I am writing a calculator WinForm in VB. I have a label used to display the output "Result". My problem comes when trying to add a "." to my label string. Example: I will type 355.5 and until the 5 is pressed after it, my string is showing up as .355 After the last 5 is pressed, it jumps into the correct location. I have exhausted my debugging skill and now am just going crazy. Anyone encounter this before?
Here's my entire code so far (ignore unfinished functions)
Public Class MyCalc
Private bDecFlag As Boolean
Private sMathOp As String
Private Sub ModeSel_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ModeSel.SelectedIndexChanged
If ModeSel.SelectedIndex = 3 Then
Me.Width = 360
ElseIf ModeSel.SelectedIndex > 2 Then
Me.Width = 590
Else
Me.Width = 250
End If
If ModeSel.SelectedIndex = 0 Then
For iCount As Integer = 0 To 9
Me.Controls("Digit" & iCount).Enabled = True
Next
End If
If ModeSel.SelectedIndex = 1 Then
For iCount As Integer = 2 To 9
Me.Controls("Digit" & iCount).Enabled = False
Next
End If
If ModeSel.SelectedIndex = 2 Then
For iCount As Integer = 0 To 7
Me.Controls("Digit" & iCount).Enabled = True
Next
Digit8.Enabled = False
Digit9.Enabled = False
End If
If ModeSel.SelectedIndex = 3 Then
For iCount As Integer = 0 To 9
Me.Controls("Digit" & iCount).Enabled = True
Next
For iCount As Integer = Asc("A") To Asc("F")
Me.Controls("Alpha" & Chr(iCount)).Enabled = True
Next
For iCount As Integer = Asc("G") To Asc("Z")
Me.Controls("Alpha" & Chr(iCount)).Enabled = False
Next
End If
If ModeSel.SelectedIndex = 4 Then
For iCount As Integer = 0 To 9
Me.Controls("Digit" & iCount).Enabled = True
Next
For iCount As Integer = Asc("A") To Asc("Z")
Me.Controls("Alpha" & Chr(iCount)).Enabled = True
Next
AlphaA.Enabled = False
AlphaE.Enabled = False
AlphaI.Enabled = False
AlphaO.Enabled = False
AlphaU.Enabled = False
End If
End Sub
Private Sub Digit0_Click(sender As System.Object, e As System.EventArgs) Handles Digit0.Click
UpdateResult(0)
End Sub
Private Sub Digit1_Click(sender As System.Object, e As System.EventArgs) Handles Digit1.Click
UpdateResult(1)
End Sub
Private Sub Digit2_Click(sender As System.Object, e As System.EventArgs) Handles Digit2.Click
UpdateResult(2)
End Sub
Private Sub Digit3_Click(sender As System.Object, e As System.EventArgs) Handles Digit3.Click
UpdateResult(3)
End Sub
Private Sub Digit4_Click(sender As System.Object, e As System.EventArgs) Handles Digit4.Click
UpdateResult(4)
End Sub
Private Sub Digit5_Click(sender As System.Object, e As System.EventArgs) Handles Digit5.Click
UpdateResult(5)
End Sub
Private Sub Digit6_Click(sender As System.Object, e As System.EventArgs) Handles Digit6.Click
UpdateResult(6)
End Sub
Private Sub Digit7_Click(sender As System.Object, e As System.EventArgs) Handles Digit7.Click
UpdateResult(7)
End Sub
Private Sub Digit8_Click(sender As System.Object, e As System.EventArgs) Handles Digit8.Click
UpdateResult(8)
End Sub
Private Sub Digit9_Click(sender As System.Object, e As System.EventArgs) Handles Digit9.Click
UpdateResult(9)
End Sub
Private Sub DecBut_Click(sender As System.Object, e As System.EventArgs) Handles DecBut.Click
If bDecFlag = False Then
If Result.Text = "0" Then
Result.Text = "0."
bDecFlag = True
Else
Result.Text = Result.Text + "."
bDecFlag = True
End If
End If
End Sub
Private Sub ClrBut_Click(sender As System.Object, e As System.EventArgs) Handles ClrBut.Click
Result.Text = 0
bDecFlag = False
End Sub
Private Sub DelBut_Click(sender As System.Object, e As System.EventArgs) Handles DelBut.Click
If Result.Text = "0" Then
ElseIf Result.Text.Substring(Result.Text.Length - 1) = "." Then
Result.Text = Result.Text.Substring(0, Result.Text.Length - 1)
bDecFlag = False
Else
Result.Text = Result.Text.Substring(0, Result.Text.Length - 1)
If Result.Text = "" Then
Result.Text = "0"
End If
End If
End Sub
Private Sub MyCalc_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
Select Case e.KeyCode
Case Keys.NumPad0
Digit0_Click(Digit0, New EventArgs)
Case Keys.NumPad1
Digit1_Click(Digit1, New EventArgs)
Case Keys.NumPad2
Digit2_Click(Digit2, New EventArgs)
Case Keys.NumPad3
Digit3_Click(Digit3, New EventArgs)
Case Keys.NumPad4
Digit4_Click(Digit4, New EventArgs)
Case Keys.NumPad5
Digit5_Click(Digit5, New EventArgs)
Case Keys.NumPad6
Digit6_Click(Digit6, New EventArgs)
Case Keys.NumPad7
Digit7_Click(Digit7, New EventArgs)
Case Keys.NumPad8
Digit8_Click(Digit8, New EventArgs)
Case Keys.NumPad9
Digit9_Click(Digit9, New EventArgs)
Case Keys.Back
DelBut_Click(DelBut, New EventArgs)
Case Keys.Decimal
DecBut_Click(DecBut, New EventArgs)
End Select
End Sub
Private Sub MyCalc_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
bDecFlag = False
End Sub
Public Sub UpdateResult(ByVal sNum As String)
If Result.Text = "0" Then
Result.Text = sNum
Else
Result.Text &= sNum
End If
End Sub
End Class
So after the long debugging, I found out that you are using the Label/Textbox RightToLeft property set to yes . Nothing is wrong with it really, but it can't handle special characters including decimal points, commas, etc. properly. The workaround for this is to reverse what we have expected - to reverse the string concatenation.
Result.Text = "." & Result.Text
Not seeing entire code I'm not exactly sure but I think there might be something wrong with string concatenation.
Try changing into this:
Result.Text = Result.Text & "."
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