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Event Driven Programming Kumar Vishal, Lovely Professional University

Unit 8: Understanding Function and Procedure

CONTENTS

Objectives
Introduction
8.1 Meaning of Understanding Function and Procedure
8.2 Function Procedure
8.3 User-Defined Function Having Several Parameters

8.4 User-Defined Function Having No Parameters
8.5 Comparing Function Procedures with Sub Procedures
8.6 Collapsing a Procedures with a Region Directive
8.7 Modules
8.8 Summary
8.9 Keywords
8.10 Self Assessment Questions
8.11 Review Questions
8.12 Further Readings

Objectives

After studying this unit, you will be able to:
• Understanding function and procedure definition
• Discuss user defined functions with several parameters
• Explain the function procedures and its features.

Introduction

In your code you may frequently need to use the same instructions, by declaring a function/
procedure and typing the needed instructions into it you can replace the repeated instructions
with a call to this function. Functions/Procedures are a very useful part of Visual Basic program-
ming because your code will be smaller more stable, faster and easy to debug.
The difference between them is that functions must return a value and procedures do not.
Visual Basic offers different types of procedures to execute small sections of coding in
applications. Visual Basic programs can be broken into smaller logical components called
Procedures. Procedures are useful for condensing repeated operations such as the frequently
used calculations, text and control manipulation, etc. The benefits of using procedures in
programming are:

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