$IFNDEF Statement

Controls conditional compilation of source code.

Syntax

$IFNDEF symbol
    statement
    .
    .
    .
{$ELSE
    statement
    .
    .
    .}
$ENDIF

Syntax Elements

symbol The name of a symbol.

statement Any valid DataBasic statement.

Conditions

When the module is compiled:

• If symbol has not been defined, the statement(s) following $IFNDEF symbol are excluded. If a $ELSE clause is present, the statement(s) following $ELSE are included.

• If symbol has been defined using the $DEFINE or EQUATE statement, the statement(s) following $IFNDEF symbol are excluded. If a $ELSE clause is present, those following $ELSE are excluded.

Comments

Any number of valid DataBasic statements can be included or excluded following a $IFNDEF or $ELSE.

The $IFNDEF statement (with or without $ELSE) must be terminated with $ENDIF.

See Also

$IFDEF statement, $DEFINE statement, EQUATE statement, $UNDEFINE statement.

Example

$IFNDEF RELEASE
    PRINT COUNT, MYVALUE
$ENDIF

If the symbol RELEASE has not been defined, includes code that prints the values of the COUNT and MYVALUE variables; otherwise omits this line.