Bitwise operators. Differences from javascript and PHP.

Discussion in 'Python' started by skorobogatov, Nov 17, 2006.

  1. skorobogatov

    skorobogatov Guest

    I can't understand a little thing in bitwise operations.

    In PHP and Javascript
    4653896912>>13 = -212992

    In Python and Ruby
    4653896912>>13 = 568102

    In Python and Ruby - it's ok. I understand.
    But i need to get in Python same value as in PHP and Javascript.
    How can i do this?
    skorobogatov, Nov 17, 2006
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  2. True

    not sure what PHP is doing with that expression, really.

    Fredrik Lundh, Nov 17, 2006
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  3. skorobogatov

    John Machin Guest

    So that someone who knows next-to-nothing about those 2 languages can
    help you, what is x >> n defined to do in PHP and Javascript?

    If you can answer that question, what part of the Python implementation
    of the PHP/Javascript definition are you having trouble with?

    If you can't answer it ... is the problem caused by the fact that
    4653896912 is, at 9 hex digits, a bit large for a 32-bit integer, those
    2 languages don't have longer integers [my guess],
    *and*, to quote something I found about PHP while googling,

    "In effect the bitwise operations [words "can be" omitted, I presume]
    safely applied to integer variables - their effect on booleans,
    float/double or string variables can be predicted but are not really
    useful" ???

    John Machin, Nov 17, 2006
  4. "can only be", more likely.
    sounds like we're in


    Fredrik Lundh, Nov 17, 2006
  5. skorobogatov

    John Machin Guest

    Yes, probably.

    from struct, more likely?
    Sounds like you could be correct. However it's possible that you have
    aided and abetted the OP to perpetrate a nonsense :)

    John Machin, Nov 17, 2006
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