COMPUTER SCIENCE AND ENGINEERING
DIGITAL LOGIC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If A and B are the inputs of a half adder, the carry is given by
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A XOR B
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A AND B
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A XNOR B
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A OR B
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Explanation:
Detailed explanation-1: -Explanation: If A and B are the inputs of a half adder, the carry is given by: A(AND)B, while the sum is given by A XOR B.
Detailed explanation-2: -Full Adder is the adder which adds three inputs and produces two outputs. The first two inputs are A and B and the third input is an input carry as C-IN. The output carry is designated as C-OUT and the normal output is designated as S which is SUM.
Detailed explanation-3: -SUM = (A XOR B) XOR Cin = (A ⊕ B) ⊕ Cin CARRY-OUT = A AND B OR Cin(A XOR B) = A.B + Cin(A ⊕ B)
Detailed explanation-4: -As shown in Figure 5.1, the half adder has two inputs, A and B, and two outputs, S and Cout. S is the sum of A and B.
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