Sun, 4 Dec 2011, 22:41

A student writes:

> Dear Professor Patt,
> 
> Me and a friend of mine, ************,  were trying to prepare for the final
> exam and going over Question 13 in Problem Set 2. We understand the
> solution to this problem, however going over this with more of experience
> in the course, we were curious of the logic equation that can support the
> truth table. We know that there plenty of other topics we haven't reviewed
> yet, but we are just curious.
> 
> Thank you for your time and effort.
> 
> We are sorry for any inconvenience that may have been caused.
> 
> Sincerely,
> <<names withheld to protect students correctly reviewing the entire course>>

I am not sure where your problem is with this, which is why it is better
to see a TA where you can have a dialogue, rather than the one way 
interaction of email, which could also produce inordinate delay since 
I am at a conference.  However, I will try.

Since there are two outputs (D1 and D0), you need two logic equations,
one for D1 and one for D0.  Each gives you a single 0 or 1.  Together,
they give you the 2-bit encoding of the floor.

Good luck on the final exam.

Yale Patt