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Because Visual Basic is not case sensitive, special rules apply for differentiating between type names and variable names.
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Table 11-5. Sample Naming Convention for Visual Basic Entity C_ClassName T_TypeName Description Class names are in mixed upper and lower case with an initial capital letter and a C_ prefix. Type definitions including enumerated types and typedefs used mixed upper and lower case with an initial capital letter and a T_ prefix. 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_.
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T_EnumeratedTypes localVariable
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11. The Power of Variable Names
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CONSTANT Base_EnumeratedType
Named constants 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.
11.5 Standardized Prefixes
Standardizing prefixes for common meanings provides a terse but consistent and readable approach to naming data. The best known scheme for standardizing prefixes is the Hungarian naming convention, which is a set of detailed guidelines for naming variables and routines (not Hungarians!) that was widely used at one time in Microsoft Windows programming. Although the Hungarian naming convention is no longer in widespread use, the basic idea of standardizing on terse, precise abbreviations continues to have value. Standardized Prefixes are composed of two parts: the user-defined data type (UDT) abbreviation and the semantic prefix.
0 FURTHER READING For
1 further details on the
Hungarian naming convention, see The 3 Hungarian Revolution 4 (Simonyi and Heller 1991).
User-Defined Type (UDT) Abbreviation
The UDT abbreviation identifies the data type of the object or variable being named. UDT abbreviations might refer to entities such as windows, screen regions, and fonts. A UDT abbreviation generally doesn t refer to any of the predefined data types offered by the programming language. UDTs are described with short codes that you create for a specific program and then standardize on for use in that program. The codes are mnemonics such as wn for windows and scr for screen regions. Here s a sample list of UDTs that you might use in a program for a word processor:
Table 11-6. Sample of UDTs for a Word Processor UDT Abbreviation ch Meaning Character (a character not in the C++ sense, but in the sense of the data type a word-processing program would use to represent a character in a document) Document Paragraph Screen region Selection Window
doc pa scr sel wn
de Complete
11. The Power of Variable Names
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When you use UDTs, you also define programming-language data types that use the same abbreviations as the UDTs. Thus, if you had the UDTs in the table above, you d see data declarations like these:
CH SCR DOC PA PA WN chCursorPosition; scrUserWorkspace; docActive firstPaActiveDocument; lastPaActiveDocument; wnMain;
These examples are from a word processor. For use on your own projects, you would create UDT abbreviations for the UDTs that are used most commonly within your environment.
Semantic Prefix
Semantic prefixes go a step beyond the UDT and describe how the variable or object is used. Unlike UDTs, which vary project to project, semantic prefixes are somewhat standard across projects. Table 11-7 shows a list of standard semantic prefixes.
Table 11-7. Semantic Prefixes Semantic Prefix c first g i last lim Meaning Count (as in the number of records, characters, and so on) The first element that needs to be dealt with in an array. first is similar to min but relative to the current operation rather than to the array itself. Global variable Index into an array The last element that needs to be dealt with in an array. last is the counterpart of first. The upper limit of elements that need to be dealt with in an array. lim is not a valid index. Like last, lim is used as a counterpart of first. Unlike last, lim represents a noninclusive upper bound on the array; last represents a final, legal element. Generally, lim equals last + 1. Class-level variable The absolute last element in an array or other kind of list. max refers to the array itself rather than to operations on the array. The absolute first element in an array or other kind of list. Pointer
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