The output is:
'cout' : undeclared identifier

because you forgot to include <iostream.h>


Seriously, though, it should be:
13, 12, 12, 10

Starting at the right, the variable value is printed, then incremented. So, "10" goes to cout (eventually). Then it is incremented to 11.

The increment that occurs to the left of this happens before the value is sent to cout, so it is incremented to 12, then printed.

Similarly with the last (err, first) two.