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Homework Help: How to find decimal of a number in One's Complement form?

  1. Aug 30, 2015 #1
    1. The problem statement, all variables and given/known data
    Assume the number
    https://www.physicsforums.com/tel:1111111 [Broken]
    Is in one's complement form, what is its decimal values?

    2. Relevant equations

    2^7 + 2^6 + 2^5 + 2^4 + 2^3 + 2^2 + 2^1 + 2^0

    1 in first sign bit indicates negative
    0 in first sign bit indicates positive

    3. The attempt at a solution

    The first thing I did to solve this problem is that we know that 1111111 is already in 1's complement form and so I inverse the bits and got 0000000. Noticing that there is a 1 in the first sign bit of the binary 1111111 that is in 1s complement form, I included a 'negative' to the decimal 0. From the inverse number 0000000... Is simply added to equal 0...and got -0.

    is this the correct method in approaching this? any guidance would be appreciated! Thank you
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Aug 30, 2015 #2


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    Homework Helper

    In one's complement, all 1's is negative zero. Some processors will automatically convert all 1's to all 0's in their results.
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