Indicates if a wide character is classed as a graphic character
    in the program's current locale.
    Format
      #include  <wctype.h> (ISO C)
      #include  <wchar.h> (XPG4)
      int iswgraph  (wint_t wc);
1 – Argument
 wc
    An object of type wint_t. The value of wc must be representable
    as a wchar_t in the current locale, or must equal the value
    of the macro WEOF. If it has any other value, the behavior is
    undefined.
2 – Return Values
    nonzero            If a graphic character.
    0                  If not a graphic character.