to write a program (in any language)

Would it offend the dear monks if I posted a program in J then? I hope no. (Even though you say any language, that's for the original question, ant this is perlmonks.)

Here's the program: 

spiral =: 3 : 0
>: (,~ y.) $ (i. *: y.) i.~ /: ,/ (-@>.&| , -@{:@*.@(1j_1&*)@j.)"0/~ (
+i. y.) - -:<: y.
)
2!:55[0[ 1!:2&2 spiral 5".>{: ARGV

[download]

To run it,

  1. first get a J User Licence by filling this form;
  2. download J;
  3. set it up by the instructions in readme.txt (comes with the download);
  4. save the above code as spiral.ijs (don't break the long line);
  5. and run jconsole spiral.ijs 5 (5 is an integer giving the spiral size, defaults to 5).
(You can of course skip the first four steps if you have already done them.)

Update 2007 dec 7: better definition for the spiral function is 

spiral =: - ]\ i.@:*: [`]`[} [: \: [: ,/ [: (>.&| , 12&o.@(1j_1&*)@j.)
+"0/~ i. - -:@:<:

[download]

In reply to Re: Spiraling integers by ambrus
in thread Spiraling integers by Elijah

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.