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18. Table-Driven Methods
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... else if ( 65 < age ) { rate = 575.00; } } else if ( maritalStatus == MaritalStatus.Married ) ... }
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The abbreviated version of the logic structure should be enough to give you an idea of how complicated this kind of thing can get. It doesn t show married females, any males, or most of the ages between 18 and 65. You can imagine how complicated it would get when you programmed the whole rate table. You might say, Yeah, but why did you do a test for each age Why don t you just put the rates in arrays for each age That s a good question, and one obvious improvement would be to put the rates into separate arrays for each age. A better solution, however, is to put the rates into arrays for all the factors, not just age. Here s how you would declare the array in Visual Basic:
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Visual Basic Example of Declaring Data to Set Up an Insurance-Rates Table
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Public Enum SmokingStatus SmokingStatus_First = 0 SmokingStatus_Smoking = 0 SmokingStatus_NonSmoking = 1 SmokingStatus_Last = 1 End Enum Public Enum Gender Gender_First = 0 Gender_Male = 0 Gender_Female = 1 Gender_Last = 1 End Enum Public Enum MaritalStatus MaritalStatus_First = 0 MaritalStatus_Single = 0 MaritalStatus_Married = 1 MaritalStatus_Last = 1 End Enum Const MAX_AGE As Integer = 125
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18. Table-Driven Methods
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Dim rateTable ( SmokingStatus_Last, Gender_Last, MaritalStatus_Last, _ MAX_AGE ) As Double
6 CROSS-REFERENCE
One advantage of a table-driven approach is that you can put the table s data in a file and read it at run time. That allows you to change something like an insurancerates table without changing the program itself. For more on the idea, see Section 10.6, Binding Time.
Once you declare the array, you have to figure out some way of putting data into it. You can use assignment statements, read the data from a disk file, compute the data, or do whatever is appropriate. After you ve set up the data, you ve got it made when you need to calculate a rate. The complicated logic shown earlier is replaced with a simple statement like this one:
Visual Basic Example of an Elegant Way to Determine an Insurance Rate
rate = rateTable( smokingStatus, gender, maritalStatus, age )
This approach has the general advantages of replacing complicated logic with a table lookup. The table lookup is more readable and easier to change, takes up less space, and executes faster.
Flexible-Message-Format Example
You can use a table to describe logic that s too dynamic to represent in code. With the character-classification example, the days-in-the-month example, and the insurance-rates example, you at least knew that you could write a long string of if statements if you needed to. In some cases, however, the data is too complicated to describe with hard-coded if statements. If you think you ve got the idea of how direct-access tables work, you might want to skip the next example. It s a little more complicated than the earlier examples, though, and it further demonstrates the power of table-driven approaches. Suppose you re writing a routine to print messages that are stored in a file. The file usually has about 500 messages, and each file has about 20 kinds of messages. The messages originally come from a buoy and give water temperature, the buoy s location, and so on. Each of the messages has several fields, and each message starts with a header that has an ID to let you know which of the 20 or so kinds of messages you re dealing with. Figure 18-2 illustrates how the messages are stored.
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18. Table-Driven Methods
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ID for Buoy Temperature Message Message Contents8
ID for Buoy Drift Message Message Contents8
ID for Buoy Location Message Message Contents8
F18xx02
Figure 18-2 Messages are stored in no particular order, and each one is identified with a message ID.
The format of the messages is volatile, determined by your customer, and you don t have enough control over your customer to stabilize it. Figure 18-3 shows what a few of the messages look like in detail.
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