• tryThis() has been changed so that its argument
is not an int but a reference (or pointer) to an int.
(I have also changed the name, just to help me
remember that it is a pointer.)
• Inside the body of tryThis(), any time I want the
actual value I prefix it with a *. (This is called
dereferencing it (that is, undoing the process of
making it a reference).
• Finally, when I call tryThis() in main(), I need to
convert iTest (which is an integer) into a
reference or pointer to an integer. I do that using
the operator &