为什么MS Visual Studio #include <stdio.h> 默认情况下在stdafx.h中？

Question

MS Visual Studio 2017, new Windows Console Application project from VisualC++ category. The default stdafx.h header includes the following lines:

#include <stdio.h>
#include <tchar.h>

And below them:

// TODO: reference additional headers your program requires here

Because this comment is put below, not above #include <stdio.h> , I am inclined to believe that stdio.h is included by default not as a convenience for the user who would probably #include it anyway, but is for some reason required? The fact that stdio.h is included rather than cstdio only seems to support this interpretation?

AM I right? Can I safely remove #include <stdio.h> ? I'm asking because the very first line in my main function reads:

std::ios_base::sync_with_stdio(false);

Which is obviously incorrect if facilities from stdio are being used anyway, as this header being included would suggest.

1) Can I safely remove the line that says #include <stdio.h> from stdafx.h ?

2) Can I safely call std::ios_base::sync_with_stdio(false) ?

3) Is the fact that tchar.h is also included by default relevant here?

Answer 1

Yes you can remove it.

You can even name your precompiled header not stdafx.h, or disable percompiled header at all.

It is just convenience and example to start with.

Answer 2

Its up to you if you want to use it, however before removing it read on this MSDN about precompiled Header Files

Hope this helps!