In C/C++, the function of iswpunct() function is to determine whether a wide character is a punctuation mark.

int iswpunct(wint_t character);

#include<cwctype>
#include<stdio.h>
using namespace std;
int main() {
   wint_t a = &#39;!&#39;;
   wint_t b = &#39;a&#39;;
   if(iswpunct(a))
   printf("The character is a punctuation.");
   else
   printf("\nThe character is not a punctuation.");
   if(iswpunct(b))
   printf("\nThe character is a punctuation.");
   else
   printf("\nThe character is not a punctuation.");
   return 0;
}

The character is a punctuation.
The character is not a punctuation.

wint_t a = '!';
wint_t b = 'a';
if(iswpunct(a))
printf("The character is a punctuation.");
else
printf("\nThe character is not a punctuation.");
if(iswpunct(b))
printf("\nThe character is a punctuation.");
else
printf("\nThe character is not a punctuation.");