Computer Science - Digital Computer Electronics - Discussion


The m-bit parallel adder consists of:

[A]. (m+1) full adders
[B]. m/2 full adders
[C]. m-1 full adders
[D]. m full adders
[E]. None of the above

Answer: Option D


No answer description available for this question.

Abbas said: (Jul 12, 2014)  
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.

Rahul said: (Jan 3, 2016)  
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.

Parul said: (Jul 13, 2018)  
The exact answer is m-1 full adders and 1 half adder (for carry) but as per the options, it should be m-1.

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