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Lesson 11 Select Case


In the previous lesson, we have learned how to use If….Then….Else statement. However, for multiple options, the If…Then…Else structure could become too bulky and difficult to debug. Fortunately, Excel 2010 VBA provides another way to handle complex multiple-choice cases, that is, the Select Case…End Select decision structure. The structure of Select Case…End Select is as follows:

Select Case variable
Case value 1
Statement
Case value 2
Statement
Case value 3
Statement
.
.
Case Else
End Select
 

Example 11.1

In this example, we want to automatically assign a remark in relation to a certain examination grade. For example, if the grade is A, we shall assign remark as High distinction, A- as distinction and so forth. To enter the code, start Excel 2010 then place a command button onto the spreadsheet and click on it to launch the Excel 2010 VBA editor.

Private Sub CommandButton1_Click()

Dim grade As String
Dim grade As String
 grade = InputBox("Enter the grade(A, A-, B, C, E or F")
Select Case grade
 Case "A"
  MsgBox "High Distinction"Case "A-"
  MsgBox "Distinction"
 Case "B"
  MsgBox "Credit"
 Case "C"
  MsgBox "Pass"
 Case Else
  MsgBox "Fail"
End Select

End Sub

Example 11.2

In this example, we shall show you how to process the grades of students according to the marks given. For example, if a student’s mark is 85, the corresponding grade is A and if the mark is 20 the grade will be F and so forth. We can use the statement case value1 to value 2 to specify the range of values that fulfill the particular case.

You should also include the error case where the values entered are out of the range or invalid. For example, if the examination mark is from 0 to 100, then any value out of this range is invalid.

Private Sub CommandButton1_Click()

Dim mark As Single
Dim grade As String
 mark = InputBox("Enter the mark")
Select Case mark
 Case 0 To 29
  grade = "F"
 Case 30 To 49
  grade = "E"
 Case 50 To 59
  grade = "D"
 Case 60 To 69
  grade = "C"
 Case 70 To 79
  grade = "B"
 Case 80 To 100
  grade = "A"
 Case Else
  grade = "Error!"
End Select
 MsgBox grade

End Sub

Example 11.3

We can modify Example 11.2 into a user-defined function for use to create a examination report in an Excel Sheet. You can need to key in the mark and use the function to compute the grade in the adjacent cell. For other row, just need to click the dot at the right bottom of te first cell and drag it to where you want, the grade will be automatically updated.

Start an Excel workbook and insert a module in the Visual Basic Editor, and enter the following code:

Function grade(mark As Integer) As String

Select Case mark
 Case 0 To 29
  grade = "F"
 Case 30 To 49
  grade = "E"
 Case 50 To 59
  grade = "D"
 Case 60 To 69
  grade = "C"
 Case 70 To 79
  grade = "B"
 Case 80 To 100
  grade = "A"
 Case Else
  grade = "Error!"
End Select

End Function

Figure 11.1 Examination Report





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