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12. Fundamental Data Types
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To make modifications easier. It s little work to create a new type, and it gives you a lot of flexibility. To avoid excessive information distribution. Hard typing spreads data-typing details around your program instead of centralizing them in one place. This is an example of the information-hiding principle of centralization discussed in Section 6.2. To increase reliability. In Ada you can define types such as type Age_t is range 0..99. The compiler then generates run-time checks to verify that any variable of type Age_t is always within the range 0..99. To make up for language weaknesses. If your language doesn t have the predefined type you want, you can create it yourself. For example, C doesn t have a boolean or logical type. This deficiency is easy to compensate for by creating the type yourself:
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typedef int Boolean_t;
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Why Are the Examples of Creating Your Own Types in Pascal and Ada
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Pascal and Ada have gone the way of the stegosaurus and, in general, the languages that have replaced them are more usable. In the area of simple type definitions, however, I think C++, Java, and Visual Basic represent a case of three steps forward and one step back. An Ada declaration like
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currentTemperature: INTEGER range 0..212;
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contains important semantic information that a statement like
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int temperature;
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does not. Going a step further, a type declaration like
type Temperature is range 0..212; ... currentTemperature: Temperature;
allows the compiler to ensure that currentTemperature is assigned only to other variables with the Temperature type, and very little extra coding is required to provide that extra safety margin. Of course a programmer could create a Temperature class to enforce the same semantics that were enforced automatically by the Ada language, but the step from creating a simple data type in one line of code to creating a class is a big step. In many situations, a programmer would create the simple type but would not step up to the additional effort of creating a class.
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12. Fundamental Data Types
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Guidelines for Creating Your Own Types
5 CROSS-REFERENCE
6 each case, consider whether
creating a class might work better than a simple data type. 7 For details, see 6, 8 Working Classes.
Here are a few guidelines to keep in mind as you create your own user-defined types:
Create types with functionally oriented names Avoid type names that refer to the kind of computer data underlying the type. Use type names that refer to the parts of the real-world problem that the new type represents. In the examples above, the definitions created well-named types for coordinates and names real-world entities. Similarly, you could create types for currency, payment codes, ages, and so on aspects of real-world problems.
Be wary of creating type names that refer to predefined types. Type names like BigInteger or LongString refer to computer data rather than the real-world problem. The big advantage of creating your own type is that it provides a layer of insulation between your program and the implementation language. Type names that refer to the underlying programming-language types poke holes in the insulation. They don t give you much advantage over using a predefined type. Problem-oriented names, on the other hand, buy you easy modifiability and data declarations that are self-documenting.
Avoid predefined types If there is any possibility that a type might change, avoid using predefined types anywhere but in typedef or type definitions. It s easy to create new types that are functionally oriented, and it s hard to change data in a program that uses hardwired types. Moreover, use of functionally oriented type declarations partially documents the variables declared with them. A declaration like Coordinate x tells you a lot more about x than a declaration like float x. Use your own types as much as you can. Don t redefine a predefined type Changing the definition of a standard type can create confusion. For example, if your language has a predefined type Integer, don t create your own type called Integer. Readers of your code might forget that you ve redefined the type and assume that the Integer they see is the Integer they re used to seeing. Define substitute types for portability In contrast to the advice that you not change the definition of a standard type, you might want to define substitutes for the standard types so that on different hardware platforms you can make the variables represent exactly the same entities. For example, you can define a type INT and use it instead of int, or a type LONG instead of long. Originally, the only difference between the two types would be their capitalization. But when you moved the program to a new
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