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23. Debugging
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For details on automated 6 regression testing, see 7 Retesting (Regression 8 Testing) in Section 22.6.
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5 CROSS-REFERENCE
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Check your fix Check the program yourself, have someone else check it for you, or walk through it with someone else. Run the same triangulation test cases you used to diagnose the problem to make sure that all aspects of the problem have been resolved. If you ve solved only part of the problem, you ll find out that you still have work to do.
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Rerun the whole program to check for side effects of your changes. The easiest and most effective way to check for side effects is to run the program through an automated suite of regression tests in JUnit, CppUnit, or equivalent.
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Look for similar defects When you find one defect, look for others that are similar. Defects tend to occur in groups, and one of the values of paying attention to the kinds of defects you make is that you can correct all the defects of that kind. Looking for similar defects requires you to have a thorough understanding of the problem. Watch for the warning sign: If you can t figure out how to look for similar defects, that s a sign that you don t yet completely understand the problem.
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23.4 Psychological Considerations in Debugging
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Debugging is as intellectually demanding as any other software-development activity. Your ego tells you that your code is good and doesn t have a defect even when you have seen that it has one. You have to think precisely forming hypotheses, collecting data, analyzing hypotheses, and methodically rejecting them with a formality that s unnatural to many people. If you re both building code and debugging it, you have to switch quickly between the fluid, creative thinking that goes with design and the rigidly critical thinking that goes with debugging. As you read your code, you have to battle the code s familiarity and guard against seeing what you expect to see.
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3 FURTHER READING For an
4 excellent discussion of
psychological issues in debugging, as well as many other areas of software development, see The Psychology of Computer Programming (Weinberg 1998).
How Psychological Set Contributes to Debugging Blindness
When you see a token in a program that says Num, what do you see Do you see a misspelling of the word Numb Or do you see the abbreviation for Number Most likely, you see the abbreviation for Number. This is the phenomenon of psychological set seeing what you expect to see. What does this sign say
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23. Debugging
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In this classic puzzle, people often see only one the. People see what they expect to see. Consider the following: Students learning while loops often expect a loop to be continuously evaluated; that is, they expect the loop to terminate as soon as the while condition becomes false, rather than only at the top or bottom (Curtis et al. 1986). They expect a while loop to act as while does in natural language. A programmer who unintentionally used both the variable SYSTSTS and the variable SYSSTSTS thought he was using a single variable. He didn t discover the problem until the program had been run hundreds of times, and a book was written containing the erroneous results (Weinberg 1998). A programmer looking at code like this code:
if ( x < y ) swap = x x = y y = swap
7 HARD DATA
sometimes sees code like this code:
if ( x < y ) { swap = x x = y y swap }
People expect a new phenomenon to resemble similar phenomena they ve seen before. They expect a new control construct to work the same as old constructs; programming-langauge while statements to work the same as real-life while statements; and variable names to be the same as they ve been before. You see what you expect to see and thus overlook differences, like the misspelling of the word language in the previous sentence. What does psychological set have to do with debugging First, it speaks to the importance of good programming practices. Good formatting, commenting, variable names, routine names, and other elements of programming style help structure the programming background so that likely defects appear as variations and stand out.
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