A 2's-complement adder-subtracter can add or subtract binary numbers. Sign-magnitude numbers represent ............ decimal numbers, and 2 's complements stand for ......... decimal numbers.
In a 2's-complement adder-subtracter, positive numbers have the same form in sign-magnitude and in 2's complement (sign bit 0 followed by the magnitude).
So positive decimal numbers are written in sign-magnitude form, and negative decimal numbers are written in 2's complement form.
Answer: (C) positive, negative
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