Adders & subtractors

Discussion in 'Homework Help' started by Ro3a, Jan 9, 2009.

  1. Ro3a

    Thread Starter New Member

    Nov 6, 2008
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    0
    Hi everybody ..
    Could u help me in designin` a two 2-bit adder & a full subtractor ?
    best regards,,
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Work up a truth table and use that as a guide. Subtraction may be done by adding the compliments of the numbers.
     
  4. Ro3a

    Thread Starter New Member

    Nov 6, 2008
    5
    0
    ok , how will the truth tabe look like ?
    PLZ Check if im going write or not

    p q x y z
    0 0 0 0 0 0 0
    0 0 0 1 0 0 1
    0 0 1 0 0 1 1
    0 0 1 1 1 0 0
    0 1 0 0 0 1 0
    0 1 0 1 0 1 1
    0 1 1 0 1 0 1
    0 1 1 1 1 1 0
    and so on :confused:
     
  5. Ro3a

    Thread Starter New Member

    Nov 6, 2008
    5
    0
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