Re: Exception problem

[Larry Coon <larry@fs2.assist.uci.edu>]

Arthur Evans Jr wrote:

> . . . Add a call to Skip_Line.

That did the trick, thanks.

By the way, that brings up another question....that of when it's
appropriate to use exceptions.  In C++, for example, you wouldn't want
to throw an exception because your number should be positive and you got
a negative.  In C++, you're using an int to represent this number, and
for an int to be -3 is not an exceptional condition.  However, in Ada
subtypes and derived types allow you to declare integers for which -3
truly is an exceptional condition, making it very appropriate to raise
(see, I even got the terminology right!) an exception.

Writing that code almost made me feel guilty for using exceptions the
wrong way, and I wanted to make sure I'm thinking about them in the
right way in Ada.

Larry Coon
University of California
larry@fs2.assist.uci.edu