Just a quick one - getting unexpected result for bitwise AND

This is a discussion on Just a quick one - getting unexpected result for bitwise AND within the C++ Programming forums, part of the General Programming Boards category; My code: Code: Primitive<uint64_t> full = 0xBBBBBBBBCCCCCCCC; Primitive<uint64_t> first = 0x0000000000000000; first = (full & 0xFFFFFFFE00000000); std::cout << "FIRST: " ...

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    Just a quick one - getting unexpected result for bitwise AND

    My code:

    Code:
    Primitive<uint64_t> full = 0xBBBBBBBBCCCCCCCC;
    Primitive<uint64_t> first = 0x0000000000000000;
    first = (full & 0xFFFFFFFE00000000);
    std::cout << "FIRST: " << first << std::endl;
    Result I am getting:

    FIRST: 13527612313275727872

    Which is 0x12C5F92C33333333 .

    I was expecting 0xBBBBBBBA00000000 .


    UPDATE.

    Looks like the problem is with initialising 'full'.

    For this code:
    Code:
    Primitive<uint64_t> full = 0xBBBBBBBBCCCCCCCCULL;
    unsigned long long f = 0xBBBBBBBBCCCCCCCCULL;
    std::cout << "f: " << f << std::endl;
    std::cout << "full: " << full << std::endl;
    I also get the same result:

    f: 13527612321006669004
    full: 13527612321006669004

    UPDATE 2.

    Was a problem with std::cout - was printing numbers as negative for some reason.
    Problem solved now.
    Last edited by mondaytofriday; 06-25-2013 at 02:10 AM. Reason: update

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