Thread: Splitting unsigned long (newbie)

  1. #1
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    Splitting unsigned long (newbie)

    Hi there,
    sorry for my question,i'm newbie.

    I have a value like this in an unsigned long variable :

    B43D88CD

    and want to convert it to :

    CD883DB4

    like a cross-exchange or mirror

    it's possible to do that or i need to convert into string and make a routine which replace every char ?

    Thanks.
    Dave

  2. #2
    and the hat of int overfl Salem's Avatar
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    If you have
    unsigned long x = 0xB43D88CD;

    Then
    y = ( x >> 24 ) & 0xFF;
    will get you the 0xB4

    Similar use of << and | will allow you to reassemble the bytes in whatever order you want.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
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    Quote Originally Posted by Salem
    If you have
    unsigned long x = 0xB43D88CD;

    Then
    y = ( x >> 24 ) & 0xFF;
    will get you the 0xB4

    Similar use of << and | will allow you to reassemble the bytes in whatever order you want.
    Thanks ! i've done that :

    y = INJ & 0xFF;
    z = y;
    y = (INJ >> 8) & 0xFF;
    z = (z << 8) | y;
    y = (INJ >> 16) & 0xFF;
    z = (z << 8) | y;
    y = (INJ >> 24) & 0xFF;
    z = (z << 8) | y;

    where INJ contain the original hex value, and it work !!!
    thanks again
    Dave

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