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Your First Program
Now that you know how this book is organized, it is time to see how programming for the Mac and for
iOS devices works. To do that, you will:
• install Apple’s Developer Tools
• create a simple project using those tools
• explore how these tools are used to make sure your project works
At the end of this chapter, you will have successfully written your first program for the Mac.
Installing Apple’s developer tools
To write applications for OSX (the Mac) or iOS (the iPhone and friends), you will be using Apple’s
developer tools. The main application that you will need is called Xcode.
Xcode is only available on the Mac (not Windows or Linux), so you will need a Mac to work with this
book. In addition, this book is based on Xcode�5, which is compatible with OS X 10.8 (Mountain Lion)
and higher.
You can download the latest version of Xcode for free from the Mac�App�Store. You may want to drag
the Xcode icon onto your Dock; you will be using it an awful lot.
Getting started with Xcode
Xcode is Apple’s Integrated Development Environment. Everything you need to write, build, and run
new applications is in Xcode.
A note on terminology: anything that is executable on a computer we call a program. Some programs
have graphical user interfaces; we call these applications.
Some programs have no graphical user interface and run for days in the background; we call these
daemons. Daemons sound scary, but they are not. You probably have about 60 daemons running on
your Mac right now. They are waiting around, hoping to be useful. For example, one of the daemons
running on your system is called pboard. When you do a copy and paste, the pboard daemon holds
onto the data that you are copying.
Some programs have no graphical user interface and run for a short time in the terminal; we call
these command-line tools. In this book, you will be writing mostly command-line tools to focus on
programming essentials without the distraction of creating and managing a user interface.
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