c# generating barcode Java examples of indenting control-statement continuation lines. in C#

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Listing 31-43. Java examples of indenting control-statement continuation lines.
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while ( ( pathName[ startPath + position ] != ';' ) &&
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2 This continuation line is of spaces...
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( ( startPath + position ) <= pathName.length() ) ) { ... } for ( int employeeNum = employee.first + employee.offset;
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4 indented the standard number
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employeeNum < employee.first + employee.offset + employee.total; employeeNum++ ) { ... }
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7 ...as is this one.
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Som etimes the best solution to a complicated test is to put it into a boolean function. For examples, see Making Complicated Expressions Simple in Section 19.1.
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This meets the criteria set earlier in the chapter. The continuation part of the statement is done logically it s always indented underneath the statement it continues. The indentation can be done consistently it uses only a few more spaces than the original line. It s as readable as anything else, and it s as maintainable as anything else. In some cases you might be able to improve readability by fine-tuning the indentation or spacing, but be sure to keep the maintainability trade-off in mind when you consider fine-tuning.
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Do not align right sides of assignment statements In the first edition of this book I recommended aligning the right sides of statements containing assignments as shown in Listing 31-44:
Listing 31-44. Java example of endline layout used for assignmentstatement continuation bad practice.
customerPurchases = customerPurchases + CustomerSales( CustomerID ); customerBill = customerBill + customerPurchases; totalCustomerBill = customerBill + PreviousBalance( customerID ) +
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31. Layout and Style
Page 31
customerRating
LateCharge( customerID ); = Rating( customerID, totalCustomerBill );
With the benefit of 10 years hindsight, I have found that while this indentation style might look attractive it becomes a headache to maintain the alignment of the equals signs as variable names change, code is run through tools that substitute tabs for spaces and spaces for tabs. It is also hard to maintain as lines are moved among different parts of the program that have different levels of indentation. For consistency with the other indentation guidelines as well as maintainability, treat groups of statements containing assignment operations just as you would treat other statements, as Listing 31-45 shows:
Listing 31-45. Java example of standard indentation for assignmentstatement continuation good practice.
customerPurchases = customerPurchases + CustomerSales( CustomerID ); customerBill = customerBill + customerPurchases; totalCustomerBill = customerBill + PreviousBalance( customerID ) + LateCharge( customerID ); customerRating = Rating( customerID, totalCustomerBill );
Indent assignment-statement continuation lines the standard amount In Listing 31-45, the continuation line for the third assignment statement is indented the standard amount. This is done for the same reasons that assignment statements in general are not formatted in any special way general readability and maintainability.
Using Only One Statement per Line
Modern languages such as C++ and Java allow multiple statements per line. The power of free formatting is a mixed blessing, however, when it comes to putting multiple statements on a line:
i = 0; j = 0; k = 0; DestroyBadLoopNames( i, j, k );
This line contains several statements that could logically be separated onto lines of their own. One argument in favor of putting several statements on one line is that it requires fewer lines of screen space or printer paper, which allows more of the code to be viewed at once. It s also a way to group related statements, and some programmers believe that it provides optimization clues to the compiler. These are good reasons, but the reasons to limit yourself to one statement per line are more compelling:
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31. Layout and Style
Page 32
Putting each statement on a line of its own provides an accurate view of a program s complexity. It doesn t hide complexity by making complex statements look trivial. Statements that are complex look complex. Statements that are easy look easy. Putting several statements on one line doesn t provide optimization clues to modern compilers. Today s optimizing compilers don t depend on formatting clues to do their optimizations. This is illustrated later in this section. With statements on their own lines, the code reads from top to bottom, instead of top to bottom and left to right. When you re looking for a specific line of code, your eye should be able to follow the left margin of the code. It shouldn t have to dip into each and every line just because a single line might contain two statements. With statements on their own lines, it s easy to find syntax errors when your compiler provides only the line numbers of the errors. If you have multiple statements on a line, the line number doesn t tell you which statement is in error. With one statement to a line, it s easy to step through the code with lineoriented debuggers. If you have several statements on a line, the debugger executes them all at once, and you have to switch to assembler to step through individual statements. With one to a line, it s easy to edit individual statements to delete a line or temporarily convert a line to a comment. If you have multiple statements on a line, you have to do your editing between other statements.
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