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Computer Science Programming
Basics with Ruby
Ophir Frieder, Gideon Frieder, and David Grossman
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Computer Science Programming Basics with Ruby
by Ophir Frieder, Gideon Frieder, and David Grossman
Copyright © 2013 Ophir Frieder, Gideon Frieder, and David Grossman. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
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Editors:
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Proofreader:
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April 2013:
First Edition
Cover Designer:
Randy Comer
Interior Designer:
David Futato
Illustrators:
Rebecca Demarest and Kara Ebrahim
Revision History for the First Edition:
2013-04-15:
First release
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for release details.
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While every precaution has been taken in the preparation of this book, the publisher and authors assume
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ISBN: 978-1-449-35597-5
[LSI]
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Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1. Introduction to Computer Science. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Introduction
1.2 Application Development
Step 1: Understand the Problem
Step 2: Write Out the Solution in Plain Language
Step 3: Translate the Language into Code
Step 4: Test the Code in the Computer
1.3 Algorithms
1.3.1 Algorithm Efficiency
1.4 Summary
1.4.1 Key Concepts
1.4.2 Key Definitions
1.5 Exercises
1
2
2
3
3
4
4
5
6
6
7
7
2. How Does the Computer Really Work?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Introduction
2.2 Basic Nomenclature and Components of a Computer System
2.3 Scales of Magnitude
2.4 Instruction Execution—Speed and Timing Scales
2.5 Bit Strings and Their Meaning
2.6 The Interpreter Process and Ruby
2.7 Summary
2.7.1 Key Concepts
2.7.2 Key Definitions
2.8 Exercises
11
11
14
16
17
19
21
21
22
22
3. Core Programming Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
iii
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