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23. Debugging
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7 CROSS-REFERENCE
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For details on the relationship between quality and cost, see Section 20.5, The General Principle of Software Quality.
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In addition to providing insight into debugging, the evidence supports the General Principle of Software Quality: Improving quality reduces development costs. The best programmers found the most defects, found the defects most quickly, and made correct modifications most often. You don t have to choose between quality, cost, and time they all go hand in hand.
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Defects as Opportunities
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What does having an defect mean Assuming that you don t want the program to have defect, it means that you don t fully understand what the program does. The idea of not understanding what the program does is unsettling. After all, if you created the program, it should do your bidding. If you don t know exactly what you re telling the computer to do, that s only a small step from merely trying different things until something seems to work that is, programming by trial and error. If you re programming by trial and error, defects are guaranteed. You don t need to learn how to fix defects; you need to learn how to avoid them in the first place. Most people are somewhat fallible, however, and you might be an excellent programmer who has simply made a modest oversight. If this is the case, an error in your program represents a powerful opportunity. You can:
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Learn about the program you re working on You have something to learn about the program because if you already knew it perfectly, it wouldn t have a defect. You would have corrected it already. Learn about the kind of mistakes you make If you wrote the program, you inserted the defect. It s not every day that a spotlight exposes a weakness with glaring clarity, but this particular day you have an opportunity to learn about your mistakes. Once you find the mistake, ask why did you make it How could you have found it more quickly How could you have prevented it Does the code have other mistakes just like it Can you correct them before they cause problems of their own Learn about the quality of your code from the point of view of someone who has to read it You ll have to read your code to find the defect. This is an opportunity to look critically at the quality of your code. Is it easy to read How could it be better Use your discoveries to refactor your current code or to improve the code you write next. Learn about how you solve problems Does your approach to solving debugging problems give you confidence Does your approach work Do you find defects quickly Or is your approach to debugging weak Do you feel anguish and frustration Do you guess randomly
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9 FURTHER READING For
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0 details on practices that will
help you learn about the kinds of errors you are 2 personally prone to, see A 3 Discipline for Software 4 Engineering (Humphrey 1995).
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23. Debugging
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Do you need to improve Considering the amount of time many projects spend on debugging, you definitely won t waste time if you observe how you debug. Taking time to analyze and change the way you debug might be the quickest way to decrease the total amount of time it takes you to develop a program.
Learn about how you fix defects In addition to learning how you find defects, you can learn about how you fix them. Do you make the easiest possible correction, by applying goto Band-Aids and special-case makeup that changes the symptom but not the problem Or do you make systemic corrections, demanding an accurate diagnosis and prescribing treatment for the heart of the problem
All things considered, debugging is an extraordinarily rich soil in which to plant the seeds of your own improvement. It s where all construction roads cross: readability, design, code quality you name it. This is where building good code pays off especially if you do it well enough that you don t have to debug very often.
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