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What word does CO CI of half adder and full adder stand for?
C in the adder is the abbreviation of carry in the adder result. Because the actual adder can't have only one bit, adding 0, 1, 2 ... after c indicates which carry it is. (Ci, I indicates where C is, such as 2 0 (1= 0), 21(I =1), 2 2 (I = 2). )