VBA

Visual Basic Editor in MS Excel is just as powerful as the stand alone Visual Basic compiler in the sense that you can use the same commands in programming. For example, you can use If..Then...Else to control program flow and display certain output based on certain conditions in MS Excel. Here, I am going to demonstrate the concept using one example.

Private Sub CommandButton1_Click()
Dim mark As Integer
Dim grade As String
Randomize Timer
mark = Int(Rnd * 100)
Cells(1, 1).Value = mark
If mark < 20 And mark >= 0 Then
grade = "F"
Cells(2, 1).Value = grade
ElseIf mark < 30 And mark >= 20 Then
grade = "E"
Cells(2, 1).Value = grade
ElseIf mark < 40 And mark >= 30 Then
grade = "D"
Cells(2, 1).Value = grade
ElseIf mark < 50 And mark >= 40 Then
grade = "C-"
Cells(2, 1).Value = grade
ElseIf mark < 60 And mark >= 50 Then
grade = "C"
Cells(2, 1).Value = grade
ElseIf mark < 70 And mark >= 60 Then
grade = "C+"
Cells(2, 1).Value = grade
ElseIf mark < 80 And mark >= 70 Then
grade = "B"
Cells(2, 1).Value = grade
ElseIf mark <= 100 And mark > -80 Then
grade = "A"
Cells(2, 1).Value = grade
End If
End Sub

In this program, you place the command button 1 on the MS Excel spreadsheet and go into the VB editor by clicking on the button. At the VB editor, key in the program codes as shown on the left.

I use randomize timer and the RND function to generate random numbers. In order to generate random integers between 0 and 100, I combined the syntax Int(Rnd*100). For example, when Rnd=0.6543, then Rnd*100=65.43, and Int(65.43)=65. Using the statement cells(1,1).Value=mark will place the value of 65 into cell(1,1).

Now, based on the mark in cells(1,1), I use the If.......Then....Elseif statements to put the corresponding grade in cells(2,1). So, when you click on command button 1, it will put a random number between 1 and 100 in cells(1,1) and the corresponding grade in cells(2,1).

The Interface is show below:

VBA III - Using If.....Then....Else