2's compliment conversion
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Thread: 2's compliment conversion

  1. #1
    Join Date
    Jul 2010
    Posts
    10

    2's compliment conversion

    Hi
    I have 3 bytes of data that I am told represent a 24 bit integer. I am also told that the the data is in 2's compliment.
    How do i covert the bytes to an integer value

    Thanks for your time

  2. #2
    Join Date
    May 2001
    Location
    Germany
    Posts
    1,111

    Re: 2's compliment conversion


  3. #3
    Join Date
    Oct 2006
    Location
    Sweden
    Posts
    3,634

    Re: 2's compliment conversion

    Code:
    unsigned char data[3];
    int result = ((data[0] << 24) + (data[1] << 16) + (data[2] << 8)) >> 8;
    Assuming the data is big-endian and that int is 32 bits on your platform. The last shift is to sign extend the result.
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  4. #4
    Join Date
    Jul 2010
    Posts
    10

    Re: 2's compliment conversion

    Thanks!!!

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