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This example suggests some guidelines.
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Put a comment before each block of statements, if, case, or loop Such a place is a natural spot for a comment, and these constructs often need explanation. Use a comment to clarify the purpose of the control structure. Comment the end of each control structure Use a comment to show what ended for example,
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} // for clientIndex process record for each client
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A comment is especially helpful at the end of long or nested loops. Use comments to clarify loop nesting. Here s a Java example of using comments to clarify the ends of loop structures:
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Java Example of Using Comments to Show Nesting
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for ( tableIndex = 0; tableIndex < tableCount; tableIndex++ ) { while ( recordIndex < recordCount ) { if ( !IllegalRecordNumber( recordIndex ) ) { ... } // if } // while } // for
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1 These comments indicate which control structure is ending.
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This commenting technique supplements the visual clues about the logical structure given by the code s indentation. You don t need to use the technique for short loops that aren t nested. When the nesting is deep or the loops are long, however, the technique pays off.
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Treat end-of-loop comments as a warning indicating complicated code If a loop is complicated enough to need an end-of-loop comment, treat the comment as a warning sign: the loop might need to be simplified. The same rule applies to complicated if tests and case statements.
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de Complete
32. Self-Documenting Code
Page 31
End-of-loop comments provide useful clues to logical structure, but writing them initially and then maintaining them can become tedious. The best way to avoid such tedious work is often to rewrite any code that s complicated enough to require tedious documentation.
Commenting Routines
8 CROSS-REFERENCE
9 details on formatting
routines, see Section 31.7, Laying Out Routines. For 1 details on how to create highquality routines, see CODING HORROR 2 7, High-Quality Routines.
Routine-level comments are the subject of some of the worst advice in typical computer-science textbooks. Many textbooks urge you to pile up a stack of information at the top of every routine, regardless of its size or complexity. Here s an example:
Visual Basic Example of a Monolithic, Kitchen-Sink Routine Prolog
'********************************************************************** ' Name: CopyString ' ' Purpose: ' ' ' Algorithm: ' ' ' ' ' ' Inputs: ' ' Outputs: ' ' Interface Assumptions: None ' ' Modification History: None ' ' Author: ' Phone: ' SSN: ' Eye Color: ' Maiden Name: ' Blood Type: Dwight K. Coder (555) 222-2255 111-22-3333 Green None AB' Date Created: 10/1/04 output The string to receive the copy of "input" input The string to be copied It gets the length of "source" and then copies each character, one at a time, into "target". It uses the loop index as an array index into both "source" and "target" and increments the loop/array index after each character is copied. This routine copies a string from the source string (source) to the target string (target).
' Mother's Maiden Name: None ' Favorite Car: Pontiac Aztek ' Personalized License Plate: "Tek-ie" '**********************************************************************
de Complete
32. Self-Documenting Code
Page 32
This is ridiculous. CopyString is presumably a trivial routine probably fewer than five lines of code. The comment is totally out of proportion to the scale of the routine. The parts about the routine s Purpose and Algorithm are strained because it s hard to describe something as simple as CopyString at a level of detail that s between copy a string and the code itself. The boiler-plate comments Interface Assumptions and Modification History aren t useful either they just take up space in the listing. Requiring the author s name is redundant with information that can be retrieved more accurately from the revision control system. To require all these ingredients for every routine is a recipe for inaccurate comments and maintenance failure. It s a lot of make-work that never pays off. Another problem with heavy routine headers is that they discourage good factoring of the code the overhead to create a new routine is so high that programmers will tend to err on the side of creating fewer routines, not more. Coding conventions should encourage good practices; heavy routine headers do the opposite. Here are some guidelines for commenting routines:
Keep comments close to the code they describe One reason that the prolog to a routine shouldn t contain voluminous documentation is that such a practice puts the comments far away from the parts of the routine they describe. During maintenance, comments that are far from the code tend not to be maintained with the code. The comments and the code start to disagree, and suddenly the comments are worthless.
Instead, follow the Principle of Proximity and put comments as close as possible to the code they describe. They re more likely to be maintained, and they ll continue to be worthwhile. Several components of routine prologs are described below and should be included as needed. For your convenience, create a boilerplate documentation prolog. Just don t feel obliged to include all the information in every case. Fill out the parts that matter and delete the rest.
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