I just want to add that there's a fundamental difference between C and Perl that makes "code disabling" preprocessor directives in Perl unnecessary.

C is a compiled language, and preprocessor is for the *compiler*. What's #ifdef-ed out won't show up in the compiled code at all. This can boost performance and reduce the executable file size especially for multiplatform apps.

Perl is not compiled, at least not in the sense C is, so it doesn't need such complications. A simple if (0) is good enough to exclude code from running. No preprocessor directive will make your code smaller to carry aroung.


In reply to Re: Using Pre-processor directive in Perl by spurperl
in thread Using Pre-processor directive in Perl by cr_ashok

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.