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That would be: http://mitpress.mit.edu/sicp/full-text/book/book-Z- H-10.html#%25_thm_1.4 

<<
Exercise 1.4. Observe that our model of evaluation allows for combinations whose operators are compound expressions. Use this observation to describe the behavior of the following procedure: 

(define (a-plus-abs-b a b)
  ((if (> b 0) + -) a b))

<<

...and the point was...?


Gavin Wraith kirjoitti 25.10.2006 kello 22.06:
In message <57a21f730610251113y3df1965i437da33d821d718e@mail.gmail.com> 
you wrote:


-- Like C/Perl "cond ? a : b" operator, done using Lua scripts.


maybe it's obvious, but one difference is that unlike C and Perl,
tricond always evaluates both expressions?

also, tricond doesn't seem to allow false and nil as the value of
either expression?


See Exercise 1.4 in SICP.
--
Gavin Wraith (gavin@wra1th.plus.com)
Home page: http://www.wra1th.plus.com/