barcode reader for java mobile free download Figure 2-9. Your new project window in Java

Make ECC200 in Java Figure 2-9. Your new project window

Figure 2-9. Your new project window
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Your First Program
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We have just created a new Xcode project. Like all the programs in this book, this project is completely text based there are no buttons, scroll bars, icons, and so on. All the action will happen in a simple scrolling text window known as the console window. Before we take our program for a test run, let s open the console window. Select Console from Xcode s Run menu. A blank console window will appear (see Figure 2-10).
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CHAPTER 2: Go Get the Tools!
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Figure 2-10. The blank console window, before we run our program
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As you can see, the body of the console window is blank. Let s run our program and see what happens. Select Build and Run from the Build menu. If the console window disappears, bring it to the front by again selecting Console from Xcode s Run menu. Our text program puts a time stamp in the console window, telling us exactly when our program started running. It next displays the text Hello, World! followed by an exit status message, and then exits gracefully (see Figure 2-11). We didn t have to do anything to the project to tell the program what to do. When Xcode creates a new C project, this program is what comes right out of the box.
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Figure 2-11. The console window, showing the text produced when we ran our program
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CHAPTER 2: Go Get the Tools!
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We need to do one last thing in this chapter before we can move on: download all the sample projects that go along with this book. You ll find them all on the Apress web site. This URL will take you to the main web page for Learn C on the Mac:
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http://www.apress.com/book/view/9781430218098
In the column on the left side of this web page, you ll see a section called Book Details and, below that, a section called Book Extras. In the Book Extras section, you ll find a link labeled Source Code. Click that link. A file called Learn C Projects.zip will download to your hard drive. Locate the file Learn C Projects.zip in your downloads folder and double-click it. The file will unzip itself and leave you with a new folder named Learn C Projects. That, my friend, contains the keys to the kingdom, the collected projects from the entire book. Drag the folder someplace safe. If you like, once you ve placed Learn C Projects in its new home, you can drag it from its new location to the sidebar in a Finder window to make it a bit easier to get to.
Let s Move On
Well, that s about it for this chapter. You ve accomplished a lot. You ve joined ADC, logged in, downloaded the Xcode installer, installed Xcode, created a new project, and built and run your very first program. Awesome! I d say that calls for a nice, cool beverage of your choice and a well-deserved round of applause. Feel free to quit Xcode if you like. We ll fire it up again in the next chapter. See you there!
Programming Basics
efore we dig into C programming specifics, we ll spend a few minutes discussing the basics of programming: Why write a computer program How do computer programs work We ll answer these questions and look at all of the elements that come together to create a computer program, such as source code, a compiler, and the computer itself. If you ve already done some programming, skim through this chapter. If you feel comfortable with the material, skip ahead to 4. Most of the issues covered in this chapter will be independent of the C language.
Programming
Why write a computer program There are many reasons. Some programs are written in direct response to a problem too complex to solve by hand. For example, you might write a program to calculate the constant to 5,000 decimal places or to determine the precise moment to fire the boosters that will safely land the Mars Rover. Other programs are written as performance aids, allowing you to perform a regular task more efficiently. You might write a program to help you balance your checkbook, keep track of your baseball card collection, or lay out this month s issue of Dinosaur Today. Whatever their purpose, each of these examples shares a common theme. They are all examples of the art of programming. Your goal in reading this book is to learn how to use the C programming language to create programs of your own. Before we get into C, however, let s take a minute to look at some other ways to solve your programming problems.
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