bitwise operations

This is a discussion on bitwise operations within the C Programming forums, part of the General Programming Boards category; Gday, I was wondering whether someone can help. I need to perform shifts and bitwise operations on 64bits. I am ...

  1. #1
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    bitwise operations

    Gday, I was wondering whether someone can help.

    I need to perform shifts and bitwise operations on 64bits. I am trying to shift bits on a double type - 8 bytes. I think the problem lies in the fact that a machine word is 4 bytes. The following code seems to compile ok

    double mask = 1 << 31;

    but when i try something like this

    double a, temp;

    temp = mask & a;

    i get an error something like: illegal operation on binary &.

    Can anyone suggest a fix, perhaps some pointers on shifting bits between machine worsds.

    cheers, Andrew.

  2. #2
    ATH0 quzah's Avatar
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    You cannot use bitwise operands on floating point variables.

    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
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    Thanks, i hadn't considered that.

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