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Bit Operation not working - UNIX Programming

Hi, Somehow my bit operation always negates the number. I have: int size = 141; char * packet = (char *) malloc ((sizeof(char)); packet[0] = 141 & 0xff; Instead of packet being 8d, ie 141, it becomes ffffff8d. Please help. Thank you, Marcia...

  1. #1

    Default Bit Operation not working

    Hi,
    Somehow my bit operation always negates the number.

    I have:
    int size = 141;
    char * packet = (char *) malloc ((sizeof(char));

    packet[0] = 141 & 0xff;

    Instead of packet being 8d, ie 141, it becomes ffffff8d.
    Please help.

    Thank you,
    Marcia



    Marcia Guest

  2. #2

    Default Re: Bit Operation not working

    How are you determining your value?

    --
    Frank

    "Marcia Hon" <com> wrote in message
    news:itTXb.60518$bloor.is.net.cable.rogers.com... 


    Frank Guest

  3. #3

    Default Re: Bit Operation not working

    Marcia Hon wrote: 

    Your first problem is that your parentheses are mismatched around
    "sizeof". Your second problem is that you're not just printing an
    individual char, you're converting it to some larger type first,
    probably int. As part of the conversion, the value in your (signed)
    char is being sign-extended. Try using unsigned char's for raw data.

    -Jeff

    Jeff Guest

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