Electronics Engineering · Digital Electronics
A 4-bit binary subtractor is implemented using a 4-bit binary adder. The subtraction is carried out using the expression: A - B = A + B + 1. What is the purpose of adding 1 in this expression?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To correct overflow during subtraction
- 2To generate a carry-out from the adder
- 3To obtain the 1's complement of B
- 4To complete the 2's complement of B✓
Correct answer
To complete the 2's complement of B
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