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1 definition found
 for twos complement
From The Free On-line Dictionary of Computing (18 March 2015) :

  twos complement
  
      A system used in some computers to represent negative
     numbers in binary.  Each bit of the number is inverted
     (zeros are replaced with ones and vice versa), as for ones
     complement, but then one (000...0001) is added (ignoring
     overflow).  This avoids the two representations for zero found
     in ones complement by using all ones to represent -1.
  
     	...
     	000...00011 = +3
     	000...00010 = +2
     	000...00001 = +1
     	000...00000 =  0
     	111...11111 = -1
     	111...11110 = -2
     	111...11101 = -3
     	...
  
     This representation simplifies the logic required for addition
     and subtraction, at the expense of a little extra complexity
     for negation.
  
     (1994-10-31)
  

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