What additional input does a full-adder require for its operation?

A full-adder is a fundamental component in digital electronics used for binary addition. It is specifically designed to add three binary numbers together: two significant bits and a carry bit that may arise from a previous less significant bit addition.

The two significant bits are the primary inputs that need to be added, while the additional carry input allows the full-adder to account for any overflow that occurs during the addition of lower-order bits. This is essential for performing multi-bit binary addition since it ensures proper propagation of carry information throughout the entire addition process.

Thus, the full-adder requires three binary inputs in total—two bits to be combined and one carry input—making it capable of producing the sum and the carry output accordingly.