Control words such as if. must be used within explicit definition.
----- Original Message ----- From: "Hahn, Harvey" <[EMAIL PROTECTED]> Date: Wednesday, February 20, 2008 16:47 Subject: [Jprogramming] Beg Q--"if" spelling error??? To: Programming forum <[email protected]> > I'm stumped--again! > > I was trying to create a series of "if" statements to process > argumentspassed 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.) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
