define and enum

The define keyword allows you to assign new names to words. You can use the define keyword on nearly any word.

Examples:

(define rsVIEW $80) ; replaces any occurance of rsVIEW with $80 at compile time
(define PIC_OPEN_FROM_RIGHT 2)

The enum keyword lets you define symbols for sequentially increasing values. For instance, in the following example, DOOR_OPEN will be equal to 0, DOOR_OPENING will be equal to 1, and so on:

; Some door states
(enum
        DOOR_OPEN
        DOOR_OPENING
        DOOR_CLOSED
        DOOR_CLOSING
)

You can also specify a starting number for the enum values:

(enum 8
        DOOR_OPEN               ; this will be 8
        DOOR_OPENING    ; this will be 9
        DOOR_CLOSED             ; this will be 10, and so on...
)