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In the next fragment, the use of boolean variables makes the purpose of the if test clearer:
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Java Example of Boolean Test in Which the Purpose Is Clear
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finished = ( ( elementIndex < 0 ) || ( MAX_ELEMENTS < elementIndex ) ); repeatedEntry = ( elementIndex == lastElementIndex ); if ( finished || repeatedEntry ) { ... }
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Use boolean variables to simplify complicated tests Often when you have to code a complicated test, it takes several tries to get it right. When you later try to modify the test, it can be hard to understand what the test was doing in the first place. Logical variables can simplify the test. In the example above, the program is really testing for two conditions: whether the routine is finished and whether it s working on a repeated entry. By creating the boolean variables finished and repeatedEntry, you make the if test simpler easier to read, less error prone, and easier to modify.
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Here s another example of a complicated test:
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Visual Basic Example of a Complicated Test
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If ( ( document.AtEndOfStream() ) And ( Not inputError ) ) And _
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12. Fundamental Data Types
Page 13
( ( MIN_LINES <= lineCount ) And ( lineCount <= MAX_LINES ) ) And _ ( Not ErrorProcessing() ) Then ' do something or other ... End If
The test in the example is fairly complicated but not uncommonly so. It places a heavy mental burden on the reader. My guess is that you won t even try to understand the if test but will look at it and say, I ll figure it out later if I really need to. Pay attention to that thought because that s exactly the same thing other people do when they read your code and it contains tests like this. Here s a rewrite of the code with boolean variables added to simplify the test:
Visual Basic Example of a Simplified Test
allDataRead = ( document.AtEndOfStream() ) And ( Not inputError ) legalLineCount = ( MIN_LINES <= lineCount ) And ( lineCount <= MAX_LINES ) If ( allDataRead ) And ( legalLineCount ) And ( Not ErrorProcessing() ) Then ' do something or other ... End If
2 Here s the simple test.
This second version is simpler. My guess is that you ll read the boolean expression in the if test without any difficulty.
Create your own boolean type, if necessary Some languages, such as C++, Java, and Visual Basic have a predefined boolean type. Others, such as C, do not. In languages such as C, you can define your own boolean type. In C, you d do it this way:
C Example of Defining the BOOLEAN Type
typedef int BOOLEAN; // define the boolean type
Declaring variables to be BOOLEAN rather than int makes their intended use more obvious and makes your program a little more self-documenting.
12.6 Enumerated Types
An enumerated type is a type of data that allows each member of a class of objects to be described in English. Enumerated types are available in C++, and Visual Basic and are generally used when you know all the possible values of a variable and want to express them in words. Here are several examples of enumerated types in Visual Basic:
Visual Basic Examples of Enumerated Types
Public Enum Color
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12. Fundamental Data Types
Page 14
Color_Red Color_Green Color_Blue End Enum Public Enum Country Country_China Country_England Country_France Country_Germany Country_India Country_Japan Country_Usa End Enum Public Enum Output Output_Screen Output_Printer Output_File End Enum
Enumerated types are a powerful alternative to shopworn schemes in which you explicitly say, 1 stands for red, 2 stands for green, 3 stands for blue,... This ability suggests several guidelines for using enumerated types.
Use enumerated types for readability Instead of writing statements like
if chosenColor = 1
you can write more readable expressions like
if chosenColor = Color_Red
Anytime you see a numeric literal, ask whether it makes sense to replace it with an enumerated type.
Use enumerated types for reliability With a few languages (Ada in particular), an enumerated type lets the compiler perform more thorough type checking than it can with integer values and constants. With named constants, the compiler has no way of knowing that the only legal values are Color_Red, Color_Green, and Color_Blue. The compiler won t object to statements like color = Country_England or country = Output_Printer. If you use an enumerated type, declaring a variable as Color, the compiler will allow the variable to be assigned only the values Color_Red, Color_Green, and Color_Blue.
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