2. Software Development, Homework

VB Program for Displaying the Average of 20 Marks

8 Comments

Below is the program from today’s lesson. It is not completed, I would like you to Change the program to display the average with two decimal places. Please add your solution with a comment below.

Private Sub CmdStart_Click()
'load an Array with data from a list box
'list box is hidden on the form
'List Boxes count from 0 so add a heading to the fist item
Dim IntNumber(20) As Integer
Dim StrName(20) As String
Dim intavg As Integer
Call Load_Array(IntNumber(), StrName())
Call Calc_Average(IntNumber(), intavg)
Call Display_Array(IntNumber(), StrName(), intavg)
End Sub

Private Sub Load_Array(ByRef Number() As Integer, ByRef StrName() As String)
Dim Counter As Integer 'local Variable
For Counter = 1 To 20
Number(Counter) = LstNumbers.List(Counter)
StrName(Counter) = LstNames.List(Counter)
Next
End Sub


Private Sub Calc_Average(ByRef IntNumber() As Integer, ByRef intavg As Integer)
Dim IntSum As Integer
For Counter = 1 To 20
IntSum = IntSum + IntNumber(Counter)
Next
intavg = IntSum / 20
End Sub

Private Sub Display_Array(ByRef Number() As Integer, ByRef StrName() As String, ByVal intavg)
'Standard procedure as used in previous programs
Dim Counter As Integer 'local Variable
For Counter = 1 To 20
Form1.Print StrName(Counter) & " scored " & Number(Counter) & "%"
Next
Form1.Print "Average = " & intavg & "%"
End Sub

8 thoughts on “VB Program for Displaying the Average of 20 Marks”

  6. Would you type in at a point “0.00” in order to achieve the 2 decimal places?
    Or when saying “intavg = IntSum / 20” instead say you are dividing by “20.00”, and also change the variable array answers to single instead of integer?

  7. Private Sub cmdCalculate_Click()
    Dim strDecimal(2) as String

    decimal = intSum + intNumber(counter)
    Round (intSum + intNumber(counter),2 )

    random stab at this but i thought if you could declare the variable and add the two together and round them it would come up !

  8. Remember that Integers do not have decimals!
    So we need to change the average to a single
    DIM SngAvg as Single
    Then we can use the format command – VB6 (check your notes)
    Form1.print “Average = ” & Format(sngAvg,”0.00%”)
    NOTICE – 0.00 is in quotes!
    You may find that this increase your answer by a factor of 100, how would you fix this?

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