Book Image

Scratch Cookbook

By : Brandon Milonovich
Book Image

Scratch Cookbook

By: Brandon Milonovich

Overview of this book

Scratch 2.0 is an easy to use programming language that allows you to animate stories and create interactive games. Scratch also gives you the capability of using programming to calculate complicated calculations for you. Scratch Cookbook will lead you through easy-to-follow recipes that give you everything you need to become a more advanced programmer. Scratch Cookbook will take you through the essential features of Scratch. You'll then work through simple recipes to gain an understanding of the more advanced features of Scratch. You will learn how to create animations using Scratch. Sensory board integration (getting input from the outside environment) will also be covered, along with using Scratch to solve complicated and tedious calculations for you. You'll also learn how to work through the exciting process of project remixing where you build on the work of others. Scratch Cookbook will give you everything you need to get started with building your own programs in Scratch that involve sounds, animations, and user interaction.
Table of Contents (17 chapters)
Scratch Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Generating Fibonacci numbers


You might be asking yourself what Fibonacci numbers are. What we're talking about is a sequence of numbers generated recursively (that means through repeated computations). Each new Fibonacci number is computed by summing the previous two numbers. The set begins with 0 and 1, and then builds from there.

If we compute the first few ourselves, we'd have:

Third number = First number + Second number = 0 + 1 = 1

This leads to the sequence 0, 1, 1, 2, 3, 5, 8, 13, 21, …

Getting ready

We can see that generating these Fibonacci numbers can be a tedious task, particularly if we wanted to generate a lot of them. Luckily, we can use Scratch to generate as many Fibonacci numbers as we want.

Here, we will create a program that will do that for us (generating a maximum of 1,000 Fibonacci numbers). The output of these numbers will be a list of all Fibonacci numbers generated.

How to do it...

Follow these steps to work through this recipe:

  1. Open a new Scratch file.

  2. Create a new variable...