Hi all, I have been steadily working through Haskell SOE. However, as the exercises become more involved, I would like to know, not only that the answer I come up with works, but that I am doing it the right way (the elegant way?). For instance, Chapter 8 Exercise 8.3 requires me to modify the "area" and "perimeter" functions to accept negative arguments. My solution would be to change the functions to take the absolute value of the arguments as they come in. This would work but it doesn't seem all that elegant. Additionally, SOE exercises do not come with test data so I can test correctness. Is it part of my responsibililty as a student to come up with test data (boundary conditions etc) as I try to answer the questions? Is there some kind of solutions manual available? I promise I am not doing this as homework for a course. Thanks... Deech _________________________________________________________________ Find a local pizza place, music store, museum and moreĀ then map the best route! http://local.live.com?FORM=MGA001