draw the logic diagram

[acer5542]

Question-
Q9. Draw the truth table for a logic function that will subtract three bits to produce a
difference and a borrow.
10. Draw the logic diagram for a circuit that implements the function in question 9.

answer for Q9.

Truth table for Qn 9
_____B D -----B- Borrow D- Difference
0 0 0 | 0 0
0 0 1 | 1 1
0 1 0 | 1 1
0 1 1 | 1 0
1 0 0 | 0 1
1 0 1 | 0 0
1 1 0 | 0 0
1 1 1 | 1 1

Does my truth table correct? and I want to know how to draw Logic diagram for the logi function in qn9.

Thanks in Advance

:)

[acer5542]

i solved this with the help from the last thread

http://www.daniweb.com/forums/thread308838.html

d=(a^b)^c