[RESOLVED] Listbox and counter errors...

So my program is suposed to prompt me for 5 integers. these 5 will be added together and produce an average I also need to put a Letter grade, in a label for the average of the 5 numbers.(this idk how to do)
these 5 must be between 0-100 and I'm just lost...i built a program like this before with weight loss but I'm aslo smashed with python can you guys help me out with where some errors are? I'm just crammed and i keep confusing the 2 languages that i'm just now learning.:confused:

Code:

---


'Program Name: Grade Book
'Dev: Bryan Cruse
'Date:11/24/15

Option Strict On




Public Class frmGradeBook
    Dim intGrades As Integer
    Dim IntNumberOFentries As Integer = 1
    Dim StrGrades As String
    Dim decFinalGrades As Decimal
    Dim intMaxNumberOfEntries As Integer = 5
    Dim StrInputMessage As String = "Please enter your grade"
    Dim StrInputHeading As String = "Grade Book"
    Dim StrNormalMessage As String



    Private Sub mnuExitProgramItem_Click(sender As Object, e As EventArgs) Handles mnuExitProgramItem.Click
        Close()
    End Sub

    Private Sub mnuClearGradesItem_Click(sender As Object, e As EventArgs) Handles mnuClearGradesItem.Click
        lstGrades.Items.Clear()

    End Sub

    Private Sub btnEnterGrades_Click(sender As Object, e As EventArgs) Handles btnEnterGrades.Click

        Dim strCancelClicked As String = ""
        StrGrades = InputBox("Please Enter your grades", "Grade Book", )


        Do Until IntNumberOFentries > intMaxNumberOfEntries Or StrGrades = strCancelClicked


         

            If IsNumeric(StrGrades) Then
                intGrades = CInt(Convert.ToDecimal(StrGrades))

                If intGrades > 100 Then
                    MsgBox("Please enter a valid grade.", MsgBoxStyle.Exclamation, "Grade Book")
                    If intGrades > 0 Then
                    Else : MsgBox("You entered a non usable number", , "Input Error")
                    End If
                    lstGrades.Items.Add(intGrades)
                    decFinalGrades += intGrades
                    IntNumberOFentries += 1
                    StrInputMessage = strNormalMessage
                    If IntNumberOFentries >= intMaxNumberOfEntries Then
                        StrGrades = InputBox(StrInputHeading & IntNumberOFentries, StrInputHeading, " ")
                    End If
                End If
            End If
        Loop

        lstGrades.Items.Add(intGrades)

        If IntNumberOFentries <= 5 Then
            lblScore.Visible = True
            decFinalGrades = CDec(intGrades / 7)
            If decFinalGrades <= 68 Then
                lblGrade.Text = "F"
            End If
        End If

            End While


    End Sub
End Class

---

Didn't we answer this question last week?

idk, in two weeks i've destroyed a tb HD and a laptop. so I dont have my other programs to help me remember what to do or any of this one except this hatchet job. I'm re writing now, but I didn't know how to assign a number which would be the final grade to a letter. i imagine it's something simple with ranges and i know exporting it to a label will be easy.

Code:

---

StrNormalMessage = InputBox(StrInputMessage & IntNumberOFentries, StrInputHeading, "")

        Do Until IntNumberOFentries > intMaxNumberOfEntries
            If IsNumeric(StrGrades) Then
                decGrades = Convert.ToDecimal(StrGrades)
                lstGrades.Items.Add(decGrades)
                If decGrades < 0 Then
                    MsgBox("Please enter a positive number", MsgBoxStyle.Critical, "Grade Book")
                    If decGrades >= 100 Then
                        MsgBox("Please enter a correct value", MsgBoxStyle.Exclamation, "Grade Book")
                    End If
                End If

            End If


            If IntNumberOFentries <= intMaxNumberOfEntries Then
                lblScore.Visible = True
                decFinalGrades = decGrades / IntNumberOFentries
                lblScore.Text = decFinalGrades.ToString

            End If
        Loop

---

i have NO idea why this isn't working it's worked like this before. I did use just if and end if instead of else and else in my validation of entered data

i've fixed and there is an error in this

Code:

---

Do Until intMaxNumberOfEntries < 6
            If IsNumeric(StrGrades) Then
                decGrades = Convert.ToDecimal(StrGrades)
                If decGrades < 0 Then
                    lstGrades.Items.Add(StrGrades)
                    decFinalGrades += decGrades
                    StrInputMessage = StrNormalMessage
                Else
                    MsgBox("Please enter a positive number", MsgBoxStyle.Critical, "Grade Book")
                End If
                If decGrades >= 100 Then
                    MsgBox("Please enter a correct value", MsgBoxStyle.Exclamation, "Grade Book")
                End If
            End If
        Loop
        If IntNumberOFentries <= intMaxNumberOfEntries Then
            lblScore.Visible = True
            decFinalGrades = decGrades / intMaxNumberOfEntries
            lblScore.Text = decFinalGrades.ToString

        End If

---

it won't allow only 5 entries. stops me at one.

Do Until intMaxNumberOfEntries < 6

Try Do While...

