08-31-2013, 07:53 PM
2 inputs and a output and a carry in and out.
1 input = output
2 inputs = carry out.
1 input + carry in = carry out.
2 inputs + carry in = 1 output+ carry out.
1 input = output
2 inputs = carry out.
1 input + carry in = carry out.
2 inputs + carry in = 1 output+ carry out.