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Making the Program Robust

We now have a running program that meets ther spec.

But is it "robust"?

How do we find out?

Try to "break" it.

Testing a program like this for robustness involves several steps:

* What can go wrong?
* What happens if it does?
Sometimes nothing needs to be done.
* If that is a problem, how can we detect it?
* What can we do about it?
* Tell the user.
* Die gracefully
* Recover reasonably.


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