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31. Layout and Style
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If you have a case statement in which all the cases are exactly parallel and all the actions are short, you could consider putting the case and action on the same line. In most instances, however, you ll live to regret it. The formatting is a pain initially and breaks under modification, and it s hard to keep the structure of all the cases parallel as some of the short actions become longer ones.
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31.5 Laying Out Individual Statements
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This section explains many ways to improve individual statements in a program.
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For details on documenting individual statements, see 8 Commenting Individual Lines in Section 32.5.
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Statement Length
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A common rule is to limit statement line length to 80 characters. Here are the reasons: Lines longer than 80 characters are hard to read. The 80-character limitation discourages deep nesting. Lines longer than 80 characters often won t fit on 8.5 x 11 paper. Paper larger than 8.5 x 11 is hard to file.
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With larger screens, narrow typefaces, laser printers, and landscape mode, the arguments for the 80-character limit aren t as compelling as they used to be. A single 90-character-long line is usually more readable than one that has been broken in two just to avoid spilling over the 80th column. With modern technology, it s probably all right to exceed 80 columns occasionally.
Using Spaces for Clarity
Add white space within a statement for the sake of readability:
Use spaces to make logical expressions readable The expression
while(pathName[startPath+position]<>';') and ((startPath+position)<length(pathName)) do
is about as readable as Idareyoutoreadthis. As a rule, you should separate identifiers from other identifiers with spaces. If you use this rule, the while expression looks like this:
while ( pathName[ startPath+position ] <> ';' ) and (( startPath + position ) < length( pathName )) do
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Some software artists might recommend enhancing this particular expression with additional spaces to emphasize its logical structure, this way:
while ( pathName[ startPath + position ] <> ';' ) and ( ( startPath + position ) < length( pathName ) ) do
This is fine, although the first use of spaces was sufficient to ensure readability. Extra spaces hardly ever hurt, however, so be generous with them.
Use spaces to make array references readable The expression
grossRate[census[groupId].gender,census[groupId].ageGroup]
is no more readable than the earlier dense while expression. Use spaces around each index in the array to make the indexes readable. If you use this rule, the expression looks like this:
grossRate[ census[ groupId ].gender, census[ groupId ].ageGroup ]
Use spaces to make routine arguments readable What is the fourth argument to the following routine
ReadEmployeeData(maxEmps,empData,inputFile,empCount,inputError);
Now, what is the fourth argument to the following routine
GetCensus( inputFile, empCount, empData, maxEmps, inputError );
Which one was easier to find This is a realistic, worthwhile question because argument positions are significant in all major procedural languages. It s common to have a routine specification on one half of your screen and the call to the routine on the other half, and to compare each formal parameter with each actual parameter.
Formatting Continuation Lines
One of the most vexing problems of program layout is deciding what to do with the part of a statement that spills over to the next line. Do you indent it by the normal indentation amount Do you align it under the keyword What about assignments Here s a sensible, consistent approach that s particularly useful in Java, C, C++, Visual Basic, and other languages that encourage long variable names.
Make the incompleteness of a statement obvi ous Sometimes a statement must be broken across lines, either because it s longer than programming standards allow or because it s too absurdly long to put on one line. Make it obvious that the part of the statement on the first line is only
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part of a statement. The easiest way to do that is to break up the statement so that the part on the first line is blatantly incorrect syntactically if it stands alone. Some examples are shown in Listing 31-37:
Listing 31-37. Java examples of obviously incomplete statements.
The && signals that the statement isn t complete.
while ( pathName[ startPath + position ] != ';' ) && ( ( startPath + position ) <= pathName.length() ) ... totalBill = totalBill + customerPurchases[ customerID ] + SalesTax( customerPurchases[ customerID ] ); ... DrawLine( window.north, window.south, window.east, window.west, currentWidth, currentAttribute ); ...
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