in the seventies, the programming language theory people were really big on non-determinism. when it comes to things like short circuit evaluation and stuff like that, they liked to say: "based on compiler implementation, your answer is guaranteed to be non-deterministic..." which meant: "there ain't no way to know..." That lesson has stuck with me, and whenever I find myself in a situation that might lead itself to non-determinisim (in other words, any situation with a vauge answer) i make sure that I can validate the order of operations. In your case:
my $val1=&sub1;
my $val2=&sub2;
my $total=$val1+$val2;

[download]
i don't know if perl guarantees an order of operations, but do yourself a favor, and do a favor to whomever has to look at your code some day down the line, minimize non-determinism.

In reply to Re: order of evaluation of operands by eduardo
in thread order of evaluation of operands by jlistf

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.