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Better Visual Basic Examples of Using True and False for Tests Instead of Numeric Values
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Dim printerError As Boolean Dim reportSelected As ReportType Dim summarySelected As Boolean ... If ( Not printerError ) Then InitializePrinter() If ( printerError ) Then NotifyUserOfError() If ( reportSelected = ReportType_First ) Then PrintReport() If ( summarySelected ) Then PrintSummary()
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19. General Control Issues
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If your language doesn t support boolean variables and you have to emulate them, you might not be able to use this technique because emulations of True and False can t always be tested with statements like while ( not done ).
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In C, use the 1==1 trick to define TRUE and FALSE In C, sometimes it s hard to remember whether TRUE equals 1 and FALSE equals 0 or vice versa. You could remember that testing for FALSE is the same as testing for a null terminator or another zero value. Otherwise, an easy way to avoid the problem is to define TRUE and FALSE as follows:
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C Example of Easy-to-Remember Boolean Definitions
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#define TRUE (1==1) #define FALSE (!TRUE)
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7 CROSS-REFERENCE
details, see Section 12.5, Boolean Variables.
Making Complicated Expressions Simple
You can take several steps to simplify complicated expressions.
Break complicated tests into partial tests with new boolean variables Rather than creating a monstrous test with half a dozen terms, assign intermediate values to terms that allow you to perform a simpler test. Move complicated expressions into boolean functions If a test is repeated often or distracts from the main flow of the program, move the code for the test into a function and test the value of the function. For example, here s a complicated test:
Visual Basic Example of a Complicated Test
If ( ( document.AtEndOfStream ) And ( Not inputError ) ) And _ ( ( MIN_LINES <= lineCount ) And ( lineCount <= MAX_LINES ) ) And _ ( Not ErrorProcessing( ' do something or other ... End If ) ) Then
This is an ugly test to have to read through if you re not interested in the test itself. By putting it into a boolean function, you can isolate the test and allow the reader to forget about it unless it s important. Here s how you could put the if test into a function:
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19. General Control Issues
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For details on the technique of using intermediate variables to clarify a boolean test, see Use boolean variables to document your program in Section 12.5.
CROSS-REFERENCE
Visual Basic Example of a Complicated Test Moved Into a Boolean Function, With New Intermediate Variables To Make the Test Clearer
Function DocumentIsValid( _ ByRef documentToCheck As Document, _ lineCount As Integer, _ inputError As Boolean _ ) As Boolean Dim allDataRead As Boolean Dim legalLineCount As Boolean allDataRead = ( documentToCheck.AtEndOfStream ) And ( Not inputError ) legalLineCount = ( MIN_LINES <= lineCount ) And ( lineCount <= MAX_LINES ) DocumentIsValid = allDataRead And legalLineCount And ( Not ErrorProcessing() ) End Function
9 Intermediate variables are introduced here to clarify the test on the final line, below.
This example assumes that ErrorProcessing() is a boolean function that indicates the current processing status. Now, when you read through the main flow of the code, you don t have to read the complicated test:
Visual Basic Example of the Main Flow of the Code Without the Complicated Test
If ( DocumentIsValid( document, lineCount, inputError ) ) Then ' do something or other ... End If
4 KEY POINT
If you use the test only once, you might not think it s worthwhile to put it into a routine. But putting the test into a well-named function improves readability and makes it easier for you to see what your code is doing, and that is a sufficient reason to do it. The new function name introduces an abstraction into the program which documents the purpose of the test in code. That s even better than documenting the test with comments because the code is more likely to be read than the comments and it s more likely to be kept up to date too.
For details on using tables as 2 substitutes for complicated 3 logic, see 18, Table4 Driven Methods.
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