Hi World,

Im stuck on my Computer Science Homework. Ive found out that I need to compare it to a full adder and that is that. Can someone help me go step by step through it at I have to hand it by Friday and I am quite confused. I have aspergers and so have a hard time during lectures understanding. I have done all the questions except this one.

Edited by zeshansajid: n/a

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Last Post by vadriaan

Hmm... Very difficult to read what in the picture because of the low resolution. Anyway, here is what I got from it...

``````+---+---+---+---+---+---+
| 1 | 1 | 1 | 0 | 0 | 1 |
+---+---+---+---+---+---+
| 1 | 1 | 1 | 1 | 1 | 1 |
+---+---+---+---+---+---+
In your own word, describe the function of the above circuit. How did you come up with this conclusion.``````

I'm not sure what the table alone means. Do you think it is similar to A, B, C, D and the result of X, Z?

I suggest you re-arrange the labeling of the input. If you compare this circuit with the circuit of a normal full adder then B and C are the standard inputs (A, B) and D is the carry. I am not sure what A does, except to act as a carry-enable.
So make A high and cycle the others such that D, C, B = (0, 0, 0) (0, 0, 1)etc
You output X, Z should then closer reflect the output of a full adder

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