Nope, it doesn' t work 
The code is the simplest ever wrote, it' s divided just in few phases:
-Read data from register MSB X
-Store in xhigh
-Read data from register LSB X
-Store in xlow
-X= (Bitshift xhigh of 8 and merge with OR to xlow)
I really can' t understand why it gives values over the maximum int value D: