I think [EMAIL PROTECTED] wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] > Hi all, > > This might seem silly but I **really** cannot figure this one out. > > Is there a jess command/function to convert a string to an integer? > ... > I need to be able to convert the string "25" to an integer to be > able to do some comparisons. > ex (a ?x&:(= ?x 25))
Jess tries hard to convert things automatically between types, if it can. So most of the time, you can just ignore type differences. For instance, (+ 5 "25") gives 30. The only time types really matter is when you want to directly pattern-match on a value; the pattern-matcher compares both the value and type of a thing. The "integer" function accepts any argument that can be converted to a numeric type, and returns a value that really is an integer -- i.e., (integer "25") gives 25. Now, in the little code example above, note that (= 25 "25") returns TRUE -- the "25" is converted to a number automatically. On the other hand, (eq 25 "25") returns FALSE, because the two arguments are of different types. (Caveat: we're talking about Jess 6.1 here. If you've got an earlier version, or a prerelease version, the behavior may be slightly different.) --------------------------------------------------------- Ernest Friedman-Hill Distributed Systems Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
