Adder is a component of a computer processor that adds numbers together. The adder takes numerical information passed into it and is able to determine amounts.

There are two types of adders: half adder and full adder. The half adder adds two single binary digits. It has two outputs, sum (S) and carry (C). The carry signal represents an overflow into the next digit of a multi-digit addition. A full adder adds binary numbers and accounts for values carried in as well as out.

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