HP SunSoft Pascal 4.0 - Manual (Page 270)

246 Pascal 4.0 User’s Guide
A
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
%els e.
%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.