Code:

---

Do While IntNumberOFentries < 6
    Dim strGrades As String = InputBox("Enter a grade")
    If IsNumeric(strGrades) Then
        decGrades = Convert.ToDecimal(strGrades)
        If decGrades > 0 AndAlso decGrades < 100 Then
            IntNumberOFentries += 1
            lstGrades.Items.Add(strGrades)
            decFinalGrades += decGrades
            StrInputMessage = StrNormalMessage
        ElseIf decGrades <= 0 Then
            MsgBox("Please enter a positive number", MsgBoxStyle.Critical, "Grade Book")
        ElseIf decGrades >= 100 Then
            MsgBox("Please enter a correct value", MsgBoxStyle.Exclamation, "Grade Book")
        End If
    End If
Loop
lblScore.Visible = True
decFinalGrades = decGrades / intMaxNumberOfEntries
lblScore.Text = decFinalGrades.ToString

---

works great, do you know a easy way to find out what range it would fall under like this?A: 92-100, B: 84-91, C: 76-83, D: 68-75, F: Below 68 and it'd be rounded up at .5 i'd need to convert from a decimal to a character right? ughh
Thank you though for the above that helps out very much.

i like my while loops....they do EVERYTHING

Code:

---

Dim gradeLetter as String
Select Case aNumber
    Case < 68
        gradeLetter = "F"
    Case <= 75
        gradeLetter = "D"
    Case <= 83
        gradeLetter = "C"
    Case <= 91
        gradeLetter = "B"
    Case <= 100
        gradeLetter = "A"
End Select

---

that worked, but it's got some kind of bug in there that asks me for a value the first time and then doesnt display it. Also by looking at this does my math logic look correct? This is full code

Code:

---

'Program Name: Grade Book
'Dev: Bryan Cruse
'Date:11/24/15

Option Strict On




Public Class frmGradeBook
    Dim intGrades As Integer
    Dim IntNumberOFentries As Integer = 1
    Dim StrGrades As String
    Dim decFinalGrades As Decimal
    Dim intMaxNumberOfEntries As Integer = 5
    Dim StrInputMessage As String = "Please enter your grade"
    Dim StrInputHeading As String = "Grade Book"
    Dim StrNormalMessage As String
    Dim decGrades As Decimal
    Dim StrLetterGrade As String




    Private Sub mnuExitProgramItem_Click(sender As Object, e As EventArgs) Handles mnuExitProgramItem.Click
        Close()
    End Sub

    Private Sub mnuClearGradesItem_Click(sender As Object, e As EventArgs) Handles mnuClearGradesItem.Click
        lstGrades.Items.Clear()
        lblGrade.Visible = False
        lblScore.Visible = False
        btnEnterGrades.Enabled = True

    End Sub

    Private Sub btnEnterGrades_Click(sender As Object, e As EventArgs) Handles btnEnterGrades.Click
        StrNormalMessage = InputBox(StrInputMessage & IntNumberOFentries, StrInputHeading, "")

       
        Do While IntNumberOFentries < 6
            Dim strGrades As String = InputBox("Enter a grade")
            If IsNumeric(strGrades) Then
                decGrades = Convert.ToDecimal(strGrades)
                If decGrades > 0 AndAlso decGrades < 100 Then
                    IntNumberOFentries += 1
                    lstGrades.Items.Add(strGrades)
                    decFinalGrades += decGrades
                    StrInputMessage = StrNormalMessage
                ElseIf decGrades <= 0 Then
                    MsgBox("Please enter a positive number", MsgBoxStyle.Critical, "Grade Book")
                ElseIf decGrades >= 100 Then
                    MsgBox("Please enter a correct value", MsgBoxStyle.Exclamation, "Grade Book")
                End If
            End If
        Loop
        Dim StrgradeLetter As String
        Select Case decGrades
            Case Is < 68
                StrgradeLetter = "F"
            Case Is <= CDec(66.5)
                StrgradeLetter = "D"
            Case Is <= CDec(75.5)
                StrgradeLetter = "C"
            Case Is <= CDec(83.1)
                StrgradeLetter = "B"
            Case Is <= CDec(91.5)
                StrgradeLetter = "A"
        End Select
        lblScore.Visible = True
        decFinalGrades = decGrades / (intMaxNumberOfEntries - 1)
        lblScore.Text = decFinalGrades.ToString
        lblGrade.Text = StrgradeLetter









    End Sub
End Class

---

Every time you call InputBox it will prompt for input.
You need to look at the Select Case again. Grade D will never be assigned. Also You are probably meant to use Select Case avgGrade (decFinalGrades / 5)

That does work...the input box needs to INSIDE my loops so I'll be prompted everytime. I fixed the math since i have my loop right now. BUT how would i output the select case to a label? I've read everywhere and can't figure it out. It'd be putting that string into lblGrade(and i dont know why i tried lblgrade.text) so Idk how to do it to be honest.

Code:

---

Select Case decGrades
            Case Is < 68
                StrgradeLetter = "F"
            Case Is <= CDec(66.5)
                StrgradeLetter = "D"
            Case Is <= CDec(75.5)
                StrgradeLetter = "C"
            Case Is <= CDec(83.1)
                StrgradeLetter = "B"
            Case Is <= CDec(91.5)
                StrgradeLetter = "A"

---

thats what needs to be in lblGrade, but it can't take strings -.-

Quote:

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Originally Posted by .paul.

Every time you call InputBox it will prompt for input.
You need to look at the Select Case again. Grade D will never be assigned. Also You are probably meant to use Select Case avgGrade (decFinalGrades / 5)

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thanks my logic was off :)

my math is wrong also. If i enter a 98 5 times I end up with a number like x.xx ??