Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
You don't, because doing so would violate the guarantee that you cannot buffer overflow in Perl. But, there are good reasons why C gives you the rope to buffer overflow.

Let's say you want to iterate through the characters of a string and do something with each character. In C, that's pretty simple. Strings are just arrays of characters and arrays are just fancy pointers.

char string[] = "Hello"; char *ptr; fr ( ptr = string; *ptr; ptr++ ) { do_something_with( *ptr ); // This is a single char }
Now, let's say you want to do the same thing in Perl. There's a few ways, but none are anywhere as efficient.
foreach my $char ( split //, $string ) { ... } while ( $string =~ /(.)/g ) { my $char = $1; ... } for ( my $i = 0; $i <= length $string; $i++ ) { my $char = substr( $st +ring, $index, 1 ); ... }

In reply to Re^3: The Concept of References by dragonchild
in thread The Concept of References by leriksen

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!
  • 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, 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, 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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others musing on the Monastery: (9)
    As of 2015-07-29 23:44 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (269 votes), past polls