Assigning Values to Variables

VBScript Tutorials - Herong's Tutorial Examples - Version 5.20, by Dr. Herong Yang

VBScript Tutorials - Herong's Tutorial Examples

∟Variable Declaration and Assignment Statement

∟Assigning Values to Variables - "=" Statement

This section provides a quick introduction of the assignment statement, which allows you to assign a new value to a variable.

Variables can be assigned with new values with the assignment statement in the following syntax:

   variable_name = data_value

where "data_value" a data literal or an expression. We will look at expressions in details in other parts of this book.

When assigning a new value to a variable:

The old value in the variable will be removed.
The new value will be saved into the variable.
The subtype of new value does not have to match with the subtype of the old value.

Here is a tutorial example on how to declare variables and assign values to them:

<html>
<body>
<!-- assignment.html
 - Copyright (c) 2015, HerongYang.com, All Rights Reserved.
-->
<pre>
<script language="vbscript">
   Dim author
   Dim price
'   Dim empty
   
   author = "Herong"
   price = 9.99 
'   empty = 0
   
   buffer = price   ' Implicit declaration of "buffer"
   price = author
   author = buffer
   
   document.writeln("author = " & author)
   document.writeln("price = " & price)
   document.writeln("empty = " & empty)
</script>
</pre>
</body>
</html>

Here is the output of this VBScript example:

author = 9.99
price = Herong
empty =

Notes about this VBScript example:

Statement, Dim empty, is commented out, because "empty" is a reserved keyword. It can not be used as a variable name.
Statement, author = "Herong", assigns value "Herong" to variable "author".
Statement, price = author, assigns the value from variable "author" to variable "price". Not that the subtype of the new value does not match the subtype of the new value.

Table of Contents

About This Book

Introduction of VBScript - Visual Basic Scripting Edition

Variant Data Type, Subtypes, and Literals

Arithmetic Operations

Numeric Comparison Operations and Logical Operations

String Operations - Concatenation and Comparison

►Variable Declaration and Assignment Statement

Variable Declaration and "Dim" Statement

►Assigning Values to Variables - "=" Statement

Empty - The Default Value of a Variable

Expression and Order of Operation Precedence