Tests for a wide-character code to determine whether it is a punctuation mark such as a comma (,) or a period (.) in the current locale.
#include <wctype.h>
int iswpunct (
wint_t wc);
(IN) Specifies the wide-character code to test.
Returns a nonzero value when the wc argument is a punctuation mark in the current locale. Otherwise, it returns zero.