Introduce User Defined Data Types to Model Entities in the problem Domain
Modern language allow users to define types like the enumerated type. Such use of defining data types makes it possible for humans and computer systems to distinguish entities from the problem domain. When such facilities are available they should be exploited where applicable.
Example 51. When working with dates a types can be defined for the day of the week. In Pascal this is done as follows:
Type days = (Mon, Tue, Wed, Thur, Fri, Sat, Sun )
Variables can then be declared of this type. Suing such types makes the program much clearer then defining codes for each day and then working with codes. User defined data types that segment the problem domain in logical manner can greatly improve the clarity and readability of a source program. Under strong type checking rules user defined data types also provide increased data security.
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