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Subtracting binary numbers

  1. Sep 22, 2013 #1
    I am asked to come up with two 4-bit binary numbers, that when subtracted, provide the wrong result for both the unsigned and signed cases, inspecting only the first 4 bits of the output.

    I have come up with numerous combination where the unsigned is correct, the signed is wrong, and vice versa. But I can't get both of them to be wrong!

    Thank you for the help!
  2. jcsd
  3. Sep 22, 2013 #2

    Simon Bridge

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    Can you express the conditions that the operation gets the wrong result, in general terms, for each case?
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