As you work through the example in this book, you may choose either to type in all the code manually
or to use the source code files that accompany the book. All of the source code used in this book is
available . Once at the site, simply locate the book’s title (either by using
the Search box or by using one of the title lists) and click the Download Code link on the book’s detail
page to obtain all the source code for the book.
Code snippet that  are easily identified with an icon; the file name
of the code snippet follow in a code note that appear after the code, much like the one that follow
this paragraph. If it is an entire code listing, the file name should appear in the listing title.
ERRATA
Every effort is made to ensure that there are no errors in the text or in the code. However, no one is
perfect, and mistake do occur. If you find an error in one of our book, such as a spelling mistake or

a faulty piece of code, your feedback is welcome. By sending in errata, you might save another reader
hours of frustration, and at the same time you will help us provide even higher quality information.