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Visual Basic has not really established firm conventions. The next section recommends a convention for Visual Basic.
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Mixed-Language Programming Considerations
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When programming in a mixed-language environment, the naming conventions (as well as formatting conventions, documentation conventions, and other conventions) may be optimized for overall consistency and readability even if that means going against convention for one of the languages that s part of the mix. In this book, for example, variable names all begin with lower case, which is consistent with conventional Java programming practice and some but not all C++ conventions. This book formats all routine names with an initial capital letter, which follows the C++ convention; the Java convention would be to begin method names with lower case, but this book uses routine names that begin in uppercase across all languages for the sake of overall readability.
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Sample Naming Conventions
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The standard conventions above tend to ignore several important aspects of naming that were discussed over the past few pages including variable scoping (private, class, or global), differentiating between class, object, routine, and variable names, and other issues. The naming-convention guidelines can look complicated when they re strung across several pages. They don t need to be terribly complex, however, and you can adapt them to your needs. Variable names include three kinds of information:
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11. The Power of Variable Names
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The contents of the variable (what it represents) The kind of data (named constant, primitive variable, user-defined type, or class) The scope of the variable (private, class, package, or global)
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Here are examples of naming conventions for C, C++, Java, and Visual Basic that have been adapted from the guidelines presented earlier. These specific conventions aren t necessarily recommended, but they give you an idea of what an informal naming convention includes.
Table 11-3. Sample Naming Convention for C++, and Java Entity ClassName TypeName Description Class names are in mixed upper and lower case with an initial capital letter. Type definitions including enumerated types and typedefs use mixed upper and lower case with an initial capital letter In addition to the rule above, enumerated types are always stated in the plural form. Local variables are in mixed uppercase and lowercase with an initial lower case letter. The name should be independent of the underlying data type and should refer to whatever the variable represents. Routines are in mixed uppercase and lowercase. (Good routine names are discussed in Section 5.2.) Member variables that are available to multiple routines within a class, but only within a class, are prefixed with an m_. Global variables are prefixed with a g_. Named constants are in ALL_CAPS. Macros are in ALL_CAPS. Enumerated types are prefixed with a mnemonic for their base type stated in the singular for example, Color_Red, Color_Blue.
EnumeratedTypes localVariable
RoutineName() m_ClassVariable
g_GlobalVariable CONSTANT MACRO Base_EnumeratedType
Table 11-4. Sample Naming Convention for C Entity TypeName GlobalRoutineName() f_FileRoutineName() Description Type definitions use mixed upper and lower case with an initial capital letter Public routines are in mixed uppercase and lowercase. Routines that are private to a single module (file) are prefixed with an f-underscore.
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11. The Power of Variable Names
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LocalVariable
Local variables are in mixed uppercase and lowercase. The name should be independent of the underlying data type and should refer to whatever the variable represents. Module (file) variables are prefixed with an funderscore.
f_FileStaticVariable
G_GLOBAL_GlobalVariable Global variables are prefixed with a G_ and a mnemonic of the module (file) that defines the variable in all uppercase for example, SCREEN_Dimensions. LOCAL_CONSTANT Named constants that are private to a single routine or module (file) are in all uppercase for example, ROWS_MAX. Global named constants are in all uppercase and are prefixed with G_ and a mnemonic of the module (file) that defines the named constant in all uppercase for example, G_SCREEN_ROWS_MAX. Macro definitions that are private to a single routine or module (file) are in all uppercase. Global macro definitions are in all uppercase and are prefixed with G_ and a mnemonic of the module (file) that defines the macro in all uppercase for example, G_SCREEN_LOCATION().
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