Computer Science - Digital Computer Electronics - Discussion


How many full and half-adders are required to add 16-bit numbers?

[A]. 8 half-adders, 8 full-adders
[B]. 1 half-adders, 15 full-adders
[C]. 16 half-adders, no full-adders
[D]. 4 half-adders, 12 full-adders
[E]. None of the above

Answer: Option B


No answer description available for this question.

Anjali said: (Sep 20, 2016)  
Please clarify me for this problem. As I have read a number of full adders required is = 2^n, where n = number of bit, then here 15 full adders. How? Please explain.

Sameer said: (Nov 6, 2016)  
The one half-adder can add the least significant bit of the two numbers. Full adders are required to add the remaining 15 bits as they all involve adding carries.

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