GATE 2002: In 2’s complement addition, overflow (a) is…

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GATE 2002:
In 2’s complement addition, overflow
(a) is flagged whenever there is carry from sign bit addition
(b) cannot occur when a positive value is added to a negative value
(c) is flagged when the carries from sign bit and previous bit match
(d) None of the above

Ravi Garg edited question
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    Madhav Purohit (anonymous)

    Hima Mehta: I do not posses good knowledge so kindly cn u pls explain in detail of gv me refernce 2 clear my doubt…

    Madhav Purohit answered
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      Madhav Purohit (anonymous)

      c for +ve sign bit wud b 0 nd 4 -ve it wud b 1 so no chance of betting overflow…!!:-)

      Madhav Purohit answered
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        Hima Mehta (anonymous)

        its c

        Hima Mehta answered
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          Madhav Purohit (anonymous)

          Hima Mehta: How cn u say…

          Madhav Purohit answered
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            Hima Mehta (anonymous)

            its the overflow condition … xor of carry bit and sign bit is 1 ..

            Hima Mehta answered
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