User Defined Data Types

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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