I figured out most of my problem, I'm getting a new problem. It says:
\circle.h [Warning] In function `int main()':
\circle.h`float circle::radius' is private
\apps.cpp within this context

http://go.anothertuesday.com/apps.cpp
http://go.anothertuesday.com/circle.cpp
http://go.anothertuesday.com/circle.h
are the files.