Gray code in .NET.

Question

Is there any embedded gray code anywhere in the .NET platform? Or a conversion utility between gray and binary? I could do it myself, but if the wheel was already invented ...

Answer 1

Use this trick .

/*
        The purpose of this function is to convert an unsigned
        binary number to reflected binary Gray code.
*/
unsigned short binaryToGray(unsigned short num)
{
        return (num>>1) ^ num;
}

Difficult Trick: for up to 2 ^ n bits you can convert Gray to binary (2 ^ n) - 1 binary-gray conversion. All you need is the functions above and the for loop.

/*
        The purpose of this function is to convert a reflected binary
        Gray code number to a binary number.
*/
unsigned short grayToBinary(unsigned short num)
{
        unsigned short temp = num ^ (num>>8);
        temp ^= (temp>>4);
        temp ^= (temp>>2);
        temp ^= (temp>>1);
       return temp;
}

Answer 2

Here is a C # implementation that suggests that you want to do this only for non-negative 32-bit integers:

static uint BinaryToGray(uint num)
{
    return (num>>1) ^ num;
}

, , int, . , BitArray .

Answer 3

Perhaps this set of methods is useful.

• based on BitArray
• in both directions
• int or only n bits

just enjoy it.

public static class GrayCode
{
    public static byte BinaryToByte(BitArray binary)
    {
        if (binary.Length > 8)
            throw new ArgumentException("bitarray too long for byte");

        var array = new byte[1];
        binary.CopyTo(array, 0);
        return array[0];
    }

    public static int BinaryToInt(BitArray binary)
    {
        if (binary.Length > 32)
            throw new ArgumentException("bitarray too long for int");

        var array = new int[1];
        binary.CopyTo(array, 0);
        return array[0];
    }

    public static BitArray BinaryToGray(BitArray binary)
    {
        var len = binary.Length;
        var gray = new BitArray(len);
        gray[len - 1] = binary[len - 1]; // copy high-order bit
        for (var i = len - 2; i >= 0; --i)
        {
            // remaining bits 
            gray[i] = binary[i] ^ binary[i + 1];
        }
        return gray;
    }

    public static BitArray GrayToBinary(BitArray gray)
    {
        var len = gray.Length;
        var binary = new BitArray(len);
        binary[len - 1] = gray[len - 1]; // copy high-order bit
        for (var i = len - 2; i >= 0; --i)
        {
            // remaining bits 
            binary[i] = !gray[i] ^ !binary[i + 1];
        }
        return binary;
    }

    public static BitArray ByteToGray(byte value)
    {
        var bits = new BitArray(new[] { value });
        return BinaryToGray(bits);
    }

    public static BitArray IntToGray(int value)
    {
        var bits = new BitArray(new[] { value });
        return BinaryToGray(bits);
    }

    public static byte GrayToByte(BitArray gray)
    {
        var binary = GrayToBinary(gray);
        return BinaryToByte(binary);
    }

    public static int GrayToInt(BitArray gray)
    {
        var binary = GrayToBinary(gray);
        return BinaryToInt(binary);
    }

    /// <summary>
    ///     Returns the bits as string of '0' and '1' (LSB is right)
    /// </summary>
    /// <param name="bits"></param>
    /// <returns></returns>
    public static string AsString(this BitArray bits)
    {
        var sb = new StringBuilder(bits.Length);
        for (var i = bits.Length - 1; i >= 0; i--)
        {
            sb.Append(bits[i] ? "1" : "0");
        }
        return sb.ToString();
    }

    public static IEnumerable<bool> Bits(this BitArray bits)
    {
        return bits.Cast<bool>();
    }

    public static bool[] AsBoolArr(this BitArray bits, int count)
    {
        return bits.Bits().Take(count).ToArray();
    }
}

Answer 4

In .NET, there is nothing built into Gray code.

Answer 5

Graphical explanation of code conversion Gray - this may help a little