On Wed, Jun 01, 2011 at 02:57:41PM -0700, Yingjian Ma wrote: > Hi all, > > 1 I wrote > > (define (p x) > (+ x 10) > (* x 10) > ) > > The result of (p 4) is 40. How can I display 14 and 40?
You could return a list instead of the individual numbers. The way you've coded it, the 14 is computed, then discarded. Then the 40 is computed and returned. In LISP I'd code (list (+ x 10) (* x 10)). I'm not quite sure if 'list' is still called 'list' in Scheme, though; a lot of the built-in function names have changed since the 60's, when I was heavily involved with Lisp. Look it up. -- hendrik _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
