Error Numbers
If you ran the ensure.rb program earlier and you were watching closely, you may have noticed something unusual when you tried to log onto a nonexistent drive (for example, on my system that might be the X:\ drive). Often, when an exception occurs, the exception class is an instance of a specific named type such as ZeroDivisionError or NoMethodError. In this case, however, the class of the exception is shown to be Errno::ENOENT.
It turns out that there is quite a variety of Errno errors in Ruby. Try disk_err.rb. This defines a method, chDisk, which attempts to log onto a disk identified by the character, aChar. So if you pass “A” as an argument to chDisk, it will try to log onto the A:\ drive. I’ve called the chDisk method three times, ...
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