Compaq AA-PWCBD-TE Manuel d'utilisateur télécharger pdf (Page 73)

Lexical Elements of the DEC Text Processing Utility Language

4.6 Constants

Example 4–2 (Cont.) Global and Local Constant Declarations

PROCEDURE user_hello_world

CONSTANT

world := "world";

MESSAGE (user_hello + " " + world); ! Display "Hello world"

! in message area

ENDPROCEDURE;

4.7 Operators

DECTPU uses symbols and characters as language operators. There are ﬁve

types of operators:

• Arithmetic

• String

• Relational

• Pattern

• Logical

Table 4–5 lists the symbols and language elements that DECTPU uses as

operators.

Table 4–5 DECTPU Operators

Type Symbol Description

Arithmetic + Addition, unary plus

– Subtraction, unary minus

* Multiplication

/ Division

String + String concatenation

- String reduction

* String replication

Relational <> Not equal to

= Equal to

< Less than

<= Less than or equal to

> Greater than

>= Greater than or equal to

Pattern | Pattern alternation

@ Partial pattern assignment

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Lexical Elements of the DEC Text Processing Utility Language 4–7

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Compaq AA-PWCBD-TE Manuel d'utilisateur Page 73