Two's complement: Difference between revisions - Wikipedia

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'''Two's complement''' is the most common [[signed number representations|method of representing signed]] (positive, negative, and zero) [[Integer (computer science)|integers]] on computers,<ref>E.g. "Signed integers are two's complement binary values that can be used to represent both positive and negative integer values.", Section 4.2.1 in Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 1: Basic Architecture, November 2006</ref> and more generally, [[Fixed-point arithmetic|fixed point binary]] values. Two's complement uses the [[Most Significant Bit|binary digit with the <i>greatest</i> place value]] as the ''sign'' to indicate whether the binary number is positive or negative. When the [[most significant bit]] is ''1'', the number is signed as negative; and when the most significant bit is ''0'' the number is signed as positive.

Unlike the [[oneones's complement]] scheme, the two's complement scheme has only one representation for zero. Furthermore, arithmetic implementations can be used on signed as well as unsigned integers<ref>

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|first1=Alexandre |last1=Bergel