One way to make a four-bit adder to perform subtraction is by ___________(a) Inverting the output(b) Inverting the carry-in(c) Inverting the B inputs(d) Grounding the B inputsI got this question during an online interview.Question is taken from 4-Bit Parallel Adder/Subtractor in division Arithmetic Circuits of Digital Circuits

One way to make a four-bit adder to perform subtraction is by ________

1.	One way to make a four-bit adder to perform subtraction is by ___________(a) Inverting the output(b) Inverting the carry-in(c) Inverting the B inputs(d) Grounding the B inputsI got this question during an online interview.Question is taken from 4-Bit Parallel Adder/Subtractor in division Arithmetic Circuits of Digital Circuits
Answer» Right answer is (c) INVERTING the B inputs For explanation: A adder is a digital circuit which adds bits along with a carry BIT from a previous stage, thus producing 2 outputs SUM and CARRY. Since, a four bit adder has four A, four B and a carry at the input END. So, for subtraction to be performed, all the BS terminal should be inverted.

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