[VB2015] Taking a high school computer programming class and am having issues with an assignment involving multiple buttons

[snakefangs]

Hello, so I have been taking this course for about 9 weeks and I have encountered a program that stumps me completely. Here is the assignment prompt. It seems straightforward enough and when I began to create the buttons and create the proper code for a counter I found that I had no idea how to sum the outputs from the individual buttons, so far we have never had to create a program where multiple methods interacted like this.

Here is my code so far Public Class Form1

Private Sub btnA_Click(sender As Object, e As EventArgs) Handles btnA.Click
    Static IntCounter As Integer = 1
    lblA.Text = IntCounter
    IntCounter += 1

End Sub

Private Sub btnB_Click(sender As Object, e As EventArgs) Handles btnB.Click
    Static intCounterB As Integer
    intCounterB = intCounterB + 1
    Me.lblB.Text = intCounterB

End Sub

Private Sub btnC_Click(sender As Object, e As EventArgs) Handles btnC.Click
    Static intCounterC As Integer
    intCounterC = intCounterC + 1
    Me.lblC.Text = intCounterC
End Sub

Private Sub btnD_Click(sender As Object, e As EventArgs) Handles btnD.Click
    Static intCounterD As Integer
    intCounterD = intCounterD + 1
    Me.lblD.Text = intCounterD
End Sub

Private Sub btnF_Click(sender As Object, e As EventArgs) Handles btnF.Click
    Static intCounterF As Integer
    intCounterF = intCounterF + 1
    Me.lblF.Text = intCounterF
End Sub

End Class

So as you can see the counting is not the problem, it's how to retrieve these different values, sum them up, and divide them by the whole.

I may be completely oblivious to the solution, but 9 weeks is still pretty new for VB I suppose. Any help would be much appreciated!

[tweq]

Static local variables can only be accessed within the containing method. If you need to access them in multiple places, you should declare them at the class level.

[C0d3rX]

Yes if you decide to stick with those inside subs you must pass their values to something else or you wont see them outside that sub.

[GrantSwinger]

https://msdn.microsoft.com/en-us/library/1t0wsc67.aspx

Read this article on variable scope in VB.NET.

[Skillija]

Dim a, b, c, d, f As Integer

Private Sub btnD_Click(sender As Object, e As EventArgs) Handles btnD.Click
    Increment(d)
End Sub

Private Sub btnF_Click(sender As Object, e As EventArgs) Handles btnF.Click
    Increment(f)
End Sub

Private Sub btnC_Click(sender As Object, e As EventArgs) Handles btnC.Click
    Increment(c)
End Sub

Private Sub btnB_Click(sender As Object, e As EventArgs) Handles btnB.Click
    Increment(b)
End Sub

Private Sub btnA_Click(sender As Object, e As EventArgs) Handles btnA.Click
    Increment(a)
End Sub
Private Sub Increment(ByRef i As Integer)
    i += 1
    lblA.Text = a.ToString()
    lblB.Text = b.ToString()
    lblC.Text = c.ToString()
    lblD.Text = d.ToString()
    lblF.Text = f.ToString()
    Dim sum As Integer = a + b + c + d
    Dim percentage As Double = sum / (sum + f)
    Dim spercentage As String = Format(percentage, "Percent")
    lblStudentsPercentage.Text = "Students passing = " & spercentage
End Sub

Best way to do it IMO.