help please.:)

Show us what you already came up with and we will help you answer open 
questions :)

PittyJ wrote:
> I have to go to work on monday.
> Anyone here, who wants to help me?

Yep, but we wont do your homework for you...

It's fairly easy: start with the work and if it doesn't go further on, 
then ask about a  particular problem. But no way with: who wants to do 
my school exercises?

Tipp: The addition z=mod(a+b,2) is in fact the same as z=a xor b. You 
know the initial state of each variable. Just move the values according 
to the arrows and do the operations if they lead to an operator.

XOR:

1

a b z

2

0 0 0

3

1 0 1

4

0 1 0

5

1 1 0