Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

A few days back I wrote a prime generator just because I hadn't done it in a while. I thought it came out pretty nice. It caches the primes that it finds and uses them for finding the new ones (that is, it uses the algorithm discussed by other monks: checking each candidate against primes less than the candidate's square root). Here it is:

use strict; use warnings; my @primes = ( 2, 3 ); my $candidate = $primes[-1] + 2; my $max_prime = shift || 100_000; CANDIDATE: while ( $candidate < $max_prime ) { my $sqrt_candidate = sqrt $candidate; PRIME: foreach my $prime ( @primes ) { last PRIME if $prime > $sqrt_candidate; next CANDIDATE if 0 == $candidate % $prime; } push @primes, $candidate; } continue { $candidate += 2; } print join q{,}, @primes; print "\n";

In reply to Re: ulam's spiral too slow by kyle
in thread ulam's spiral too slow by orange

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • 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 or How to display code and escape characters are good places to start.
Log In?

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

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (4)
As of 2021-07-26 16:04 GMT
Find Nodes?
    Voting Booth?

    No recent polls found