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VBA - Variables
Variable is a named memory location used to hold a value that can be changed during the script execution. Following are the basic rules for naming a variable.
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.
In VBA, you need to declare the variables before using them.
Dim <<variable_name>> As <<variable_type>>
There are many VBA data types, which can be divided into two main categories, namely numeric and non-numeric data types.
Numeric Data Types
Following table displays the numeric data types and the allowed range of values.
|Type||Range of Values|
|Byte||0 to 255|
|Integer||-32,768 to 32,767|
|Long||-2,147,483,648 to 2,147,483,648|
-3.402823E+38 to -1.401298E-45 for negative values
1.401298E-45 to 3.402823E+38 for positive values.
-1.79769313486232e+308 to -4.94065645841247E-324 for negative values
4.94065645841247E-324 to 1.79769313486232e+308 for positive values.
|Currency||-922,337,203,685,477.5808 to 922,337,203,685,477.5807|
+/- 79,228,162,514,264,337,593,543,950,335 if no decimal is use
+/- 7.9228162514264337593543950335 (28 decimal places).
Non-Numeric Data Types
Following table displays the non-numeric data types and the allowed range of values.
|Type||Range of Values|
|String (fixed length)||1 to 65,400 characters|
|String (variable length)||0 to 2 billion characters|
|Date||January 1, 100 to December 31, 9999|
|Boolean||True or False|
|Object||Any embedded object|
|Variant (numeric)||Any value as large as double|
|Variant (text)||Same as variable-length string|
Let us create a button and name it as 'Variables_demo' to demonstrate the use of variables.
Private Sub say_helloworld_Click() Dim password As String password = "Admin#1" Dim num As Integer num = 1234 Dim BirthDay As Date BirthDay = DateValue("30 / 10 / 2020") MsgBox "Passowrd is " & password & Chr(10) & "Value of num is " & num & Chr(10) & "Value of Birthday is " & BirthDay End Sub
Upon executing the script, the output will be as shown in the following screenshot.