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General Guidelines for File Documentation
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At the top of a file, use a block comment to describe the contents of the file. Here are some guidelines for the block comment:
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Describe the purpose and contents of each file The file header comment should describe the classes or routines contained in a file. If all the routines for a program are in one file, the purpose of the file is pretty obvious it s the file that contains the whole program. If the purpose of the file is to contain one specific class, the purpose is also pretty obvious it s the file that contains the class with a similar name.
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If the file contains more than one class, explain why the classes need to be combined into a single file.
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32. Self-Documenting Code
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If the division into multiple source files is made for some reason other than modularity, a good description of the purpose of the file will be even more helpful to a programmer who is modifying the program. If someone is looking for a routine that does x, does the file s header comment help that person determine whether this file contains such a routine
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Put your name, email address, and phone number in the block comment Authorship and primary responsibility for specific areas of source code becomes important on large projects. Small projects (less than 10 people) can use collaborative development approaches such as shared code ownership in which all team members are equally responsible for all sections of code. Larger systems require that programmers specialize in different areas of code, which makes fullteam-wide shared code ownership impractical.
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In that case, authorship is important information to have in a listing. It gives other programmers who work on the code a clue about the programming style, and it gives them someone to contact if they need help. Depending on whether you work on individual routines, classes, or programs, you should include author information at the routine, class, or program level.
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Include a copyright statement in the block comment Many companies like to include copyright statements in their programs. If yours is one of them, include a line similar to this one:
Java Example of a Copyright Statement
// (c) Copyright 1993-2004 Steven C. McConnell. All Rights Reserved. ...
(You would typically use your company s name rather than your name.)
Give the file a name related to its contents Normally, the name of the file should be closely related to the name of the public class contained in the file. For example, if the class is named Employee, the file should be named Employee.cpp.
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32. Self-Documenting Code
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The Book Paradigm for Program Documentation
Most experienced programmers agree that the documentation techniques described in the previous section are valuable. The hard, scientific evidence for the value of any one of the techniques is still weak. When the techniques are combined, however, evidence of their effectiveness is strong. In 1990, Paul Oman and Curtis Cook published a pair of studies on the Book Paradigm for documentation (1990a, 1990b). They looked for a coding style that would support several different styles of code reading. One goal was to support top-down, bottom-up, and focused searches. Another was to break up the code into chunks that programmers could remember more easily than a long listing of homogeneous code. Oman and Cook wanted the style to provide for both high-level and low-level clues about code organization. They found that by thinking of code as a special kind of book and formatting it accordingly, they could achieve their goals. In the Book Paradigm, code and its documentation are organized into several components similar to the components of a book to help programmers get a high-level view of the program. The preface is a group of introductory comments such as those usually found at the beginning of a file. It functions as the preface to a book does. It gives the programmer an overview of the program. The table of contents shows the files, classes, and routines (chapters). They might be shown in a list, as a traditional book s chapters are, or graphically, in a structure chart. The sections are the divisions within routines routine declarations, data declarations, and executable statements, for example. The cross-references are cross-reference maps of the code, including line numbers. The low-level techniques that Oman and Cook use to take advantage of the similarities between a book and a code listing are similar to the techniques described in 31, "Layout and Style," and in this chapter. The upshot of using their techniques to organize code was that when Oman and Cook gave a maintenance task to a group of experienced, professional programmers, the average time to perform a maintenance task in a 1000-line program was only about three-quarters of the time it took the programmers to do the same task in a traditional source listing (1990b). Moreover, the maintenance scores of programmers on code documented with the Book Paradigm averaged about 20 percent higher than on traditionally documented code. Oman and Cook
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