#include <wctype.h> int iswctype(wint_t wc, wctype_t desc);
If wc is a wide character having the character property designated by desc (or in other words: belongs to the character class designated by desc), the iswctype function returns non-zero. Otherwise it returns zero. If wc is WEOF, zero is returned.
desc must be a character property descriptor returned by the wctype function.
iswctype returns non-zero if the wc has the designated property. Otherwise it returns 0.