You do not have to take any special steps to include standard system C header files, such as stdio.h. The standard C header files already contain the appropriate extern "C" directives. For example:

#include <stdio.h>
int main()
{
    ...       // C++ code
    return 0;
}

If you include headers using this syntax, all library names are placed in the global namespace.

The C++ standard specifies that the functionality of the C header files is available through C++ specific header files. These files are installed in install_directory\RVCT\Data\3.0\build_num\include\platform, together with the standard C header files, and can be referenced in the usual way. For example:

#include <cstdio>

In ARM C++, these headers #include the C headers. If you include headers using this syntax, all C++ standard library names are defined in the namespace std, including the C library names. This means that you must qualify all the library names by using one of the following methods: