This post will guide you how to declare, initialize and display a variable value in MS excel VBA.

Declare a VBA variable

If you want to declare a variable as Integer, just type the below code line:

Dim  myNum as Integer

Or

Dim myNum%

The above code declare a variable “myNum” as integer type.

Initialize a VBA variable

It’s very simple to initialize a VBA variable, just following the below code:

Dim myNum as Integer
myNum = 28

You must to declare the variable firstly, then initialize its value.

Data types

The data types contains Byte, Boolean, Integer, Long, Currency, Decimal, Single, Double, Date, String, Object, Variant and user defined type.  Each data type have different range of values, see below table:

Type	Range of Values
Byte	0 to 255
Boolean	True or False
Integer	-32768 to 32767
Long	-2,147,483,648 to 2,147,483,648
Single	-3.402823E+38 to -1.401298E-45 for negative values 1.401298E-45 to 3.402823E+38 for positive values.
Double	-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
Decimal	+/- 79,228,162,514,264,337,593,543,950,335 if no decimal is use +/- 7.9228162514264337593543950335 (28 decimal places).
String (fixed length)	1 to 65,400 characters
String (variable length)	0 to 2 billion characters
Date	January 1, 100 to December 31, 9999
Object	Any embedded object
Variant (numeric)	Any value as large as double
Variant (text)	Same as variable-length string

Example

Example1:  Variable declaration and initialization

1# open visual Basic Editor, then insert a module and name as :myVariableDecIniDemo1

2# enter into the below VBA codes in code window.

Sub myVariableDecIniDemo1()
    Dim myNum As Integer
    myNum = 45
    Dim myStr As String
    myStr = "excelhow.net"
    Dim birthD As Date
    birthD = 31 / 7 / 2017
    MsgBox "myNum is" & myNum & Chr(10) & "my string is " & myStr & Chr(10) & "my birthday is " & birthD
End Sub

3# back to workbook and run the above macro.