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One lesson to pull from this code is to always initialize your variables, preferably right where they are defined. In the previous example, no harm was done, since we initialized i in the for loop. But suppose we used i in a different way and simply forgot to initialize it. The random nature of uninitialized variables can make bugs very hard to track down. Take a look at this version of the same code:

Warning Take all appropriate safety precautions before measuring live electrical outlets In a classroom, you have the bene t of an instructor to show you how to do these exercises the rst time If you re doing these on your own with no experience, seek the advice of a trained technician or instructor

When I wrote the very first edition of Learn C on the Macintosh back in 1991, I was writing with college students in mind. After all, in college was where I really learned to program. It seems I was way off. My first clue that I had underestimated my audience was when I started getting e-mails from fifth graders who were making their way through the book. Fifth graders! And

not just one but lots of nine-, ten-, and eleven-year-old kids were digging in and learning to program. Cool! And the best part of all was when these kids started sending me actual shipping products that they created. You can t imagine how proud I was and still am. Over the years, I ve heard from soccer moms, hobbyists, even folks who were using the Mac for the very first time, all of whom made their way through Learn C on the Macintosh and came out the other end, proud, strong, and full of knowledge. So what do you need to know to get started Although learning C by just reading a book is possible, you ll get the most out of this book if you run each example program as you encounter it. To do this, you ll need a Mac running Mac OS X (preferably version 10.5 or later) and an Internet connection. You ll need the Internet connection to download the free tools Apple has graciously provided for anyone interested in programming the Mac and to download the programs that go along with this book. Again, if you know nothing about programming, don t worry. The first few chapters of this book will bring you up to speed. If you have some programming experience (or even a lot), you might want to skim the first few chapters, and then dig right into the C fundamentals that start in 3.

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Step 2 Determine whether or not your electrical socket is live Do this with your electrical outlet tester Plug your outlet tester (see Figure 8-2) into the electrical outlet or power strip where you plug in the PC Look at the LED indicators Are they showing good power Step 3 Now measure the voltage between the hot and neutral openings of the outlet Start by setting your multimeter to AC voltage; do not proceed until you re sure you have done this correctly! If you aren t sure, ask your instructor for guidance Referring to Figure 8-3, take the black probe and place it in the neutral opening of the wall socket Make sure you have good contact inside the outlet The metal probe tip must contact the metal connector inside the outlet

Here s a quick tour of what s to come in this book: 2 takes you to Apple s web site, so you can download the free tools we ll use throughout this book. 3 starts you off with the basics of building a simple program. 4 shows you how to embed a series of programming statements into a reusable function, something you can call again and again. 5 adds variables and operators into the mix, bringing the power of mathematical expressions into your programs. 6 introduces the concept of flow control, using constructs like if, else, do, and while to control the direction your program takes. 7 covers pointers and parameters, two concepts that will add a dramatic new level of power to your programs. 8 extends the simple data types used in the first half of the book, adding the ability to work with more complex data types like arrays and text strings.