[Jprogramming] Beg Q--"if" spelling error???

[Hahn, Harvey]

I'm stumped--again!

I was trying to create a series of "if" statements to process arguments
passed to a J script (standalone app).  In the statement, "if. A do. B
end.", I tested and know that statements A and B are constructed
correctly and work properly (that is, they have the proper syntax,
values, etc.).  But I kept getting an error message every time the
script reached the "if" statements.  I decided to switch over to the
interpreter and see if I could figure out what's going on.  That's when
things really blew my mind!

In order to create a tiny example for your perusal of what was going on,
I made the "A" value above always be true (value of 1, based on what was
returned by J when I typed a true mathematical statement) and stuck in a
simple display action for the "B" value above.  Here's my example and
the J interpreter's response:

   if. 1 do. wdinfo 'success' end.
|spelling error
|      if. 1 do. wdinfo 'success' end.
|      ^

How can there be a "spelling error"???  "if." is exactly what is
described in the "control structures" section of the Vocabulary.  OK, so
I decided that, since x, y, and other characters dropped their
terminating periods starting in J601, I'd try do the same with the words
in the "if" structure:

   if 1 do wdinfo 'success' end  <-- dialog box displays followed by:
|value error: if
|       if 1 do wdinfo'success'end

Interestingly, it *worked*!  Or I should say that it sort of worked:
when I pressed the Enter key, the expected dialog box displayed, but,
when I clicked the "OK" button, the error message above appeared.

Help!  I don't know what's happening or why.  I tried to follow the
proper spelling and syntax of the "if" structure, but it doesn't seem to
work as documented.  Any ideas???  Thanks!  (BTW, I'm running J601c.)

Harvey