When a user wants to execute a group of statements depending upon a value of an Expression, then Switch Case is used. Each value is called a Case, and the variable is being switched ON based on each case. Case Else statement is executed if the test expression doesn't match any of the Case specified by the user.
Case Else is an optional statement within Select Case, however, it is a good programming practice to always have a Case Else statement.
Following is the syntax of a Switch statement in VBScript.
Select Case expression Case expressionlist1 statement1 statement2 .... .... statement1n Case expressionlist2 statement1 statement2 .... .... Case expressionlistn statement1 statement2 .... .... Case Else elsestatement1 elsestatement2 .... .... End Select
For demo purpose, let us find the type of integer with the help of a function.
Private Sub switch_demo_Click() Dim MyVar As Integer MyVar = 1 Select Case MyVar Case 1 MsgBox "The Number is the Least Composite Number" Case 2 MsgBox "The Number is the only Even Prime Number" Case 3 MsgBox "The Number is the Least Odd Prime Number" Case Else MsgBox "Unknown Number" End Select End Sub
When the above code is executed, it produces the following result.
The Number is the Least Composite Number