-=> F. Tourigny wrote to All <=-

 FT> I enter a string, hit return, the line is displayed and I exit with
 FT> ^C, which has nothing to do with EOF, presumably, but that's another
 FT> story.  In any case the program exits with code -1.

As you say, ^C is not EOF; you're causing the program to abort. Type the
EOF code -- ^D for Unix, or ^Z for DOS -- and it should exit correctly.

 FT> Obviously, EOF isn't recognized in any of these two exercises.

No EOF was there to be recognized. :-)

Next message:

 FT> Nonzero is True, right?

Yes.

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