Computer Science - Digital Computer Electronics - Discussion

Please explain whether it wl b m or m-1 adders. A book I read is saying m-1 address but no explanation is provided.

Answer should be---->> m-1.

We need an adder for every bit. So we should need m full adders. A full adder adds a carry bit to two inputs and produces an output and a carry.

But the most significant bits can use a half adder, which differs from the full adder as in that it has no carry input, so we need m-1 full adders in m bit parallel adder.

The exact answer is m-1 full adders and 1 half adder (for carry) but as per the options, it should be m-1.

Here, according to the mentioned answer, there may be a chance of use m number of full adders itself because for the first-bit operation they may use a carry bit (0--> Ground).