>>>>>>#DEFINE's are string translations that take place at compile-time not run-time. That is, when PRG's etc. are converted into FXP's or EXE's etc.
>>>>>
>>>>>Houston,
>>>>>
>>>>>This isn't correct if the #DEFINE contains a function such as your INLIST() example. These are evaluated at run-time.
>>>>
>>>>George,
>>>>I just entered the following code into VFP6 SP3 running on NT4 SP6.

#DEFINE Sunday 1
>>>>#DEFINE Saturday 7
>>>>#DEFINE AWeekend   INLIST( iDayOfWeek, Saturday, Sunday )
>>>>
>>>>CLEAR
>>>>dCurrent = DATE()
>>>>iDayOfWeek = DOW( dCurrent )
>>>>IF (AWeekend) THEN
>>>>   ? "Yes it's a weekend."
>>>>ELSE
>>>>   ? "Not a weekend"
>>>>ENDIF

In my Edit, Preferences, I have 'Compile when saved' checked. After compiling the prg and running it for today (Monday), I get "Not a weekend", and then I changed the date to Sunday using my system clock and immediately ran the prg again (without any modifications and/or recompiling) - as expected the message changed to "Yes it's a weekend."
>>>>
>>>>If the INLIST() is 'evaluated' at compile-time, why does the message change?
>>>
>>>Hi Houston,
>>>
>>>Look, that George wrote to you:
>>>>>This isn't correct if the #DEFINE contains a function such as your INLIST() example. These are evaluated at run-time.
>>>
>>>With whom do you argue? :)
>>
>>Hi Nadya,
>>
>>With George! Since it was he that stated my example was not correct. Some additional hints: my reply was to George and I started the message with 'George'.
>>
>>I really hope I have not woke up to a 'Ground Hog Day' experience :-)
>
>Ok, let's try one more time (BTW, lurkers like me benefit from this discussion):
>
>You:
>#DEFINE's are string translations that take place at compile-time not run-time. That is, when PRG's etc. are converted into FXP's or EXE's etc.
>
>George:
>This isn't correct if the #DEFINE contains a function such as your INLIST() example. These are evaluated at run-time.
>
>Now it's clear, what part of sentence George referred as incorrect statement. In your sample you just confirmed it again. :))
>
>Simple logic thing, nothing more. :)

PMFJI but........

I've just run Houston's code and it worked just fine for me. I think the confusion is that

#DEFINE AWeekend   INLIST( iDayOfWeek, Saturday, Sunday )

isn't doing any calculation at this point. At compilation time

IF (AWeekend) THEN

will be compiled to

IF INLIST( iDayOfWeek, Saturday, Sunday ) THEN

and all is fine