I don't use AIM so I'll just post it up here for ya.. btw, I'm in CIT 230 (object oriented program with JAVA) @ OU...
it looks like most of your problem is with your variables. I was told that you can't use numbers to start your variables. such as...
int 20s bills //this won't work
int bills_20 //this should work
int twenty //this should work too
what are you using for your development environment? if you aren't using it already might i recommend NetBeans 5.5. Its what my prof swears by and i really like it. I just pasted your code into a blank file and it gave me all the errors underlined in red just like MS word does