-int mblen( const char * s, size_t n );
-size_t mbstowcs( wchar_t * restrict wcs, const char * restrict s, size_t n );
-int mbtowc( wchar_t * restrict pwc, const char * restrict s, size_t n );
-size_t wcstombs( char * restrict s, const wchar_t * restrict wcs, size_t n );
-int wctomb( char * s, wchar_t wchar );
+div_t div( int numer, int denom );
+ldiv_t ldiv( long int numer, long int denom );
+lldiv_t lldiv( long long int numer, long long int denom );