It works ok for me: print=: smoutput NB. --unless you actually want hardcopy! humbug 0 We wish you a Merry Christmas We wish you a Merry Christmas We wish you a Merry Christmas And a Happy New Year!
Running a verb always needs an argument (in this case 0) even if the verb doesn't use it. And if you define your verb using (4 : 0) instead of (3 : 0) then it needs 2 arguments: one on either side of the word: 'humbug'. Otherwise you get: |domain error: humbug An expression in J can evaluate to a verb as well as a noun. If you simply type in: humbug this evaluates to a verb, which outputs the verb definition to the IJX window. My guess is, that's what you did. On Fri, Jun 29, 2012 at 7:43 AM, Charles Pechacek <cfp424f...@hotmail.com> wrote: > > > Hello > I have been trying to get a handle on the 'for.' control command, using a > little program taken from a > Pascal book, of which I have written a script as follows: > load 'print' > humbug=: 3 : 0 > for. >: i.3 do. > print 'We wish you a Merry Christmas' > end. > print 'And a Happy New Year!' > ) > Here are the instructions, which I think are relevant, taken from the last > example of section 12.3.7 of 'Learning J': > Another variation is the pattern for. A do. B end. in which block B is > executed as many times as there are items of A. > However, when I run this program, all that results is a copy of the code. > What am I doing wrong? > Thanks in advance. > Charles > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
