c++ Makefile demo

there are three files: T.h , T.cpp and main.cpp .I wanna get a executive file named demo,I can vi this Makefile as follows:

 

1. demo:main.o T.o
2.         g++ *.o -o demo
3. T.o:T.h T.cpp
4.         g++ -c T.cpp
5. main.o:main.cpp
6.         g++ -c main.cpp
7. #T.o:T.h T.cpp
8. #       g++ -c T.cpp
9. clean:
10.         rm -f *.o