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Aaron Hillegass

Copyright © 2011 Big Nerd Ranch, Inc.

All rights reserved. Printed in the United States of America. This publication is protected by copyright, and permission must be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permissions, contact

Big Nerd Ranch, Inc.

154 Krog Street

Suite 100

Atlanta, GA 30307

(404) 478-9005

http://www.bignerdranch.com/

book-comments@bignerdranch.com

The 10-gallon hat with propeller logo is a trademark of Big Nerd Ranch, Inc.

Exclusive worldwide distribution of the English edition of this book by

Pearson Technology Group

800 East 96th Street

Indianapolis, IN 46240 USA

http://www.informit.com

The authors and publisher have taken care in writing and printing this book but make no expressed or implied warranty of any kind and assume no responsibility for errors or omissions. No liability is assumed for incidental or consequential damages in connection with or arising out of the use of the information or programs contained herein.

App Store, Apple, Cocoa, Cocoa Touch, Instruments, Interface Builder, iOS, iPad, iPhone, iTunes, iTunes Store, Mac, Mac OS, Objective-C, and Xcode are trademarks of Apple, Inc., registered in the U.S. and other countries.

Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and the publisher was aware of a trademark claim, the designations have been printed with initial capital letters or in all capitals.

Print ISBN-10 0321706285

Print ISBN-13 978-0321706287

Library of Congress Control Number: 2011931707

First printing, November 2011

Acknowledgments

It is a great honor that I get to work with such amazing people. Several of them put a lot of time and energy into making this book great. I’d like to take this moment to thank them.

Mikey Ward wrote several chapters of this book including Your First iOS Application, Your First Cocoa Program, and Blocks. If I were a nicer boss, I would have put his name on the cover.

The other instructors who teach the Objective-C materials fed us with a never-ending stream of suggestions and corrections. They are Scott Ritchie, Mark Fenoglio, Brian Hardy, Christian Keur, and Alex Silverman.

My tireless editor, Susan Loper, took my stream-of-consciousness monologue that stumbled across everything a programmer needs to know and honed it into an approachable primer.

Several technical reviewers helped me find and fix flaws. They are James Majors, Mark Dalrymple, Scott Steinman, Bart Hoffman, Bolot Kerimbaev, and Nate Chandler.

Ellie Volckhausen designed the cover.

Chris Loper at IntelligentEnglish.com designed and produced the EPUB and Kindle versions.

The amazing team at Pearson Technology Group patiently guided us through the business end of book publishing.

Table of Contents

I. Getting Started

1. You and This Book

C and Objective-C

How this book works

How the life of a programmer works

2. Your First Program

Installing Apple’s developer tools

Getting started with Xcode

Where do I start writing code?

How do I run my program?

So what is a program?

Don’t stop

II. How Programming Works

3. Variables and Types

Types

A program with variables

Challenge

4. if/else

Boolean variables

else if

For the More Curious: Conditional (ternary) operator

Challenge

5. Functions

When should I use a function?

How do I write and use a function?

How functions work together

Local variables, frames, and the stack

Recursion

Looking at the frames in the debugger

return

Global and static variables

Challenge

6. Numbers

printf()

Integers

Tokens for displaying integers

Integer