HP SunSoft Pascal 4.0 Manuale Utente Scaricare il pdf (Pagina 270)

246 Pascal 4.0 User’s Guide

A defined conditional variable is enabled (true) when it appears in either the

%enable directive or in the –config option; otherwise, it is disabled (false),

as in:

The following section describes %var and %enable. Programs that contain

conditional variables must be compiled with the –xl option.

Compiler Directives

A directive indicates some action for the compiler to take. You can use a

directive anywhere in your program.

Each directive consists of a percent sign (%) followed by the directive name.

Programs that contain compiler directives must be compiled with the –xl

option.

Table A-1 summarizes the compiler directives.

%var one two

%enable two

Table A-1 cppas Compiler Directives

Compiler

Directive Description

%config Sets a special predeﬁned conditional variable with a value of either

true or false.

%debug Instructs pc to compile this line of code when you use the -cond

compiler directive.

%else If expression in %if expression %then is false, the compiler skips over

the %then part and executes the %else part instead.

%elseif If expression in %if expression %then is false, the compiler skips over

the %then part and executes the %elseif part instead. Similar to

%else.

%elseifdef If expression in %ifdef expression %then is false, the compiler skips over

the %then part and executes the %elseifdef part instead.

%enable Sets a conditional variable to true.

%endif Indicates the end of an %if or %ifdef directive.

%error Prints a string on the standard output and treats it as an error.

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HP SunSoft Pascal 4.0 Manuale Utente Pagina 270