Question

The advantage of 2’s complement system is that _________

(a) Only one arithmetic operation is required

(b) Two arithmetic operations are required

(c) No arithmetic operations are required

(d) Different Arithmetic operations are required

This question was posed to me in an online quiz.

My question is taken from 1’s, 2’s, 9’s & 10’s Complements in section Number System and Codes of Digital Circuits

Answer 1

Right answer is (a) Only one arithmetic operation is required

To elaborate: The advantage of 2’s complement is that only one arithmetic operation is required for 2’s complement’s operation and that is only addition. Just by adding a 1 bit to 1’s complement, we get 2’s complement.