Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TxtNumQuiz As System.Windows.Forms.TextBox
    Friend WithEvents BtnGo As System.Windows.Forms.Button
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents GroupBox2 As System.Windows.Forms.GroupBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents TxtTotal As System.Windows.Forms.TextBox
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents TxtAve As System.Windows.Forms.TextBox
    Friend WithEvents BtnClear As System.Windows.Forms.Button
    Friend WithEvents BtnQuit As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.TxtNumQuiz = New System.Windows.Forms.TextBox
        Me.BtnGo = New System.Windows.Forms.Button
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.GroupBox2 = New System.Windows.Forms.GroupBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.TxtTotal = New System.Windows.Forms.TextBox
        Me.Label4 = New System.Windows.Forms.Label
        Me.TxtAve = New System.Windows.Forms.TextBox
        Me.BtnClear = New System.Windows.Forms.Button
        Me.BtnQuit = New System.Windows.Forms.Button
        Me.GroupBox1.SuspendLayout()
        Me.GroupBox2.SuspendLayout()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 24.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(224, 32)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(169, 49)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Quizzes"
        '
        'Label2
        '
        Me.Label2.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.Location = New System.Drawing.Point(8, 40)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(112, 24)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "Number:"
        '
        'TxtNumQuiz
        '
        Me.TxtNumQuiz.Location = New System.Drawing.Point(144, 40)
        Me.TxtNumQuiz.Name = "TxtNumQuiz"
        Me.TxtNumQuiz.Size = New System.Drawing.Size(88, 22)
        Me.TxtNumQuiz.TabIndex = 2
        Me.TxtNumQuiz.Text = ""
        '
        'BtnGo
        '
        Me.BtnGo.Location = New System.Drawing.Point(64, 96)
        Me.BtnGo.Name = "BtnGo"
        Me.BtnGo.Size = New System.Drawing.Size(104, 32)
        Me.BtnGo.TabIndex = 3
        Me.BtnGo.Text = "Go"
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.Label2)
        Me.GroupBox1.Controls.Add(Me.TxtNumQuiz)
        Me.GroupBox1.Controls.Add(Me.BtnGo)
        Me.GroupBox1.Location = New System.Drawing.Point(32, 96)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(240, 176)
        Me.GroupBox1.TabIndex = 4
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "Start"
        '
        'GroupBox2
        '
        Me.GroupBox2.Controls.Add(Me.BtnQuit)
        Me.GroupBox2.Controls.Add(Me.BtnClear)
        Me.GroupBox2.Controls.Add(Me.Label4)
        Me.GroupBox2.Controls.Add(Me.TxtAve)
        Me.GroupBox2.Controls.Add(Me.Label3)
        Me.GroupBox2.Controls.Add(Me.TxtTotal)
        Me.GroupBox2.Location = New System.Drawing.Point(304, 96)
        Me.GroupBox2.Name = "GroupBox2"
        Me.GroupBox2.Size = New System.Drawing.Size(304, 232)
        Me.GroupBox2.TabIndex = 5
        Me.GroupBox2.TabStop = False
        Me.GroupBox2.Text = "Results"
        '
        'Label3
        '
        Me.Label3.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label3.Location = New System.Drawing.Point(24, 40)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(112, 24)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "Total Score"
        '
        'TxtTotal
        '
        Me.TxtTotal.Location = New System.Drawing.Point(160, 40)
        Me.TxtTotal.Name = "TxtTotal"
        Me.TxtTotal.ReadOnly = True
        Me.TxtTotal.Size = New System.Drawing.Size(88, 22)
        Me.TxtTotal.TabIndex = 4
        Me.TxtTotal.Text = ""
        '
        'Label4
        '
        Me.Label4.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label4.Location = New System.Drawing.Point(24, 88)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(112, 24)
        Me.Label4.TabIndex = 5
        Me.Label4.Text = "Average"
        '
        'TxtAve
        '
        Me.TxtAve.Location = New System.Drawing.Point(160, 88)
        Me.TxtAve.Name = "TxtAve"
        Me.TxtAve.ReadOnly = True
        Me.TxtAve.Size = New System.Drawing.Size(88, 22)
        Me.TxtAve.TabIndex = 6
        Me.TxtAve.Text = ""
        '
        'BtnClear
        '
        Me.BtnClear.Location = New System.Drawing.Point(32, 144)
        Me.BtnClear.Name = "BtnClear"
        Me.BtnClear.Size = New System.Drawing.Size(104, 40)
        Me.BtnClear.TabIndex = 7
        Me.BtnClear.Text = "Clear"
        '
        'BtnQuit
        '
        Me.BtnQuit.Location = New System.Drawing.Point(168, 144)
        Me.BtnQuit.Name = "BtnQuit"
        Me.BtnQuit.Size = New System.Drawing.Size(104, 40)
        Me.BtnQuit.TabIndex = 8
        Me.BtnQuit.Text = "Quit"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(632, 448)
        Me.Controls.Add(Me.GroupBox2)
        Me.Controls.Add(Me.GroupBox1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.GroupBox1.ResumeLayout(False)
        Me.GroupBox2.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub BtnQuit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnQuit.Click
        Me.Close()

    End Sub

    Private Sub BtnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnClear.Click
        TxtNumQuiz.Text = ""
        TxtTotal.Text = ""
        TxtAve.Text = ""
    End Sub

    Private Sub BtnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnGo.Click
        ' ensure that input is valid
        Dim quizzes As Integer
        If IsNumeric(TxtNumQuiz.Text) Then
            quizzes = Convert.ToInt32(TxtNumQuiz.Text)
            If quizzes > 0 And quizzes <= 15 Then
                ' got good input - loop that many times
                Dim cnt As Integer = 1
                Dim sum As Integer = 0
                ' loop through all of the quizzes
                ' NOTE would probably be easier with a for loop, but wanted to get in a point about infinite loops
                Do While cnt <= quizzes
                    Dim curr As Integer
                    Dim currStr As String
                    currStr = InputBox("What is your score on quiz number " & cnt & "? ")
                    ' check if valid input
                    ' if so, update counter and accumulator
                    ' probably should validate range of quiz scores too
                    If IsNumeric(currStr) Then
                        curr = Convert.ToInt32(currStr)
                        sum = sum + curr             ' accumulator
                        cnt = cnt + 1                ' counter
                    Else
                        MsgBox("Please enter a number")
                    End If
                Loop
                Dim ave As Double 
                ave = sum / quizzes
                TxtTotal.Text = sum.ToString("n0")
                TxtAve.Text = ave.ToString("n1")
            Else
                MsgBox("The number of quizzes must be between 1 and 15")
            End If
        Else
            MsgBox("Please enter a number for number of quizzes")
        End If
    End Sub
End Class