Function Procedure Example

This section provides a tutorial example on how to define and invoke a function procedure that calculates the temperature value in Celsius from Fahrenheit.

To help you understand the concept of function procedure, I wrote the following the example, function_f2c.html:

<!-- function_f2c.html
 - Copyright (c) 1998 All Rights Reserved.
<script language="vbscript">
   d = F2C(70.0)
   document.writeln("Received Celsius = " & d)
   d = F2C(212.0)
   document.writeln("Received Celsius = " & d)

Function F2C(dFahrenheit)
   document.writeln("Converting Fahrenheit = " & dFahrenheit)
   dCelsius = (dFahrenheit - 32.0 ) / 1.8
   document.writeln("Returning Celsius = " & dCelsius)
   F2C = dCelsius
End Function

Here is the output:

Converting Fahrenheit = 70
Returning Celsius = 21.1111111111111
Received Celsius = 21.1111111111111

Converting Fahrenheit = 212
Returning Celsius = 100
Received Celsius = 100

Easy to understand. Right?

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

 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

 What Is a Procedure?

 "Function" Statement and Function Call

Function Procedure Example

 "Sub" Statement and Subroutine Call

 Sub (Subroutine) Procedure Example

 Passing Arguments to Procedures

 Example - Passing Arguments by Reference

 Example - Passing Arguments by Value

 Passing Arrays as Arguments

 Variable Scope in Procedures

 Example - Variable Scope in 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)


 Full Version in PDF/EPUB