c:\documents and settings\administrator\desktop\project software\of-eval-1.0\of-eval\of_implementations\proesmans\proesmans.h(7) : fatal error C1083: Cannot open include file: 'values.h': No such file or directory
main.c
simply means that you have added an
#include "values.h"
in your
proesmans.h
file, but the compiler cannot find the header. If you really do not understand this then I think you may need to go back to your C++ documentation.
Second question: No, there is no problem having multiple sources in a project, most applications have that.