read bit from byte


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Thread: read bit from byte

  1. #1
    Join Date
    Jan 2003
    Posts
    4

    read bit from byte

    I have this function which gets a byte as an integer and i want it to return the bit from the requested place .
    I got this code from someone but i don't understand what "input & (1 << bit) " does.




    code :

    /**
    * Check if selected bit is set in <code>input</code>.
    * @param input Value to check
    * @param bit Bit number to check (0..7 with 7 MSB)
    * @return 1 if bit is set, 0 otherwise
    */

    private int getBit(int input, int bit)
    {
    if ((input & (1 << bit)) > 0)
    {
    return 1;
    }
    else
    {
    return 0;
    }
    }

    }


    thanx in advance
    Narf

  2. #2
    Join Date
    Jan 2003
    Posts
    4
    it's ok, i have found it

    it wasn't so difficult after all

    (input & (1 << bit)) > 0


    the bit shifts the "1" in the byte(1) to the wanted location(given by bit)
    and then just compares it with that same position in the byte(input)
    and if it's greater then zero we know that the byte(input) has a "1" at that location


    greets
    Narf

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