Implied

[luke]

Basically it's a shortcut for:

IF NOT (condition1 AND NOT condition2) THEN...

Or even just IF NOT condition1 OR condition2 THEN :)

[bplus]

And NOT A could be in B or NOT(in NOT B) ???

Well NOT (NOT B) gets us back to B again ;-))

Just saying if A implies B in Venn diagram then A must be a subset of B.

[SMcNeill]

Or even just IF NOT condition1 OR condition2 THEN :)

Good catch.  Your syntax is probably one we'd actually see more often than mine would be.  :D

[Dimster]

Ya Luke that was one expression I was about to explore and it works. Here's Steve test with your syntax

Code: QB64: [Select]

1. INPUT "ARE YOU LIVING (-1 FOR YES, 0 FOR NO)"; living
2. INPUT "ARE YOU DEAD (-1 FOR YES, 0 FOR NO)"; dead
3. Result = NOT (living) OR dead
4. IF Result = 0 THEN
5.     PRINT "YOU ARE A SENTIENT CREATURE"
6. ELSE
7.     PRINT "YOU ARE SOMETHING NON-SENTIENT."
8. END IF