There is actually a bug in our state machine, in that there is an action which will cause our program problems. This is to do with what happens if the user enters an unfeasibly long morse character. No morse sequence has more than four items in it, but at the moment we don't set an upper limit on this. See what happens to our program if you enter very long morse characters and decide for yourself if this is a problem. It if is, think of a way of attacking it and see if your approach agrees with mine.
Exercise 9.4

Have a go at one or more of the improvements listed previously. See if you can think of extra improvememts which I haven't mentioned.