<html> <head> <style> .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } </style> </head> <body class='hmmessage'> Sorry, I should have clarified this exercise is 2.2.4 from www.htdp.org I have had no trouble with previous or later exercises and as I am trying to muddle my way through the text on my lonesome I have no way to easily check my work other then the "yup that works" method... and saddly I have no knowledge of an algebra function that does what this exercise asks... take 3 numbers and spit it out in order of largest to smallest ie 1 2 3 = 321  (hell the only reason I know algebra is the place to look is cause of that darned hint: "Use an algebra book to find out how such a conversion works." Thanks for the quick replies btw...   Travis Stanley > From: clements@brinckerhoff.org > Subject: Re: [plt-scheme] Help: Uber newb > Date: Tue, 8 Jan 2008 19:23:36 -0800 > To: cpt_silverfox@hotmail.com > CC: plt-scheme@list.cs.brown.edu > > > On Jan 8, 2008, at 7:08 PM, William Stanley wrote: > > > Exercise 2.2.4. Define the program convert3. It consumes three > > digits, starting with the least significant digit, followed by the > > next most significant one, and so on. The program produces the > > corresponding number. For example, the expected value of > > (convert3 1 2 3) > > is 321. Use an algebra book to find out how such a conversion works. > > > > > > Okay I had gone past this exercise but as I couldn't figure it out > > it was bugging me... and I must say its been a while since I > > regularly used algebra but after racking my brain for a while and > > googling for even longer I throw myself at your mercy... I am sure > > it is rather simple but I am stumped... sometimes I wish I could > > peek at those answers... even just to see if I got it right. > > > > > > Travis Stanley > > > I hate to be the design-recipe-bot, but... have you tried following > the design recipe? What are the examples you came up with? Are > there simple examples that you know how to do? > > John Clements > <hr />Books, DVD's, gadgets, music and more. <a href='http://shopping.sympatico.msn.ca/content/shp/?ctid=8338,ptnrid=176,ptnrdata=1761116&tcode=HolidayGuide' target='_new'>Shop online with Sympatico / MSN Shopping today!</a></body> </html>