13.1 User-defined data types

“Describe the purpose of a user-defined data type”

• To create a new data type (from existing data types)

• To allow data types not available in a programming language to be constructed // To extend the flexibility of the programming language

State what is meant by an enumerated data type

• A user-defined non-composite data type

• …. With a list of all possible values

• …that is ordered

State what is meant by the term pointer data type

• A user-defined non-composite data type

• …thta stores memory locations only

• … and indicated the type of data stored in the memory location

Describe what is meant by a composite data type

• A user-defined data type that is a collection of data that can consist of multiple elements

• …of different or the same data types

• …grouped under a single identifier

Describe what is meant by a non-composite data type

• It can be defined without referencing another data type

• It can be primitive type available in a programming language or a user-defined type

Describe the user-defined data type set

• A set user-defined data type is a composite data type

• … which includes a list of unordered elements

• Set theory operations, such as intersection and union, can be applied to these elements

• A set data type includes the type of data /data type is used as part of its definition

• All the elements are of the same data type 

Describe the user-defined data type record

• A record user-defined data type is a composite data type

• That can consist of one or more data types

• grouped under one identifier

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