iswdigit - Test for decimal-digit wide character

Definition	#include <wctype.h> int iswdigit(wint_t wc); iswdigit tests whether the wide character wc is a decimal digit. In all cases, wc is an argument of type wint_t, the value of which must be a wide character code corresponding to a valid character in the current locale or must equal the value of the macro WEOF. If the argument wc has any other value, the behavior is undefined.
Return val.	!= 0 0	wc is a decimal digit. wc is not a decimal digit.
Notes	This version of the C runtime system only supports one-byte characters as wide character codes. iswdigit is implemented both as a function and as a macro (see section “Functions and macros”). The behavior of iswdigit is determined by the class digit of the current locale. The current locale is the C locale, unless it was explicitly changed using setlocale.
See also	isdigit, iswalnum, iswalpha, iswcntrl, iswgraph, iswlower, iswprint, iswpunct, iswspace, iswupper, iswxdigit