Here are a few title options, playing with the question format and focusing on the key aspects of the article: Option 1: (Direct & Informative) * Why Does Including stdio.h Affect Both the Glob

cstdio and stdio.h Namespace

The C Standard Library houses various headers within the std namespace. However, there's a unique aspect regarding headers originating from the C language.

Implication of stdio.h and stdio.h

Including the cstdio header imports symbols both in the std namespace and potentially the global namespace. Conversely, including stdio.h adds symbols to the global namespace and possibly the std namespace. This applies to all C-style headers.

The Annex D Exception

The C 11 standard, in Annex D, provides compatibility features related to C standard library headers. It specifies:

"Every C header, each of which has a name of the form name.h, behaves as if each name placed in the standard library namespace by the corresponding cname header is placed within the global namespace scope."

In other words, C-style headers like stdio.h import symbols both in the std and global namespaces, ensuring compatibility with C.

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