It means 9*(2^1)+9*(2^0) just like 2b11 means 1*(2^1)+1*(2^0) . J radix constants can have digits larger than the radix. The DoJ addresses this by not explicitly prohibiting it (the DoJ is very efficient :).
In short, the rule for RbDDD where R is the radix and DDDD the digits is '0123456789abcde....z' i. 'DDDD' , independent of R . Try 16bg or 10bzzzzz or 1bthomascostigliola . BTW, 16b_whatever also works. -Dan Please excuse typos; composed on a handheld device. -----Original Message----- From: Thomas Costigliola <[email protected]> Sender: [email protected] Date: Thu, 30 Sep 2010 19:30:34 To: Programming forum<[email protected]> Reply-To: Programming forum <[email protected]> Subject: Re: [Jprogramming] Paid programming contest: Parse J constants What is the meaning of, e.g., 2b99 -: 27? I did find any mention of it in the dictionary. On 9/30/10, Dan Bron <[email protected]> wrote: > Btw, $1 extra credit to Raul for finding a bug in the rules, and > congratulations for being the first on the board. > > -Dan > > PS: Please, indicate when you think you've earned extra credit - I may miss > it otherwise, and JSoftware won't get its due. > > > > > Please excuse typos; composed on a handheld device. > > -----Original Message----- > From: "Dan Bron" <[email protected]> > Sender: [email protected] > Date: Thu, 30 Sep 2010 22:25:20 > To: J Programming<[email protected]> > Reply-To: Programming forum <[email protected]> > Subject: Re: [Jprogramming] Paid programming contest: Parse J constants > > Rule 3 covers_ and__ . > > I had not considered_. . Until we come up with a better idea, you may > represent it as itself. > > -Dan > > > > > Please excuse typos; composed on a handheld device. > > -----Original Message----- > From: Raul Miller <[email protected]> > Sender: [email protected] > Date: Thu, 30 Sep 2010 17:47:36 > To: Programming forum<[email protected]> > Reply-To: Programming forum <[email protected]> > Subject: Re: [Jprogramming] Paid programming contest: Parse J constants > > On Thu, Sep 30, 2010 at 3:55 PM, Dan Bron <[email protected]> wrote: >> The hurdle occurred to me. And I came up with some ideas, but I did >> not want to be too prescriptive; I am hoping to leverage the community's >> creativity. I envisioned an iterative process to resolve such issues. >> (What fun is a competition with no action?) > > How about the numbers_,__ and_. ? > > I will note that the only reliable way to get_. is to > use it directly -- all bets are off if you try to use > computation to get it. > > And it seems, to me, that if you allow_. to represent > itself, that_ and__ would be naturally processed in > the same fashion? > > -- > Raul > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
