>>How do you simplify the following VFP expression?
>>
>>
>>(A and not B) or (B and not A)
>>
>>
>>(I wasn't sure whether I should place this in "Chatter | Puzzles", or in "VFP | Chatter...". Anyway, I know the answer to this one, but wanted to present it to the community, as a puzzle.)
>>
>Hilmar,
(A # B)
Yes, that is the answer. I usually code this as follows:
#define XOR #
...
if A XOR B
...
The equivalency can be established through truth tables, which I will include here for others who read this thread:
A B !A !B (1) (2) (3) A#B
T T F F F F F F
T F F T T F T T
F T T F F T T T
F F T T F F F F
(1): A AND NOT B
(2): B AND NOT A
(3): (1) OR (2)
As you can see, the last two columns are equivalent.
Hilmar.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
