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9 9 CHAPTER
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Mistakes happen. It s a simple fact of life, and it s true in programming, too. Even the most experienced programmers make mistakes, sometimes the same mistakes over and over. You ve probably made a few as you ve gone through the exercises in this book. Mistakes are normal, and they are easy to make, especially in a programming language such as C#; we even have a special word for programming mistakes: bugs. You ve probably noticed that the compiler (that s Visual Studio or C# Express) catches a lot of your bugs, and tells you what s wrong. It s even right a lot of the time, although it s certainly not perfect. The more you learn, and the more you have the basics of the language down, the more complicated your mistakes become. Staring at the code and puzzling it out isn t an effective way to find bugs anymore. For that, you need a debugger. Fortunately, Visual Studio (including C# Express) comes with a great debugger built right in. The debugger is your friend. There is simply no tool more powerful than a debugger for learning C# and for writing quality C# programs. Put simply, the debugger is a tool that helps you understand what is really going on when your program is running. It is the X-ray of software development, allowing you to see inside programs and diagnose potential problems. Without a debugger, you are guessing; with a debugger, you are seeing. It is as simple as that. Whatever time you invest in learning to use your debugger is time well spent. The debugger is also a powerful tool for understanding code written by others. By putting someone else s code into the debugger and stepping through it, you can see exactly how the methods work and what data they manipulate. The Visual Studio debugger provides a number of windows for watching and interacting with your program while it executes. Getting comfortable with the debugger can mean the difference between finding bugs quickly and struggling for hours or days. Now that you re programming with classes, and execution that jumps around to different methods, it s an appropriate time to take a break from learning the
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specifics of the language and to learn some debugging techniques that will help reduce your frustration later on.
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Debugging is one of the very few areas where Visual Studio 2008 and C# Express differ dramatically. The full Visual Studio offers several windows and options that just aren t available in C# Express. Most of the basic functionality is in both versions, but Visual Studio makes it easier to get to, and has some extra bells and whistles. We ll tell you whenever there s a difference between the products.
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To get started with the debugger, return to Example 8-1 in 8. You ll be putting a breakpoint on the first line of Main( ) to see how this code actually works. A breakpoint is an instruction to the debugger to stop running. You set a breakpoint, run the program, and the debugger runs the program up until the breakpoint. Then you have the opportunity to examine the value of your variables at this point in the execution. Examining your program as it runs can help you untangle otherwise impenetrable problems. You ll often set multiple breakpoints, which allows you to skip through your program, examining the state of your object at selected locations. You can set a breakpoint in many different ways. The easiest is to click in the left margin of the code window. This causes a red dot to appear in the margin next to the relevant line of code, which is also highlighted in red, as shown in Figure 9-1 (although you can t see the color in the book). Open Example 8-1 from 8, if you haven t already, and click in the gray margin next to the first line of Main( ) (Tester t = new Tester( )). Notice that as you hover over the breakpoint, a tool tip tells you the line on which the breakpoint appears. You are now ready to run the program to the breakpoint. To do so, you must be sure to run in debug mode, which you can do by clicking the Start button ( ) or by choosing the Start Debugging item from the Debug menu. In any case, the program starts and runs to the breakpoint, as shown in Figure 9-2.
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Up until now, we ve encouraged you to select Start Without Debugging so that your console window won t vanish on you. If you want to use the debugger, though, you ll need to start with debugging, obviously. Any breakpoint you set will keep your console window from vanishing.
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The first thing to notice is that the program has stopped execution just before executing the statement with the breakpoint. In this case, that means the Tester object t hasn t yet been created. Your console window is open, but blank, because your program hasn t done anything yet. You ll also notice that the red breakpoint symbol
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