c vs c++

what is the difference between main() in c & c++?
how c language is interact with hardware?
please reply solution for my problem.

As I know Main() is the entry point of a program...for C,C++ & also in C#.
Without Main() method program can't execute...it is a kind of execution path of a program...
but i also don't know what is the difference.....
please tell me if anyone know about it....

If you want to do "Object oriented programming " C++ will be your choice , for example no classes in 'C '