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Pascal Preprocessor 247

The rest of this appendix contains detailed descriptions and examples of each

directive.

The%config Directive

The %config directive is a predefined conditional variable with a value of

either true or false.

Syntax

%config

Comments

%config is true when you compile your program with the -config option;

otherwise, %config is false.

Use %config in an %if, %ifdef, %elseif, or %elseifdef directive to catch

any undefined values specified with -config. Do not define %config in the

%var directive.

%exit Stops processing the current Pascal source ﬁle.

%if When the compiler encounters a %if expression %then directive, it

evaluates expression. If expression is true, pc executes the statements

after %then. If expression is false, pc skips over %then.

%ifdef Determines whether or not you previously deﬁned a conditional

variable in a %var directive.

%include Inserts the lines from the speciﬁed ﬁle into the input stream.

%list Enables a listing of the program.

%nolist Disables the program listing.

%slibrary Inserts the lines from the speciﬁed ﬁle into the input stream. Same as

%include.

%var Deﬁnes conditional variables.

%warning Prints a warning string on the standard output.

Table A-1 cppas Compiler Directives (Continued)

Compiler

Directive Description

1 2 ... 266 267 268 269 270 271 272 273 274 275 276 ... 332 333

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HP SunSoft Pascal 4.0 Manual do Utilizador Página 271