Inputs one wide character from the standard input file (stdin).
[Format]
#include <wchar.h>
long getwchar(void);
[Return values]
Normal: End-of-file: WEOF
Otherwise: Input wide character
Abnormal: EOF
[Remarks]
When a read error occurs, the error indicator for that file is set.
The getwchar function is the wide-character version of the getchar function.