Lexical Elements of the DEC Text Processing Utility Language 4.9 Reserved Words

4.9.4.10 Assignment Statement

The assignment statement assigns a value to a variable. In so doing, it associates the variable with the appropriate data type.

Syntax

identifi er := expression;

The assignment operator is a combination of two characters: a colon and an equal sign (:=). Do not confuse this operator with the equal sign (=), which is a relational operator that checks for equality.

DECTPU does not do any type checking on the data type being stored. Any data type may be stored in any variable. For example:

X := "abc";

This assignment statement stores the string "abc" in variable X.

4.9.4.11 Repetitive Statement

The LOOP/ENDLOOP statements specify the repetitive execution of a statement or statements until the condition specified by EXITIF is met.

Syntax

LOOP statement_1; statement_2; . . . EXITIF expression; statement_n;

ENDLOOP;

The EXITIF statement is the mechanism for exiting from a loop. You can place the EXITIF statement anywhere inside a LOOP/ENDLOOP combination. You can also use the EXITIF statement as many times as you like. When the EXITIF statement is true, it causes a branch to the statement following the ENDLOOP statement.

Syntax

EXITIF expression;

The expression is optional; without it, EXITIF always exits from the loop.

Any DECTPU language statement except an ON_ERROR statement can appear inside a LOOP/ENDLOOP combination. For example:

LOOP

EXITIF CURRENT_OFFSET = 0;

temp_string := CURRENT_CHARACTER; EXITIF (temp_string <> " ") AND

(temp_string <> ASCII(9)); MOVE_HORIZONTAL (-1); temp_length := temp_length + 1;

ENDLOOP;

This procedure uses the EXITIF statement twice. Each expression following an EXITIF statement defines a condition that causes an exit from the loop. The statements in the loop are repeated until one of the EXITIF conditions is met.

4.9.4.12 Conditional Statement

The IF/THEN statement causes the execution of a statement or group of statements, depending on the value of a Boolean expression. If the expression is true, the statement is executed; otherwise, program control passes to the statement following the IF/THEN statement.

The optional ELSE clause provides an alternative group of statements for execution. The ELSE clause is executed if the test condition specified by IF/THEN is false.

4–20Lexical Elements of the DEC Text Processing Utility Language

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Compaq AA-PWCBD-TE manual Assignment Statement, Repetitive Statement, Endloop, Conditional Statement
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