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Math Help - Decimal to Binary conversion

  1. #1
    Newbie
    Joined
    Apr 2009
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    11

    Decimal to Binary conversion

    Hello,
    I need help in figuring out what im doing wrong:

    -15.625 ---> 11110001.10100000 OR 11110001.101

    but those turned out to be wrong.
    any ideas?
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  2. #2
    Senior Member
    Joined
    Apr 2009
    From
    Atlanta, GA
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    408
    Um, -15.625=-(2^3+2^2+2^1+2^0+2^{-1}+2^{-3})=-(1111.101)_2

    Are you trying to "sign" it as a computer would, to store it in bytes? This is different than a strictly mathematical conversion.
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  3. #3
    Newbie
    Joined
    Apr 2009
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    Thats what i was looking for. -1111.101
    thnx
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