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NIELIT Scientific Assistant June 2025 | Question: 74

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What is the advantage of using a full adder over a half adder in binary addition?

  1. A full adder does not require a carry-in input.
  2. A full adder can add two $4$-bit numbers.
  3. A full adder handles carry inputs as well as carry outputs.
  4. A full adder is used in sequential circuits only.

1 Answer

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  • Half Adder: It can only add two single bits (A and B). It produces a Sum and a Carry, but it has no way to "listen" to a carry coming from a previous column.

     

  • Full Adder: It can add three bits: the two main bits (A and B) plus a Carry-in rom a lower-order column.

  • So option C is correct 

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