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

(continued on next page)

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

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Compaq AA-PWCBD-TE Example 4-2 Cont. Global and Local Constant Declarations, Dectpu Operators, Type Symbol Description
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