Truth table with don't care values

A truth table with 0s and 1s only, is called a binary truth table.
What is a truth table with 0s, 1s, and don't care values allowed?

Also, please suggest a good graphical representation for truth tables with don't care values.

Thanks!
dshrenikAsked:
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phoffric\Commented:
A don't care value is often represented by an x. Just use your standard binary truth table and replace the 0 or 1 with an x if the value for x in the row does not affect the outcome.

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dshrenikAuthor Commented:
I'm planning to use green tick marks and red Xs for 1s and 0s.
Can you suggest a different representation for don't care?
Thanks!
cyberkiwiCommented:
>Can you suggest a different representation for don't care?
How about a black dot? As good as any..
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phoffric\Commented:
Using the more common notations, in general, is better if sufficient for your needs. Then, it is easier for the intended audience to more quickly interpret your presentation.
TommySzalapskiCommented:
If you are using a green check mark and a red x, I would use a yellow - since the - is often used to mean n/a or neutral and yellow is well known as being between red and green (from traffic lights).
TommySzalapskiCommented:
Also the dash is commonly used to mean unknown.
This type of table is called a "ternary truth table".
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