Perl somehow knows what the execution order should be!
Eh, no. That's perl that knows, for a particular version of perl. The fact that it isn't defined in the language may mean that a next version may do it differently.
they are implied by the rules of precedence and associativity in perlop.
Eh, no. The rules of precedence and associativity only deal with parsing the language. They do not imply order of evaluation. The rules of precedence say that value of the expression:
E1 + E2 * E3
is calculated by multiplying the result of E2 and E3, and adding that to E1. It doesn't say E2 needs to be evaluated before E1 or E3. And indeed, current perl doesn't. In fact, it will evaluate E1, E2 and E3 in the same order as:
E1 * E2 + E3
even if the precedence of + and * are different.
-
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.
|