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 P, Q, R are the inputs of a Full Adder then the sum is given by
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P AND Q AND R
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P XOR Q OR R
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P XOR Q AND R
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P XOR Q XOR R
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Explanation:
Detailed explanation-1: -= AB + C-IN (A’ B + A B’) Therefore COUT = AB + C-IN (A EX – OR B) Full Adder logic circuit. 2 Half Adders and a OR gate is required to implement a Full Adder.
Detailed explanation-2: -Explanation: If A, B and C are the inputs of a full adder then the sum is given by A XOR B XOR C.
Detailed explanation-3: -Full adder based comparator is a 2-bit comparator consist of 2 full adders, 2 inverters at one of the input And 2 and gate at the output side. There are three outputs. One shows A=B and another shows A>B and A<B.
Detailed explanation-4: -The sum output of the full adder is obtained by XORing the bits A, B, and Cin. While the carry output bit (Cout) is obtained using AND and OR operations.
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