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Visual Basic Example of Nicely Documented Variable Declarations
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Dim cursorX As Integer Dim cursorY As Integer ' horizontal cursor position; ranges from 1..MaxCols ' vertical cursor position; ranges from 1..MaxRows ' length of antenna in meters; range is >= 2 ' strength of signal in kilowatts; range is >= 1 ' ASCII character code; ranges from 0..255 ' size of character in points; ranges from 4..127
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Dim antennaLength As Long Dim signalStrength As Integer Dim characterCode As Integer Dim characterSize As Integer
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Dim characterAttribute As Integer ' 0=Plain; 1=Italic; 2=Bold; 3=BoldItalic
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All the range information is given in comments.
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Comment limitations on input data Input data might come from an input parameter, a file, or direct user input. The guidelines above apply as much to routine-input parameters as to other kinds of data. Make sure that expected and unexpected values are documented. Comments are one way of documenting that a routine is never supposed to receive certain data. Assertions are another way to document valid ranges, and if you use them the code becomes that much more self-checking.
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32. Self-Documenting Code
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8 CROSS-REFERENCE
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Document flags to the bit level If a variable is used as a bit field, document the meaning of each bit, as in the next example.
Visual Basic Example of Documenting Flags to the Bit Level
' The meanings of the bits in StatusFlags are as follows: ' MSB ' ' ' ' ' ' LSB 0 1-2 3 4 ... 14 not used (should be 0) 15-32 not used (should be 0) error detected: 1=yes, 0=no kind of error: 0=syntax, 1=warning, 2=severe, 3=fatal reserved (should be 0) printer status: 1=ready, 0=not ready
For details on naming flag 0 variables, see "Naming Status 1 Variables" in Section 11.2.
Dim StatusFlags As Integer
If the example were written in C++, it would call for bit-field syntax so that the bit-field meanings would be self-documenting.
Stamp comments related to a variable with the variable s name If you have comments that refer to a specific variable, make sure that the comment is updated whenever the variable is updated. One way to improve the odds of a consistent modification is to stamp the comment with the name of the variable. That way, string searches for the variable name will find the comment as well as the variable. Document global data If global data is used, annotate each piece well at the point at which it is declared. The annotation should indicate the purpose of the data and why it needs to be global. At each point at which the data is used, make it clear that the data is global. A naming convention is the first choice for highlighting a variable s global status. If a naming convention isn t used, comments can fill the gap.
For details on using global data, 8 see Section 13.3, "Global 9 Data."
7 CROSS-REFERENCE
Commenting Control Structures
For other details on control structures, see Section 31.3, Layout Styles, Section 31.4, Laying Out Control Structures, and s 14 through 19.
Purpose of the following loop
5 CROSS-REFERENCE
The space before a control structure is usually a natural place to put a comment. If it s an if or a case statement, you can provide the reason for the decision and a summary of the outcome. If it s a loop, you can indicate the purpose of the loop. Here are a couple of examples:
C++ Example of Commenting the Purpose of a Control Structure
// copy input field up to comma while ( ( *inputString != ',' ) && ( *inputString != END_OF_STRING ) ) { *field = *inputString; field++;
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32. Self-Documenting Code
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4 End of the loop (useful for longer, nested loops although the need for such a comment indicates overly complicated code) Purpose of the conditional Purpose of the loop. Position of comment makes it clear
inputString++; } // while -- copy input field *field = END_OF_STRING; // if at end of string, all actions are complete if ( *inputString != END_OF_STRING ) { // read past comma and subsequent blanks to get to the next input field inputString++; while ( ( *inputString == ' ' ) && ( *inputString != END_OF_STRING ) ) { inputString++; } } // if -- at end of string
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