What do you think it is and why do you think that?
The answer is that it is compiler dependent. It could be 10, it could be 11...
for example the compiler may do something along the line of i = i++
i = (temp = i) and increment i : temp is now 10 and i is now 11
i = temp : now i = 10 again
or i = i++
i = i and increment i : i is now 10 and then i is 11