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Is each control statement commented Are the ends of long or complex control structures commented or, when possible, simplified so that they don t need comments
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Is the purpose of each routine commented Are other facts about each routine given in comments, when relevant, including input and output data, interface assumptions, limitations, error corrections, global effects, and sources of algorithms
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Does the program have a short document such as that described in the Book Paradigm that gives an overall view of how the program is organized Is the purpose of each file described Are the author s name, email address, and phone number in the listing
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The question of whether to comment is a legitimate one. Done poorly, commenting is a waste of time and sometimes harmful. Done well, commenting is worthwhile. The source code should contain most of the critical information about the program. As long as the program is running, the source code is more likely than any other resource to be kept current, and it s useful to have important information bundled with the code. Good code is its own best documentation. If the code is bad enough to require extensive comments, try first to improve the code so that it doesn t need extensive comments.
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32. Self-Documenting Code
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Page 44
Comments should say things about the code that the code can t say about itself at the summary level or the intent level. Some commenting styles require a lot of tedious clerical work. Develop a style that s easy to maintain.
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33. Personal Character
Page 1
Personal Character
Contents 33.1 Isn t Personal Character Off the Topic
33.2 Intelligence and Humility 33.3 Curiosity 33.4 Intellectual Honesty 33.5 Communication and Cooperation 33.6 Creativity and Discipline 33.7 Laziness 33.8 Characteristics That Don t Matter As Much As You Might Think 33.9 Habits
3 CC2E.COM/ 3313
Related Topics Themes in software craftsmanship: 34
Complexity: Sections 5.2 and 19.6 PERSONAL CHARACTER HAS RECEIVED A RARE DEGREE of attention in software development. Ever since Edsger Dijkstra s landmark 1965 article Programming Considered as a Human Activity, programmer character has been regarded as a legitimate and fruitful area of inquiry. Although titles such as The Psychology of Bridge Construction and Exploratory Experiments in Attorney Behavior might seem absurd, in the computer field The Psychology of Computer Programming, Exploratory Experiments in Programmer Behavior, and similar titles are classics. Engineers in every discipline learn the limits of the tools and materials they work with. If you re an electrical engineer, you know the conductivity of various metals and a hundred ways to use a voltmeter. If you re a structural engineer, you know the load-bearing properties of wood, concrete, and steel. If you re a software engineer, your basic building material is human intellect and your primary tool is you. Rather than designing a structure to the last detail and then handing the blueprints to someone else for construction, you know that once you ve designed a piece of software to the last detail, it s done. The whole job of
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33. Personal Character
Page 2
programming is building air castles it s one of the most purely mental activities you can do. Consequently, when software engineers study the essential properties of their tools and raw materials, they find that they re studying people intellect, character, and other attributes that are less tangible than wood, concrete, and steel. If you re looking for concrete programming tips, this chapter might seem too abstract to be useful. Once you ve absorbed the specific advice in the rest of the book, however, this chapter spells out what you need to do to continue improving. Read the next section, and then decide whether you want to skip the chapter.
33.1 Isn t Personal Character Off the Topic
The intense inwardness of programming makes personal character especially important. You know how difficult it is to put in eight concentrated hours in one day. You ve probably had the experience of being burned out one day from concentrating too hard the day before, or burned out one month from concentrating too hard the month before. You ve probably had days on which you ve worked well from 8:00 A.M. to 2:00 P.M. and then felt like quitting. You didn t quit, though; you pushed on from 2:00 P.M. to 5:00 P.M. and then spent the rest of the week fixing what you wrote from 2:00 to 5:00. Programming work is essentially unsupervisable because no one ever really knows what you re working on. We ve all had projects in which we spent 80 percent of the time working on a small piece we found interesting and 20 percent of the time building the other 80 percent of the program. Your employer can t force you to be a good programmer; a lot of times your employer isn t even in a position to judge whether you re good. If you want to be great, you re responsible for making yourself great. It s a matter of your personal character. Once you decide to make yourself a superior programmer, the potential for improvement is huge. Study after study has found differences on the order of 10 to 1 in the time required to create a program. They have also found differences on the order of 10 to 1 in the time required to debug a program and 10 to 1 in the resulting size, speed, error rate, and number of errors detected (Sackman, Erikson, and Grant 1968; Curtis 1981; Mills 1983; DeMarco and Lister 1985; Curtis et al. 1986; Card 1987; Valett and McGarry 1989).
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