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Java Example of Good Loop Names in a Nested Loop
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for ( teamIndex = 0; teamIndex < teamCount; teamIndex++ ) { for ( eventIndex = 0; eventIndex < eventCount[ teamIndex ]; eventIndex++ ) { score[ teamIndex ][ eventIndex ] = 0; } }
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Carefully chosen names for loop-index variables avoid the common problem of index cross talk: saying i when you mean j and j when you mean i. They also make array accesses clearer. score[ teamIndex ][ eventIndex ] is more informative than score[ i ][ j ]. If you have to use i, j, and k, don t use them for anything other than loop indexes for simple loops the convention is too well established, and breaking it to use them in other ways is confusing. The simplest way to avoid such problems is simply to think of more descriptive names than i, j, and k.
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Naming Status Variables
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Status variables describe the state of your program. The rest of this section gives some guidelines for naming them.
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Think of a better name than flag for status variables It s better to think of flags as status variables. A flag should never have flag in its name because that doesn t give you any clue about what the flag does. For clarity, flags should be assigned values and their values should be tested with enumerated types, named constants, or global variables that act as named constants. Here are some examples of flags with bad names:
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if ( flag ) ...
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11. The Power of Variable Names
Page 9
if ( statusFlag & 0x0F ) ... if ( printFlag == 16 ) ... if ( computeFlag == 0 ) ... flag = 0x1; statusFlag = 0x80; printFlag = 16; computeFlag = 0;
Statements like statusFlag = 0x80 give you no clue about what the code does unless you wrote the code or have documentation that tells you both what statusFlag is and what 0x80 represents. Here are equivalent code examples that are clearer:
C++ Examples of Better Use of Status Variables
if ( dataReady ) ... if ( characterType & PRINTABLE_CHAR ) ... if ( reportType == ReportType_Annual ) ... if ( recalcNeeded == True ) ... dataReady = True; characterType = CONTROL_CHARACTER; reportType = ReportType_Annual; recalcNeeded = False;
Clearly, characterType = CONTROL_CHARACTER, from the second code example, is more meaningful than statusFlag = 0x80, from the first. Likewise, the conditional if ( reportType == ReportType_Annual ) is clearer than if ( printFlag == 16 ). The second example shows that you can use this approach with enumerated types as well as predefined named constants. Here s how you could use named constants and enumerated types to set up the values used in the example:
Declaring Status Variables in C++
// values for CharacterType const int LETTER = 0x01; const int DIGIT = 0x02; const int PUNCTUATION = 0x04; const int LINE_DRAW = 0x08; const int PRINTABLE_CHAR = ( LETTER | DIGIT | PUNCTUATION | LINE_DRAW ); const int CONTROL_CHARACTER = 0x80; // values for ReportType enum ReportType { ReportType_Daily, ReportType_Monthly,
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11. The Power of Variable Names
Page 10
ReportType_Quarterly, ReportType_Annual, ReportType_All };
When you find yourself figuring out a section of code, consider renaming the variables. It s OK to figure out murder mysteries, but you shouldn t need to figure out code. You should be able to read it.
Naming Temporary Variables
Temporary variables are used to hold intermediate results of calculations, as temporary placeholders, and to hold housekeeping values. They re usually called temp, x, or some other vague and nondescriptive name. In general, temporary variables are a sign that the programmer does not yet fully understand the problem. Moreover, because the variables are officially given a temporary status, programmers tend to treat them more casually than other variables, increasing the chance of errors.
Be leery of temporary variables It s often necessary to preserve values temporarily. But in one way or another, most of the variables in your program are temporary. Calling a few of them temporary may indicate that you aren t sure of their real purposes. Consider the following example.
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