Reading 65531, actual value -5

[Sonnich Jensen]

Hi all

I cannot remember the word for this technique.

Some thing sends me numbers:
5 - is 5
65531 - is -5 - "negated".

Is there an easy way to transform these?

[mick]

Post by Sonnich Jensen
Hi all
I cannot remember the word for this technique.
5 - is 5
65531 - is -5 - "negated".
Is there an easy way to transform these?

2's Complement.

http://www.exploringbinary.com/twos-complement-converter/

mick


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[Sonnich Jensen]

Post by Sonnich Jensen
Hi all
I cannot remember the word for this technique.
5 - is 5
65531 - is -5 - "negated".
Is there an easy way to transform these?

This is what I want looking for:

byte[] data = new byte[2];
data[0] = 0xFB;
data[1] = 0xFF;
short value = System.BitConverter.ToInt16(data, 0);

[Arne Vajhøj]

Post by Sonnich Jensen

Post by Sonnich Jensen
5 - is 5
65531 - is -5 - "negated".
Is there an easy way to transform these?

byte[] data = new byte[2];
data[0] = 0xFB;
data[1] = 0xFF;
short value = System.BitConverter.ToInt16(data, 0);

(short)((data[1] << 8) | data[0]);

should also do it, but BitConverter.ToInt16 is more
readable.

Arne