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DEC Text Processing Utility Data Types

A data type is a group of elements that ‘‘belong together’’; the elements are all formed in the same way and are treated consistently. The data type of a variable determines the operations that can be performed on it. The DECTPU data types are represented by the following keywords:

•ARRAY

•BUFFER

•INTEGER

•KEYWORD

•LEARN

•MARKER

•PATTERN

•PROCESS

•PROGRAM

•RANGE

•STRING

•UNSPECIFIED

•WIDGET

•WINDOW

You use data types to interpret the contents of a variable. Unlike many programming languages, DECTPU permits any variable to have any type of data as a value. DECTPU has no declaration statement to restrict the type of data that you can assign to a variable. DECTPU variables take on a data type when they are placed on the left-hand side of an assignment statement. The right-hand side of the assignment statement determines the data type of the variable.

Although you can construct variables freely, DECTPU built-in procedures require that their parameters be of specific data types. Each built-in procedure can operate only on certain data types. Some built-in procedures return a value of a certain data type when they are executed. The following sections describe the DECTPU data types.

DEC Text Processing Utility Data Types 3–1

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Compaq AA-PWCBD-TE manual DEC Text Processing Utility Data Types
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AA-PWCBD-TE specifications

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