Convert ushort to string

I have a ushort that consists of two bytes.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Y = bits 10-0, twos complement mantissa integer.

N = bits 15-11, twos complement integer.

X = Y * 2^N

I need to ouput X as a string.

This is what I have tried:

    private string ConvertLinearToString(ushort data)
    {
        int N;
        int Y;
        int X;

        N = Convert.ToInt16(GetBitRange((byte)data, 0, 5));
        Y = Convert.ToInt16(GetBitRange((byte)data, 6, 11));
        X = Convert.ToInt16(Y * Math.Pow(2, (double)N));

        return Convert.ToString(result);            
    }

    private byte GetBitRange(byte b, int offset, int count)
    {
        return Convert.ToByte((b >> offset) & ((1 <<开发者_Python百科; count) - 1));
    }

I'm stuck trying to convert the GetBitRange() formula to use ushort and also how to handle the twos complement.

You can get the two's complement behavior by using a left shift to throw away bits you don't want followed by a right shift to sign extend. If you implement GetBitRange using 32-bit integers like this:

private static int GetBitRange(int data, int offset, int count)
{
    return data << offset >> (32 - count);
}

Then just let the ushorts get converted to ints in ConvertLinearToString:

private static string ConvertLinearToString(ushort data)
{
    var n = GetBitRange(data, 16, 5);
    var y = GetBitRange(data, 21, 11);
    var value = y * Math.Pow(2, n);
    return value.ToString();
}

Just covert your unsigned short to an integer and use the method to do the conversion.

ushort u = 10;
string s = Convert.ToString((int)u);

This solution is reasonably safe from overflow. There maybe some future version of C# where this operation would no longer be safe.