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An adder is a digital circuit that performs addition of numbers.
Half-Adder
Schematic diagram of a half adder
Full-Adder
Schematic diagram of a full adder
Two Bit Adder/Full Adder + Full Adder
Schematic diagram of a two bit adder or full adder + full adder
Two Bit Adder/Half Adder + Full Adder
Schematic diagram of a two bit adder or half adder + full adder