[RESOLVED] Writing average to TXT

I need some help writing ten(10) input numbers to a text file, and displaying the average in the program, with the two lowest numbers dropped. The project is supposed to allow a user to input 10 number scores and the program will display the average of the scores with the 2 lowest dropped, and write the 10 scores to a text file to display.
The problem is I cant get it to display the average correctly
Here is my code so far

Any help is appreciated

Code:

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    Private Sub btnEnterTemp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEnterTemp.Click
        '  This button accepts and displays up to 10 Scores from user
        '  then calculates and displays the average score, with 2 lowest dropped, and writes to a TXT file

        Dim strScores As String

        Dim decAverage As Decimal
        Dim decTotalOfAllScores As Decimal = 0
        Dim strInputMessage As String = "Enter Project score #"
        Dim strInputHeading As String = "Project Score"
        Dim strNormalMessage As String = "Enter the Project Score #"
        Dim strNonNumericError As String = "Error- Enter a Number for Project #"
        Dim strNegativeError As String = "Error- Enter a Positive Number  #"

        Dim strProjectScore(10) As String


        Dim objWriter As New IO.StreamWriter("scores.txt")
        Dim intCount As Integer

        For intCount = 0 To (strProjectScore.Length - 1)
            strProjectScore(intCount) = InputBox("Please enter score")

            If IO.File.Exists("scores.txt") Then
                objWriter.WriteLine(strProjectScore(intCount))

            Else
                MsgBox("File not available")
                Close()

            End If
        Next
        objWriter.Close()


        ' Loop Variables

        Dim strCancelClick As String = ""
        Dim intMaxNumberOfEntries As Integer = 10
        Dim intNumberOfEntries As Integer = 1

        ' This loop allows the user to enter up to 10 grades.
        ' The loop terminates when the user has entered 10 grades or the user
        ' clicks the Cancel or Close Button in the input box.

        strScores = InputBox(strInputMessage & intNumberOfEntries, strInputHeading, "")

        'Makes label visible
        lblAverageTemps.Visible = True

        ' Calculates and displays the Average Scores
        If intCount > 1 Then
            decAverage = decTotalOfAllScores / (intNumberOfEntries - 1)
            lblAverageTemps.Text = "Average project score is  " & _
                decAverage.ToString("F1")
        Else
            lblAverageTemps.Text = "No score Entered"
        End If

        'Disables Enter Temp Button
        btnEnterTemp.Enabled = False
    End Sub

---

Here ya go:

Code:

---

        Dim marks As New List(Of Single)
        marks.Add(7.9)
        marks.Add(4.6)
        marks.Add(9.2)
        marks.Add(3.1)
        marks.Add(5.4)
        'etc
        'remove lowest values (sort and remove first two)
        marks.Sort()
        marks.RemoveRange(0, 2)
        'get average
        Dim avg As Single
        For Each mark As Single In marks
            avg += mark / marks.Count
        Next
        MsgBox(avg)

---

First you make sure the "Marks" list gets filled with the (10 or more) marks.
Then you sort the marks from low to high
Then you remove the first two marks
Then you get the average

To write to a text file use a streamwriter:

Code:

---

        Dim s As New IO.StreamWriter("mymarks.txt", True)
        For Each m As Single In marks
            s.WriteLine(m)
        Next
        s.WriteLine("Average: " & avg)
        s.Close()

---

To display all marks, place the For write loop before the "RemoveRange" and, if you want to leave the marks unsorted, before the "Sort()" line.
You can always add the stream declaration on top of everything and write lines in-code. Just make sure you close the stream in the end.

i'd do it differently:

vb Code:

Public Class Form1
 
    Dim numbers As List(Of Integer)
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        numbers = New List(Of Integer)(9)
        For x As Integer = 1 To 10
            Dim number As Integer
            If Integer.TryParse(InputBox("Enter an Integer"), number) Then
                numbers.Add(number)
            Else
                x -= 1
            End If
        Next
        numbers.Sort()
        IO.File.WriteAllLines("numbers.txt", Array.ConvertAll(numbers.ToArray, Function(i) i.ToString))
        Process.Start("numbers.txt")
        MsgBox(numbers.Skip(2).Average)
    End Sub
 
End Class

I'm trying to make this simpler for me to understand. I already have a program that when I press a button, it asks for 10 scores and when you enter each one, it populates a Listbox, then on the last score entered, it shows the average in a LabelObject. I need to drop the 2 lowest from the equation and write all 10 to a TXT

Is there a way to write the objects in a Listbox to a TXT file?

Yep, I guess using:

Code:

---

numbers.Skip(2).Average

---

is a bit more clear, although I guess marks are given with decimals, so not sure about using an integer. Used the loop to demonstrate "calculating an average" btw. :bigyello:

EDIT

I guess you can use the "writealllines" function, but I never really liked that function. (there is no moment of closing visible)
Any ways, a listbox contains an "Items()" property, you can use that to write out all items:

Code:

---

        For Each mark As String In mymarklistbox.Items
            s.WriteLine(mark)
        Next

---

This also seems possible, but not sure if it works:

Code:

---

s.WriteLine(mymarklistbox.Items)

---

Or may be there is some sort of build-in function for it, but I rather stay with writing from a loop.

Excellent help, this is EXACTLY what I needed!

Thanks for quick responses

Only thing is that I still need to compute the average

to write your listbox items:

vb Code:

IO.File.WriteAllLines("numbers.txt", Array.ConvertAll(ListBox1.Items.Cast(Of Object).ToArray(), Function(o) o.ToString))

Quote:

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Originally Posted by bergerkiller

Yep, I guess using:

Code:

---

numbers.Skip(2).Average

---

is a bit more clear

---

yep

Quote:

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Originally Posted by bergerkiller

not sure about using an integer.

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that's easily changed. it wasn't intended as a copy + paste instant fix.
you learn far more reading + understanding the code.

Quote:

---

Originally Posted by bergerkiller

I guess you can use the "writealllines" function.

---

see my previous post

Quote:

---

Originally Posted by bergerkiller

This also seems possible, but not sure if it works:

Code:

---

s.WriteLine(mymarklistbox.Items)

---

---

it doesn't

Quote:

---

Only thing is that I still need to compute the average

---

That was dealt with a few posts ago: store your marks in a list (of single/decimal/integer/double/your choice) and use:

Code:

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Dim average As Single = marks.Skip(2).Average

---

Yes, got it working.

Thanks again