c# ean 13 check digit CHECKLIST: Layout in Visual C#

Creator EAN13 in Visual C# CHECKLIST: Layout

CHECKLIST: Layout
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General
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Is formatting done primarily to illuminate the logical structure of the code Can the formatting scheme be used consistently Does the formatting scheme result in code that s easy to maintain Does the formatting scheme improve code readability
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Control Structures
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Does the code avoid doubly indented begin-end or {} pairs Are sequential blocks separated from each other with blank lines Are complicated expressions formatted for readability Are single-statement blocks formatted consistently Are case statements formatted in a way that s consistent with the formatting of other control structures
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de Complete
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31. Layout and Style
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Page 48
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Have gotos been formatted in a way that makes their use obvious
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Individual Statements
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Is white space used to make logical expressions, array references, and routine arguments readable Do incomplete statements end the line in a way that s obviously incorrect Are continuation lines indented the standard indentation amount Does each line contain at most one statement Is each statement written without side effects Is there at most one data declaration per line
Comments
Are the comments indented the same number of spaces as the code they comment Is the commenting style easy to maintain
Routines
Are the arguments to each routine formatted so that each argument is easy to read, modify, and comment Are blank lines used to separate parts of a routine
Classes, Files and Programs
Is there a one-to-one relationship between classes and files for most classes and files If a file does contain multiple classes, are all the routines in each class grouped together and is the class clearly identified Are routines within a file clearly separated with blank lines In lieu of a stronger organizing principle, are all routines in alphabetical sequence
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Additional Resources
Most programming textbooks say a few words about layout and style, but thorough discussions of programming style are rare; discussions of layout are rarer still. The following books talk about layout and programming style. Kernighan, Brian W. and Rob Pike. The Practice of Programming, Reading, Mass.: Addison Wesley, 1999. 1 of this book discusses programming style focusing on C and C++.
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31. Layout and Style
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Vermeulen, Allan, et al. The Elements of Java Style, Cambridge University Press, 2000. Bumgardner, Greg, Andrew Gray, and Trevor Misfeldt, 2004. The Elements of C++ Style, Cambridge University Press, 2004. Kernighan, Brian W., and P. J. Plauger. The Elements of Programming Style, 2d ed. New York: McGraw-Hill, 1978. This is the classic book on programming style the first in the genre of programming-style books. For a substantially different approach to readability, see the discussion of Donald Knuth s literate programming listed below. Knuth, Donald E. Literate Programming. Cambridge University Press, 2001. This is a collection of papers describing the literate programming approach of combining a programming language and a documentation language. Knuth has been writing about the virtues of literate programming for about 20 years, and in spite of his strong claim to the title Best Programmer on the Planet, literate programming isn t catching on. Read some of his code to form your own conclusions about the reason.
Key Points
The first priority of visual layout is to illuminate the logical organization of the code. Criteria used to assess whether the priority is achieved include accuracy, consistency, readability, and maintainability. Looking good is secondary to the other criteria a distant second. If the other criteria are met and the underlying code is good, however, the layout will look fine. Visual Basic has pure blocks and the conventional practice in Java is to use pure block style, so you can use a pure-block layout if you program in those languages. In C++, either pure-block emulation or begin-end block boundaries work well. Structuring code is important for its own sake. The specific convention you follow may be less important than the fact that you follow some convention consistently. A layout convention that s followed inconsistently might actually hurt readability. Many aspects of layout are religious issues. Try to separate objective preferences from subjective ones. Use explicit criteria to help ground your discussions about style preferences.
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