I've seen two ways to represent a negative number in binary system. One approach is having the left-most digit as a signed bit, 0 indicating positive and 1 indicating negative. Another approach is taking 2'complement of a positive number to get its opposite number.
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What do you mean by "correct"? Most systems use 2s-complement these days but I wouldn't call it "correct". – tkausl Jun 30 '16 at 02:20
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1Voting to close as primarily opinion-based (which in fact this is). Either system works well, neither is 'better' than the other. – Akshat Mahajan Jun 30 '16 at 02:22
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http://stackoverflow.com/questions/2931630/how-are-negative-numbers-represented-in-32-bit-signed-integer – crashmstr Jun 30 '16 at 02:22
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Yes `2'complement` – Enzokie Jun 30 '16 at 02:28
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Usually you want to use the second approach. It allows you to keep your addition methods unchanged.
Google will answere this question for you ;-)
Patrick M
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