vb.net barcode font 4: C Basics: Functions in Java

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CHAPTER 4: C Basics: Functions
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The Standard Library
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One element of the ISO C standard that relates directly to our discussion of functions is the Standard Library. The Standard Library is a set of functions available to every ISO C programmer. As you may have guessed, the printf() function you ve seen in our sample source code is part of the Standard Library, as are tons of other great functions. You ll learn some of the more popular ones as you make your way through this book. Once you get comfortable with the Standard Library functions presented here, dig through some of the Standard Library documentation that you ll find on the Web, just to get a sense of what else is in there. A number of great sites discuss the Standard Library. One of my favorite resources on the net is Wikipedia (http:// www.wikipedia.org), an open-content, collaborative encyclopedia. If you ve never played with Wikipedia, here s an excellent link to get you started:
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http://en.wikipedia.org/wiki/ANSI_C_standard_ library
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This page is a terrific way to get to know the Standard Library. There s a lot of interesting information here, but the best part is the table titled C Standard Library headers on the right side of the page, as shown in Figure 4-3. It contains a link to each of the Standard Library #include files. Each link takes you to a page that describes the functions included in that particular header file. For example, click the stdio.h link. Wow, there sure are a ton of functions in this header file. If you scroll down a bit, you ll find a link to a page that describes the Standard Library function printf(). Follow that link, and you ll come to a page that contains just about everything you could ever want to know about printf(). Yeah, it s a bit techie, but it s an invaluable reference resource once you start developing your own code or if you encounter a function in this book and want to know more.
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Figure 4-3. This table of links on the Wikipedia page for the C Standard Library lists the Standard Library #include files. Click one of the links, and you ll be taken to a page that describes all the Standard Library functions covered by that #include file.
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CHAPTER 4: C Basics: Functions
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Another great page (also referenced at the bottom of the Wikipedia page) is the detailed C Standard Library reference maintained by our friends at the University of Tasmania:
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http://www.infosys.utas.edu.au/info/documentation/C/CStdLib.html
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Exploring Unix and Your Mac s Built-In Manual
One more thing is worth mentioning before we head back to functionville. Your Mac comes with an incredible built-in resource, just perfect for experimenting with C and learning about the Standard Library the Terminal application. Terminal is found in /Applications/ Utilities. In the Finder, you can use the shortcut U to bring up the Utilities folder. Once there, double-click the Terminal application to launch it. You should see something similar to Figure 4-4. Don t worry if your Terminal window looks a bit different than mine. That s perfectly normal.
Figure 4-4. The Terminal window, as it appears when the application is first launched. Your Terminal window may look slightly different no worries if it does.
CHAPTER 4: C Basics: Functions
The Terminal application allows us to communicate with the Mac s operating system, a variant of the Unix operating system. If you ve never heard of Unix, don t worry. You can spend your entire life without touching Unix, and you can still create incredibly wonderful and complex C applications. That said, if you are a little bit curious, I ll sprinkle a bit of Unix goodness here and there throughout this book. The Unix operating system was developed by a group of programmers at AT&T s Bell Laboratories in 1969. This was the same group that would go on to develop the C programming language. An operating system, or OS, is a program that runs on a computer, typically at startup, and is responsible for managing the computers resources and coordinating the computer s activities. One way to think of this is that the operating system sits in between your applications and your actual computer. In the Terminal window shown in Figure 4-4, you can see two lines of text. The first one is a welcome message that includes the date and time of your last login, or Terminal session. The second line is called the command prompt. Here s the command prompt from my Terminal window:
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