Beefy Boxes and Bandwidth Generously Provided by pair Networks Frank
Perl-Sensitive Sunglasses
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Just thought I'd try my hand at creating the drop dead most simple examples I could. Doesn't handle errors as nicely.
#Perl5 $rpn = "3 10 * 20 5 / +"; $dig = qr/-?\d+\s+/; $op = qr/[+\-*\/]/; %f = ("+" => sub{$_[0] + $_[1]}, "-" => sub{$_[0] - $_[1]}, "*" => sub{$_[0] * $_[1]}, "/" => sub{$_[0] / $_[1]}); 1 while($rpn =~ s/^(.*?)($dig)($dig)($op)/$1.($f{$4}->($2,$3))/e); print "$rpn\n";
...and...
//Haskell main = print $ foldl eval [] $ words "3 10 * 20 5 / +" -- 34 eval (x:y:xs) "+" = y+x : xs eval (x:y:xs) "-" = y-x : xs eval (x:y:xs) "*" = y*x : xs eval (x:y:xs) "/" = y`div`x : xs eval xs dig = (read dig):xs

In reply to Re: Tales from writing a RPN evaluator in Perl 5, Perl 6 and Haskell by Anonymous Monk
in thread Tales from writing a RPN evaluator in Perl 5, Perl 6 and Haskell by eyepopslikeamosquito

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
  • Outside of code tags, you may need to use entities for some characters:
            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 chilling in the Monastery: (5)
    As of 2014-04-19 00:33 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (473 votes), past polls