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Q. |
How many full adders are required to construct an m-bit parallel adder? |
A. | m/2 |
B. | m |
C. | m-1 |
D. | m+1 |
Answer» C. m-1 | |
Explanation: we need adder for every bit. so we should need m bit 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 and 1 half adder in m bit parallel adder. |
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