Quoth perlop (update on seeing reply: or maybe perlop2):
....
I/O Operators
.... If and only if the input symbol is
the only thing inside the conditional of a "while" statement (even if disguised as a "for(;;)" loop), the value is
automatically assigned to the global variable $_, destroying whatever was there previously....
...
In these loop constructs, the assigned value (whether
assignment is automatic or explicit) is then tested to see
whether it is defined....
....
As with filehandle reads, an automatic "defined" is gener
ated when the glob occurs in the test part of a "while",
because legal glob returns (e.g. a file called 0) would
otherwise terminate the loop....
....
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|