Full Adder Truth Table
======================

Inputs    Outputs
------    -------
A B Cin   Cout Sum
-------------------
0 0 0     0    0
0 0 1     0    1
0 1 0     0    1
0 1 1     1    0
1 0 0     0    1
1 0 1     1    0   
1 1 0     1    0
1 1 1     1    1


Derive Expression for Cout.
Derive Expression for Sum.

Cout = B.Cin + A.B + A.Cin
      _ _       _   _                  _ _
Sum = A.B.Cin + A.B.Cin +  A.B.Cin + A.B.Cin