But if I try the for example that demerphq quotes under Perl 5.5.3 (on FreeBSD), I get ...

for (;;) ne for (EXPR; EXPR; EXPR). The expressionless C-style for is special: it's an infinite loop. while (1) would be very inefficient, because it would have to check an expression on every iteration. Perl is smart, and knows what you're doing, and optimizes as follows: 

2;0 juerd@ouranos:/root$ perl -MO=Deparse -e'while (1) { print }'
for (;;) {
    print $_;
}
-e syntax OK

[download]
You see? it's converted to for (;;) because it's more effecient. We can't benchmark the difference because of this optimization... 

U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

In reply to Re: Re: Re: Re: Re: infinite loop on while (@array) by Juerd
in thread infinite loop on while (@array) by jrasillo

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.