It's negative logic. Using a truth table you can see this better:
!a !b !c
d 1 1 1 = 1
a 0 1 1 = 0
b 1 0 1 = 0
c 0 0 1 = 0
Address "d" is not "a" so the !a rule is true. It is also not "b" so the
!b rule is true. It is also not "c" so the !c rule is true giving you
all true which results in a true (1) output. Next line ithe address
"does" contain "a" therefore the !a rule is false (0) This is an AND
table and is required to get the results you are looking for. So you
need to set up the rule to look for !a AND !b AND !c. HOpe this clears
it up some
Eric S
Sharyn Schmidt wrote:
Try using AND instead of OR...
Thanks, Dave.
Using AND worked, although I guess I don't understand the
reasoning behind it.
Appreciate the help!!! :)
Sharyn
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