COMPUTER SCIENCE AND ENGINEERING
COMPUTER ORGANIZATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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One way to make a four-bit adder to perform subtraction is by ____
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Inverting the output
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Inverting the carry-in
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Inverting the B inputs
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Grounding the B inputs
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Explanation:
Detailed explanation-1: -ANS: C-inverting the B inputs.
Detailed explanation-2: -One way to make a four-bit adder perform subtraction is by: inverting the output. inverting the carry-in. inverting the B inputs.
Detailed explanation-3: -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.
Detailed explanation-4: -The operations of both addition and subtraction can be performed by a one common binary adder. Such binary circuit can be designed by adding an Ex-OR gate with each full adder as shown in below figure.
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