Constant is a named memory location used to hold a value that CANNOT
be changed during the script execution. If a user tries to change a
Constant value, the script execution ends up with an error. Constants
are declared the same way the variables are declared.
Following are the rules for naming a constant.
Following are the rules for naming a constant.
- You must use a letter as the first character.
- You can't use a space, period (.), exclamation mark (!), or the characters @, &, $, # in the name.
- Name can't exceed 255 characters in length.
- You cannot use Visual Basic reserved keywords as variable name.
Syntax
In VBA, we need to assign a value to the declared Constants. An error is thrown, if we try to change the value of the constant.Const <<constant_name>> As <<constant_type>> = <<constant_value>>
Example
Let us create a button "Constant_demo" to demonstrate how to work with constants.Private Sub Constant_demo_Click() Const MyInteger As Integer = 42 Const myDate As Date = #2/2/2020# Const myDay As String = "Sunday" MsgBox "Integer is " & MyInteger & Chr(10) & "myDate is " & myDate & Chr(10) & "myDay is " & myDay End Sub
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