. Proszę o pomoc

[Public Class Form1
Dim operat As String
Dim Cyfra_Pierwsza As Boolean = True
Dim walor1, walor2 As Double

Private Sub operat_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles _
Button13.Click, Button14.Click, Button15.Click, Button16.Click
walor1 = Double.Parse(TextBox1.Text)
operat = CType(sender, Button).Text
Cyfra_Pierwsza = True
End Sub

Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
Dim rezultat As Double
walor2 = Double.Parse(TextBox1.Text)
If operat = "/" Then
rezultat = walor1 / walor2
ElseIf operat = "*" Then
rezultat = walor1 * walor2
ElseIf operat = "-" Then
rezultat = walor1 - walor2
ElseIf operat = "+" Then
rezultat = walor1 + walor2
End If
TextBox1.Text = rezultat.ToString
walor1 = rezultat
Cyfra_Pierwsza = True
End Sub

Private Sub Button17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.Click
TextBox1.Text = "0"
operat = ""
Cyfra_Pierwsza = True
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
TextBox1.Text = "1"

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
TextBox1.Text = "2"
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
TextBox1.Text = "3"
End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
TextBox1.Text = "4"
End Sub

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
TextBox1.Text = "5"
End Sub

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
TextBox1.Text = "6"
End Sub

Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
TextBox1.Text = "7"
End Sub

Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
TextBox1.Text = "8"
End Sub

Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
TextBox1.Text = "9"
End Sub

Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
TextBox1.Text = "0"
End Sub

Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click
TextBox1.Text = "."
End Sub
End Class][/code]