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13. Unusual Data Types
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Visual Basic Example of Declaring Structures
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Structure Employee name As String address As String phone As String ssn As String gender As String salary As long End Structure Dim newEmployee As Employee Dim oldEmployee As Employee Dim previousOldEmployee As Employee
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Now you can switch all the elements in the old and new employee structures with three statements:
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previousOldEmployee = oldEmployee oldEmployee = newEmployee newEmployee = previousOldEmployee
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If you want to add a field such as numWithholdings, you simply add it to the Structure declaration. Neither the three statements above nor any similar statements throughout the program need to be modified. C++ and other languages have similar capabilities.
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For details on how much data to 1 share between routines, see 2 Keep Coupling Loose in 3 Section 5.3.
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0 CROSS-REFERENCE
Use structures to simplify parameter lists You can simplify routine parameter lists by using structured variables. The technique is similar to the one just shown. Rather than passing each of the elements needed individually, you can group related elements into a structure and pass the whole enchilada as a group structure. Here s an example of the hard way to pass a group of related parameters.
Visual Basic Example of a Clumsy Routine Call without a Structure
HardWayRoutine( name, address, phone, ssn, gender, salary )
Here s an example of the easy way to call a routine by using a structured variable that contains the elements of the first parameter list:
Visual Basic Example of an Elegant Routine Call with a Structure
EasyWayRoutine( employee )
If you want to add numWithholdings to the first kind of call, you have to wade through your code and change every call to HardWayRoutine(). If you add a numWithholdings element to Employee, you don t have to change the parameters to EasyWayRoutine() at all.
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13. Unusual Data Types
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For details on the hazards of 7 passing too much data, see 8 Keep Coupling Loose in 9 Section 5.3.
6 CROSS-REFERENCE
You can carry this technique to extremes, putting all the variables in your program into one big, juicy variable and then passing it everywhere. Careful programmers avoid bundling data any more than is logically necessary. Furthermore, careful programmers avoid passing a structure as a parameter when only one or two fields from the structure are needed they pass the specific fields needed instead. This is an aspect of information hiding: Some information is hidden in routines; some is hidden from routines. Information is passed around on a need-to-know basis.
Use structures to reduce maintenance Because you group related data when you use structures, changing a structure requires fewer changes throughout a program. This is especially true in sections of code that aren t logically related to the change in the structure. Since changes tend to produce errors, fewer changes mean fewer errors. If your Employee structure has a title field and you decide to delete it, you don t need to change any of the parameter lists or assignment statements that use the whole structure. Of course, you have to change any code that deals specifically with employee titles, but that is conceptually related to deleting the title field and is hard to overlook.
The big advantage of having structured the data comes in sections of code that bear no logical relation to the title field. Sometimes programs have statements that refer conceptually to a collection of data rather than to individual components. In such cases, individual components such as the title field are referenced merely because they are part of the collection. Such sections of code don t have any logical reason to work with the title field specifically and those sections are easy to overlook when you change title. If you use a structure, it s all right to overlook such sections because the code refers to the collection of related data rather than to each component individually.
13.2 Pointers
Pointer usage is one of the most error-prone areas of modern programming. It s error-prone to such an extent that modern languages including Java and Visual Basic don t provide a pointer data type. Using pointers is inherently complicated, and using them correctly requires that you have an excellent understanding of your compiler s memory-management scheme. Many common security problem, especially buffer overruns, can be traced back to erroneous use of pointers (Howard and LeBlanc 2003). Even if your language doesn t require you to use pointers, however, a good understanding of pointers will help your understanding of how your
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