>Hi all,
>
>In VFP, what is the 'preferred' (read as future compatibility) way to use the AND & OR operators & NULL assignment. To use them with dots or not.
>

>*-- to DOT
>IF X .AND. (Y .OR. Z)
>   A = .NULL.
>ENDIF
>*-- or not to DOT
>IF X AND (Y OR Z)
>   A = NULL
>ENDIF
>

The dots were mandatory in FoxPlus and other versions prior to FoxPro. They are still allowed for compatibility's sake, but not necessary at all. Dropping them would be a good idea for the reasons others have already stated.