Why do we actually need 1s compliment?
Can we simply make a number negative or positive by by just flipping one bit! the MSB bit? Why do we need to flip all bits
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Depending on your needs,
1s complement,2s complementorsign-magnitude(flipping the MS bit) can all be useful. There is no definitive criterion by which any of the representations is universally superior.To answer your question,
1s complementcan be better thansign-magnitudewhen you are performing arithmetic operations. You would need different hardware for addition and subtraction when usingsign-magnitude; but you can use the same hardware for both operations when using1s complement(i.e., addition is addition, subtraction is addition with complement).