http://prntscr.com/9mhycl - Here is a screenshot of how it looks.

Now I want to build it in real life but I have a few questions about that and some about the process itself:

- First of all: if ur A = 1, B = 1, Ci = 0 --> S = 0 and Co = 1 but what does this mean if you want to use it as a calculator? What numbers are you adding to get S and Co, because I dont understand how I change these bits to a number to use it as a calculator. Here is the table - http://prntscr.com/9mhyx9

- My second question is: how do I power this? I need buttons for A, B, (Ci ?) and some lights for S and Co. 1 OR Gate, 2 XOR Gates and 3 AND Gates (I can make these with Transistors)

(XOR Gate- http://prntscr.com/9mi33u)

(OR Gate- http://prntscr.com/9mi3u2)

- I got the general idea of each part individually but I don't know how to connect them and how to power them.

EDIT: If I might be completely wrong and that this is a 2-bit Adder. How does a 1-bit Adder look?