Question

So I’m reading a 12 bit integer from a byte array. That number can be negative but I cant figure out how to convert that to a useable variable int16/int32 in c#. Have a feeling I’ll need to do something with bit shifting or other bitwise operations but I’ve been striking out so far. Can someone point me in the right direction.

var x = 0xFFF;

This needs to prints out as -1 but c# naturally casts to an int32 and prints out as 4095. If this needs cast to int16 or int32 how do I preserve the negative value.

Answer 1

32-bit:

x = (x >> 11) == 0 ? x : -1 ^ 0xFFF | x;