4

Lexical Elements of the DEC Text Processing Utility Language

4.1 Overview

A DECTPU program is composed of lexical elements. A lexical element may be an individual character, such as an arithmetic operator, or it may be a group of characters, such as an identifier. The basic unit of a lexical element is a character from either the DEC Multinational Character Set or the ISO_LATIN1 Character Set.

This chapter describes the following DECTPU lexical elements:

•Character set

•Identifiers

•Variables

•Constants

•Operators

•Expressions

•Reserved words

•Lexical keywords

4.2Case Sensitivity of Characters

The DECTPU compiler does not distinguish between uppercase and lowercase characters except when they appear as part of a quoted string. For example, the word EDITOR has the same meaning when written in any of the following ways:

EDITOR EDitOR editor

The following, however, are quoted strings, and therefore represent different values:

"XYZ" "xyz"

Lexical Elements of the DEC Text Processing Utility Language 4–1

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Compaq AA-PWCBD-TE manual Overview, Case Sensitivity of Characters
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AA-PWCBD-TE specifications

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