Hello everyone.
I have been struggling with my programming class from day one. I still can't seem to grasp the complete logic on how to write code. Anyhow, I have an assignment due that I am stuck on. Here is the assignment:
In this exercise, you code an application that displays a letter grade based on the
average of three test scores. Open the Grade Solution (Grade Solution.sln) file,
which is contained in the ClearlyVB\ Chapl8\Grade Solution folder. Code the application,
using a function to determine and return the letter grade. If the average is at
least 90, the grade is A. If the average is at least 80 but less than 90, the grade is B.
If the average is at least 70 but less than 80, the grade is C. Tf the average is at least
60 but less than 70, the grade is D. If the average is below 60, the grade is F.
You will be developing the code for the function on your own. Below the Public Class frmMain line, insert this function header:
Private Function CalculateGrade(ByVal testScore1 As Decimal, ByVal testScore2 As Decimal, ByVal testscore3 As Decimal) As String
In the function, declare variables for the average score and the letter grade. Calculate the average, use IF/Elself statements to determine the letter grade, and return the letter grade. Create a subprocedure for the Click event for the btnDisplay button. It should call the CalculateGrade function with three arguments ( the three test scores from the text boxes), and display the returned value in the lblGrade box.
This is what I have so far:
Public Class frmMain
Private Function CalculateGrade(ByVal testScore1 As Decimal, ByVal testScore2 As Decimal, ByVal testScore3 As Decimal) As String
Dim AverageScore As String
Dim strLetterGrade As Object
Dim intNum1 As Integer
Dim intNum2 As Integer
Dim intNum3 As Integer
Dim intNum4 As Integer
AverageScore = (testScore1 + testScore2 + testScore3) / 3
strLetterGrade = {"A" , "B" , "C" , "D" , "F"}
intNum1 = 90
intNum2 = 80
intNum3 = 70
intNum4 = 60
If AverageScore >= 90 Then
Return strLetterGrade("A")
ElseIf AverageScore >= 80 Then
Return strLetterGrade("B")
ElseIf AverageScore >= 70 Then
Return strLetterGrade("C")
ElseIf AverageScore >= 60 Then
Return strLetterGrade("D")
ElseIf AverageScore < 60 Then
Return strLetterGrade("F")
End If
Return strLetterGrade
End Function
Dim testScore1 As Decimal
Dim testScore2 As Decimal
Dim testScore3 As Decimal
Dim AverageScore As String = (testScore1 + testScore2 + testScore3) / 3
Private Sub btnDisplay_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
' Display the average score
lblGrade.Text = AverageScore
End Sub
Private Sub btnExit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnExit.Click
Me.Close()
End Sub
Private Sub txtTest1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTest1.KeyPress, _
txtTest2.KeyPress, txtTest3.KeyPress
' allows the text box to accept only numbers, the period, and the Backspace key
If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso e.KeyChar <> "." _
AndAlso e.KeyChar <> ControlChars.Back Then
e.Handled = True
End If
End Sub
Private Sub txtTest1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtTest1.TextChanged, _
txtTest2.TextChanged, txtTest3.TextChanged
lblGrade.Text = String.Empty
End Sub
End ClassI am going to have to re-study this material over the summer to try and understand it better, but for now I could use any suggestions that are offered.
Thank you,
Terry
