PickBASIC / FlashBASIC

$IFNDEF directive

The $IFNDEF directive tests for the absence of a definition for an identifier in the compiler symbol table.

Syntax

$IFNDEF identifier statements 
{$ELSE statements}
$ENDIF


identifier	Specifies the symbol to be tested. If the symbol is not defined in the symbol table (by $DEFINE), statements following the identifier are executed. If the symbol is defined in the symbol table (by $DEFINE), the statements in the $ELSE clause are executed if specified. The $ENDIF directive is required.
$ELSE	(Optional) If the symbol is defined, the statements in the $ELSE clause are executed if specified.
$ENDIF	(Required) The $ENDIF directive marks the end of the $IFNDEF directive.