Precedence is not the issue in comparing 
$x >= $x_min and $x <= $x_max and $y >= $y_min and $y <= $y_max

[download]
with 
($x >= $x_min and $x <= $x_max) and ($y >= $y_min and $y <= $y_max)

[download]
Neither will work if and has higher precedence than &lt;= and &gt;=!

The issue with the extra brackets here is to add a structure to the code that simplifies understanding. Instead of having to understand 4 independent logical tests, I have to understand 2 logical tests, then combine them. And once I've worked out the first test is "$x is between $x_min and $x_max", the second test is much easier to work out.

An alternative way to produce the division is simply by using a line break: 

$x >= $x_min and $x <= $x_max and
$y >= $y_min and $y <= $y_max

[download]
also makes the analogy easier.

In any case, a much nicer way to write an interval test (if you're worried about readability) is to put $x on the inside, and keep all comparisons using the same direction: 

$x_min <= $x and $x <= $x_max and
$y_min <= $y and $y <= $y_max

[download]

In reply to Re: Re: Re: Operator Precedence by ariels
in thread Operator Precedence by tomazos

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.