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23. Debugging
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different part), or get a different error (because you ll have tricked the compiler into producing a message that makes more sense).
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Man y programming text editors can automatically find matching braces or begin-end pairs. For details on programming editors, see Editing in Section 30.2.
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1 CROSS-REFERENCE
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Find extra comments and quotation marks If your code is tripping up the compiler because it contains an extra quotation mark or beginning comment somewhere, insert the following sequence systematically into your code to help locate the defect:
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C/C++/Java /*"/**/
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23.3 Fixing a Defect
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The hard part is finding the defect. Fixing the defect is the easy part. But as with many easy tasks, the fact that it s easy makes it especially error-prone. At least one study found that defect corrections have more than a 50 percent chance of being wrong the first time (Yourdon 1986b). Here are a few guidelines for reducing the chance of error:
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2 KEY POINT
Understand the problem before you fix it The Devil s Guide to Debugging is right: The best way to make your life difficult and corrode the quality of your program is to fix problems without really understanding them. Before you fix a problem, make sure you understand it to the core. Triangulate the defect both with cases that should reproduce the error and with cases that shouldn t reproduce the error. Keep at it until you understand the problem well enough to predict its occurrence correctly every time. Understand the program, not just the problem If you understand the context in which a problem occurs, you re more likely to solve the problem completely rather than only one aspect of it. A study done with short programs found that programmers who achieve a global understanding of program behavior have a better chance of modifying it successfully than programmers who focus on local behavior, learning about the program only as they need to (Littman et al. 1986). Because the program in this study was small (280 lines), it doesn t prove that you should try to understand a 50,000-line program completely before you fix a defect. It does suggest that you should understand at least the code in the vicinity of the defect correction the vicinity being not a few lines but a few hundred. Confirm the defect diagnosis Before you rush to fix a defect, make sure that you ve diagnosed the problem correctly. Take the time to run test cases that prove your hypothesis and disprove competing hypotheses. If you ve proven only that the error could be the result of
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23. Debugging
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one of several causes, you don t yet have enough evidence to work on the one cause; rule out the others first.
Relax A programmer was ready for a ski trip. His product was ready to ship, he was already late, and he had only one more defect to correct. He changed the source file and checked it into version control. He didn t recompile the program and didn t verify that the change was correct.
Never debug standing up. Gerald Weinberg
In fact, the change was not correct, and his manager was outraged. How could he change code in a product that was ready to ship without checking it What could be worse Isn t this the pinnacle of professional recklessness If this isn t the height of recklessness, it s close, and it s common. Hurrying to solve a problem is one of the most time-ineffective things you can do. It leads to rushed judgments, incomplete defect diagnosis, and incomplete corrections. Wishful thinking can lead you to see solutions where there are none. The pressure often self-imposed encourages haphazard trial-and-error solutions, sometimes assuming that a solution works without verifying that it does. In striking contrast, during the final days of Microsoft Windows 2000 development, a developer needed to fix a defect that was the last remaining defect before a Release Candidate could be created. The developer changed the code, checked his fix, and tested his fix on his local build. But he didn t check the fix into version control at that point. Instead, he went to play basketball. He said, I m feeling too stressed right now to be sure that I ve considered everything I should consider. I m going to clear my mind for an hour, and then I ll come back and check in the code once I ve convinced myself that the fix is really correct. Relax long enough to make sure your solution is right. Don t be tempted to take shortcuts. It might take more time, but it ll probably take less. If nothing else, you ll fix the problem correctly and your manager won t call you back from your ski trip.
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