I can build and link This project. But the main.c file call test() function, and test() funcion is located in A.c file. Test() function is defined in A.c and declared in A.h. I find main.c not including A.h And all files except A.c don't include A.h file.
I can not understand:why the project can been builded and linked, since that we didn't write A.h sentence in project.
Please help me.