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12. Signed Numbers Addition, Cont.

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    INPUTS OUTPUTS
    Asign Bsign CARRY IN CARRY OUT SUMsign OVERFLOW
    0 0 0 0 0 0
    0 0 1 0 1 1
    0 1 0 0 1 0
    0 1 1 1 0 0
    1 0 0 0 1 0
    1 0 1 1 0 0
    1 1 0 1 0 1
    1 1 1 1 1 0

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  • When two signed 2's complement numbers are added, overflow is detected if:

    1. both operands are positive and the sum is negative, or

    2. both operands are negative and the sum is positive.

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