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Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

You're reading from   Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide Create games beyond your imagination with the Unreal Development Kit

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Product type Paperback
Published in Dec 2011
Publisher Packt
ISBN-13 9781849691925
Length 466 pages
Edition 1st Edition
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Author (1):
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Rachel Cordone Rachel Cordone
Author Profile Icon Rachel Cordone
Rachel Cordone
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Table of Contents (18) Chapters Close

Unreal Development Kit Game Programming with UnrealScript
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Project Setup and Test Environments FREE CHAPTER 2. Storing and Manipulating Data 3. Understanding the Class Tree 4. Making Custom Classes 5. Using Functions 6. Using States to Control Behavior 7. Working with Kismet 8. Creating Multiplayer Games 9. Debugging and Optimization 10. Odds and Ends Pop Quiz Answers Index

Time for action – Using booleans


The first thing we need to do is tell the game about our variable. This is called declaration. Variables need to be declared before they can be used. Our declaration tells the game what type of variable it is as well as its name.

We'll continue with our "is it raining?" scenario for this experiment. In a game we might want to use this variable to check whether we should spawn rain effects or make changes to the lights, and so on.

Variable declaration in UnrealScript happens after the class declaration line, and before any functions. Let's add a variable to AwesomeActor.uc to see if it's raining or not.

  1. Open up our AwesomeActor.uc class in ConTEXT and add this line after our class declaration:

    var bool bIsItRaining;

    The var tells the game that we're declaring a variable. After that, is the variable type, in this case bool for boolean. After that, we tell the game our variable's name, bIsItRaining . Spaces can't be used in variable names, but underscore characters...

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