Unicon Language Reference Clinton L. Jeffery Shamim Mohamed ...

$define symbol text
symbolic substitution
All subsequent occurrences of symbol are replaced by the text within the current file. Note that
$define does not support arguments, unlike C.
$include filename
The named file is inserted into the compilation in place of the $include line.
insert source file
$ifdef symbol
conditional compilation
$ifndef symbol
conditional compilation
$else
conditional alternative
$endif
end of conditional code
The subsequent lines of code, up to an $else or $endif, are discarded unless symbol is defined
by some $define directive. $ifndef reverses this logic.
$error text
The compiler will emit an error with the supplied text as a message.
compile error
$line number [filename] source code line #line number [filename] source code line
The subsequent lines of code are treated by the compiler as commencing from line number in the
file filename or the current file if no filename is given.
$undef symbol
remove symbol definition
Subsequent occurrences of symbol are no longer replaced by any substitute text.
EBCDIC transliterations
alternative bracket characters
These character combinations were introduced for legacy keyboards that were missing certain
bracket characters.
$ for {
$) for }
$< for [
$> for ]
These character combinations are substitutes for curly and square brackets on keyboards that
do not have these characters.
8.2 Predefined symbols
Predefined symbols are provided for each platform and each feature that is optionally compiled
in on some platforms. These symbols include:
Preprocessor Symbol Feature
V9 Version 9
AMIGA Amiga
ACORN Acorn Archimedes
CMS CMS
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