c# ean 13 check digit Emulating Pure Blocks in Visual C#

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Emulating Pure Blocks
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A good approach in languages that don t have pure blocks is to view the begin and end keywords (or { and } tokens) as extensions of the control construct they re used with. Then it s sensible to try to emulate the Visual Basic formatting in your language. Listing 31-10is an abstract view of the visual structure you re trying to emulate:
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Listing 31-10. Abstract example of the pure-block layout style.
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A B C D
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In this style, the control structure opens the block in statement A and finishes the block in statement D. This implies that the begin should be at the end of statement A and the end should be statement D. In the abstract, to emulate pure blocks, you d have to do something like Listing 31-11:
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Listing 31-11. Abstract example of emulating the pure-block style.
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A B C D
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Some examples of how the style looks in C++ are shown in Listing 31-12, Listing 31-13, and Listing 31-14:
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Listing 31-12. C++ example of emulating a pure if block.
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if ( pixelColor == Color_Red ) {
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31. Layout and Style
Page 14
statement1; statement2; ... }
Listing 31-13. C++ example of emulating a pure while block.
while ( pixelColor == Color_Red ) { statement1; statement2; ... }
Listing 31-14. C++ example of emulating a pure switch/case block.
switch ( pixelColor ) { case Color_Red: statement1; statement2; ... break; case Color_Green: statement1; statement2; ... break; default: statement1; statement2; ... break; }
This style of alignment works pretty well. It looks good, you can apply it consistently, and it s maintainable. It supports the Fundamental Theorem of Formatting in that it helps to show the logical structure of the code. It s a reasonable style choice. This style is standard in Java and common in C++.
Using begin-end pairs (braces) to Designate Block Boundaries
A substitute for a pure block structure is to view begin-end pairs as block boundaries. If you take that approach, you view the begin and the end as statements that follow the control construct rather than as fragments that are part of it. Graphically, this is the ideal, just as it was with the pure-block emulation shown again in Listing 31-15:
Listing 31-15. Abstract example of the pure-block layout style.
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31. Layout and Style
Page 15
A B C D
But in this style, to treat the begin and the end as parts of the block structure rather than the control statement, you have to put the begin at the beginning of the block (rather than at the end of the control statement) and the end at the end of the block (rather than terminating the control statement). In the abstract, you ll have to do something like Listing 31-16.
Listing 31-16. Abstract example of using begin and end as block boundaries.
Some examples of how using begin and end as block boundaries looks in C++ are shown in Listing 31-17, Listing 31-18, and Listing 31-19:
Listing 31-17. C++ example of using begin and end as block boundaries in an if block.
if ( pixelColor == Color_Red ) { statement1; statement2; ... }
Listing 31-18. C++ example of using begin and end as block boundaries in a while block.
while ( pixelColor == Color_Red ) { statement1; statement2; ... }
Listing 31-19. C++ example of using begin and end as block boundaries in a switch/case block.
switch ( pixelColor ) { case Color_Red: statement1; statement2; ... break;
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31. Layout and Style
Page 16
case Color_Green: statement1; statement2; ... break; default: statement1; statement2; ... break; }
This alignment style works well. It supports the Fundamental Theorem of Formatting by exposing the code s underlying logical structure. Its only limitation is that it can t be applied literally in switch/case statements in C++ and Java, as shown by Listing 31-19. (The break keyword is a substitute for the closing brace, but there is no equivalent to the opening brace.)
Endline Layout
Another layout strategy is endline layout, which refers to a large group of layout strategies in which the code is indented to the middle or end of the line. The endline indentation is used to align a block with the keyword that began it, to make a routine s subsequent parameters line up under its first parameter, to line up cases in a case statement, and for other similar purposes. Listing 31-20 is an abstract example:
Listing 31-20. Abstract example of the endline layout style.
A B C D
In this example, statement A begins the control construct and statement D ends it. Statements B, C, and D are aligned under the keyword that began the block in statement A. The uniform indentation of B, C, and D shows that they re grouped together. Listing 31-21 is a less abstract example of code formatted using this strategy:
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