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Creating European Article Number 13 in Visual C# The plus sign (+) signals that the statement isn t complete.

3 The plus sign (+) signals that the statement isn t complete.
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7 The comma (,) signals that the statement isn t complete.
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In addition to telling the reader that the statement isn t complete on the first line, the break helps prevent incorrect modifications. If the continuation of the statement were deleted, the first line wouldn t look as if you had merely forgotten a parenthesis or semicolon it would clearly need something more.
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Keep closely related elements together When you break a line, keep things together that belong together array references, arguments to a routine, and so on. The example shown in Listing 31-38is poor form:
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Listing 31-38. Java example of breaking a line poorly.
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customerBill = PreviousBalance( paymentHistory[ customerID ] ) + LateCharge( paymentHistory[ customerID ] );
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Admittedly, this line break follows the guideline of making the incompleteness of the statement obvious, but it does so in a way that makes the statement unnecessarily hard to read. You might find a case in which the break is necessary, but in this case it isn t. It s better to keep the array references all on one line. Listing 31-39 shows better formatting:
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Listing 31-39. Java example of breaking a line well.
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customerBill = PreviousBalance( paymentHistory[ customerID ] ) + LateCharge( paymentHistory[ customerID ] );
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Indent routine-call continuation lines the standard amount If you normally indent three spaces for statements in a loop or a conditional, indent the continuation lines for a routine by three spaces. Some examples are shown in Listing 31-40:
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31. Layout and Style
Page 29
Listing 31-40. Java examples of indenting routine-call continuation lines using the standard indentation increment.
DrawLine( window.north, window.south, window.east, window.west, currentWidth, currentAttribute ); SetFontAttributes( faceName[ fontId ], size[ fontId ], bold[ fontId ], italic[ fontId ], syntheticAttribute[ fontId ].underline, syntheticAttribute[ fontId ].strikeout );
One alternative to this approach is to line up the continuation lines under the first argument to the routine, as shown in Listing 31-41:
Listing 31-41. Java examples of indenting a routine-call continuation line to emphasize routine names.
DrawLine( window.north, window.south, window.east, window.west, currentWidth, currentAttribute ); SetFontAttributes( faceName[ fontId ], size[ fontId ], bold[ fontId ], italic[ fontId ], syntheticAttribute[ fontId ].underline, syntheticAttribute[ fontId ].strikeout );
From an aesthetic point of view, this looks a little ragged compared to the first approach. It is also difficult to maintain as routine names changes, argument names change, and so on. Most programmers tend to gravitate toward the first style over time.
Make it easy to find the end of a continuation line One problem with the approach shown above is that you can t easily find the end of each line. Another alternative is to put each argument on a line of its own and indicate the end of the group with a closing parenthesis. Listing 31-42 shows how it looks.
Listing 31-42. Java examples of formatting routine-call continuation lines one argument to a line.
DrawLine( window.north, window.south, window.east, window.west, currentWidth, currentAttribute ); SetFontAttributes( faceName[ fontId ], size[ fontId ], bold[ fontId ], italic[ fontId ], syntheticAttribute[ fontId ].underline, syntheticAttribute[ fontId ].strikeout
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31. Layout and Style
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This approach takes up a lot of real estate. If the arguments to a routine are long object-field references or pointer names, however, as the last two are, using one argument per line improves readability substantially. The ); at the end of the block makes the end of the call clear. You also don t have to reformat when you add a parameter; you just add a new line. In practice, usually only a few routines need to be broken into multiple lines. You can handle others on one line. Any of the three options for formatting multiple-line routine calls works all right if you use it consistently.
Indent control-statement continuation lines the standard amount If you run out of room for a for loop, a while loop, or an if statement, indent the continuation line by the same amount of space that you indent statements in a loop or after an if statement. Two examples are shown in Listing 31-43:
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