Compares not more than maxchar characters of two wide-character
    strings. It returns an integer that indicates if the strings are
    different, and how they differ.

    Format

      #include  <wchar.h>

      int wcsncmp  (const wchar_t *wstr_1, const wchar_t *wstr_2,
                   size_t maxchar);

  Additional Information (explode) :

• Arguments
• Description
• Return Values