A and B are two numbers and I need to fill this truth table connected with adding and substracting this numbers with using 1 when something is correct, 0 false and as many as possible don't care - X. How should I do it?
I'm also confuded how should I interpret a and b?
Do I need for example 4. row add like 11 + 00 = 11 - > no carry and write Q add, correct is 1 or what? Or I should add that like 1+1+0+0=0 and CARRY=1 and than Q add, corr is 0?
Can someone help me with understanding this example and what should be correct solution for this whole table?
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