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Want to try this out for yourself In 2, you downloaded the project files for the book from the Apress web site. Open the Learn C Projects folder on your hard drive; next, open the
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CHAPTER 3: Programming Basics
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folder called 03.01 - sample, and double-click the file named sample.xcodeproj to open the project in Xcode. Figure 3-1 shows the project window associated with sample.xcodeproj. The project window is a complex beast, full of incredibly useful tools to help with our programming pursuits. The most important part of the project window, at least for the moment, is the editing pane, the area that allows us to edit our source code.
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Figure 3-1. An Xcode project window, showing some source code in the editing pane
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Open the console window by selecting Console from the Run menu or by typing R. Now run the program by selecting Build and Run from the Build menu or by typing R. The program should build and then run, and the text I showed you previously should appear in the console, albeit surrounded by some other text, like the date and an exit message. You can ignore the extra bits and revel in the fact that your program works! OK, enough reveling. Let s get back to the programming process.
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Compiling Your Source Code
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Once your source code is written, your next job is to hand it off to a compiler. The compiler translates your C source code into instructions that make sense to your computer. These instructions are known as machine language or object code. Source code is for you; machine language/object code is for your computer. You write the source code using an editor, and then the compiler translates your source code into a machine-readable form.
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Don t let the terminology bog you down. Read the rest of this chapter, just to get a basic sense of the programming process, and then move on to 4. I ll lay out everything step-by-step for you, so you won t get lost.
Think of the process of building and running your program as a three-stage process. First, Xcode compiles all your source code into object code. Next, all the object code in your project is linked together by a program called a linker to form your application. That linked application is what actually runs on your computer. Take a look at Figure 3-2. This project contains two source code files, one named main.c and another named extras.c, as well as an object file named lib.o. Sometimes, you ll find yourself making use of some code that others have already compiled. Perhaps they want to share their code but do not want to show you their source code. Or, perhaps, you built a library of code that you ll use again and again and don t want to recompile each time you use the code. By precompiling the library into object code and adding the object code into your project, you can save some time. As it turns out, a library called the C standard library comes with Xcode and every other C development environment in the universe. Hmm, I guess that s why they call it standard. The C standard library comes packed with an incredible number of useful programming bits and pieces that we can use in our own programs. We ll talk about those bits and pieces as we make use of them throughout the book.
Figure 3-2. Building your application. First, your source code is compiled, and then your object code is linked. The linked application is ready to run.
CHAPTER 3: Programming Basics
As you can see in Figure 3-2, Xcode starts by compiling main.c and extras.c into object code. Next, all three object files are linked together by the linker into a runnable application. The programs in this book were all designed to run in the console window. As you make your way through the rest of the books in this series, you ll learn how to add the rest of the pieces necessary to create applications that can be run from the Finder. For now, Xcode s console will do just fine.
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