I didn't understand in what file I have to recall using namespace std; statements.
My C++ project contains:
main.cpp
app.cpp
app.h
in app.h I defined class and some constants.
Can I define using namespace std; in the only app.h and recall #include "app.h" inside both main.cpp and app.cpp ?
In this way using namespace std; is how if It's was written in both files?
Thanks