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Re: Re: Re: question about $_ and eof

by strat (Canon)
on Mar 13, 2002 at 12:36 UTC ( #151356=note: print w/replies, xml ) Need Help??

in reply to Re: Re: question about $_ and eof
in thread question about $_ and eof

> A: <STDIN> is returning a newline character '\n', which
> is true. In practice, regardless of O/S, you never get
> the empty string or a bare 0, hence the only false value
> you encounter is undef.

I think, the construct while (<STDIN>) { is just another way to write:  while (defined ($_ = <STDIN>)){, not only for while ($_ = <STDIN>) {.

The difference is not big; only if there is a 0 (=zero) on the last line of a file without \n, it can become essential. But with pure STDIN this case might never happen, only with files or the like...

Best regards,
perl -le "s==*F=e=>y~\*martinF~stronat~=>s~[^\w]~~g=>chop,print"

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