VBScript Tutorials - Herong's Tutorial Examples

∟Expression and Order of Operation Precedence

∟Examples of Expressions

This section provides a tutorial example showing you different types of expressions.

Now let me try to show you some expressions in an example script, expression.html: 

<html>
<body>
<!-- expression.html
 - Copyright (c) 1998 HerongYang.com. All Rights Reserved.
-->
<pre>
<script language="vbscript">
'  Expressions with a single data literal
   document.writeln("")
   document.writeln(777)
   document.writeln(0.00314159e30)
   document.writeln(TRUE)

'  Expressions with a single operation
   document.writeln("")
   document.writeln(3.333e200 + 0.111e200)
   document.writeln(11.0 * 1.0e20)
   document.writeln(1 = 1)
   document.writeln(9.9999e-1 < 1)
   document.writeln(True Or False)

'  Expressions with multiple operations
   document.writeln("")
   document.writeln(+ 1 - 2 * 3 / 4)
   document.writeln(+ 1 - 2 * 3 / 4 = ( + 1 - 2 ) * 3 / 4)
   document.writeln(1 - 2 * 3 / 4 = (1 - 2) * 3 / 4 And 0.9999 < 1)
</script>
</pre>
</body>
</html>

Here is the output of this VBScript example: 

777
3.14159E+27
True

3.444E+200
1.1E+21
True
True
True

-0.5
False
False

All results look correct to me.

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

►Expression and Order of Operation Precedence

 What Is an Expression?

 Precedences of Operations

►Examples of Expressions

 Statement Syntax and Statement Types

 Array Data Type and Related Statements

 Array References and Array Assignment Statements

 Conditional Statements - "If ... Then" and "Select Case"

 Loop Statements - "For", "While", and "Do"

 "Function" and "Sub" Procedures

 Built-in Functions

 Inspecting Variables Received in Procedures

 Error Handling Flag and the "Err" Object

 Regular Expression Pattern Match and Replacement

 scrrun.dll - Scripting Runtime DLL Library

 Creating Your Own Classes

 IE Web Browser Supporting VBScript

 IIS ASP Server Supporting VBScript

 WSH (Windows Script Host)

 References

 Full Version in PDF/EPUB