iswxdigit

Header: <wctype.h>

Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of 0123456789abcdefABCDEF.

# Declarations

int iswxdigit( wint_t ch );

(since C95)

# Parameters

# Return value

Non-zero value if the wide character is a hexadecimal numeric character, zero otherwise.

# Notes

iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.

# Example

#include <locale.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
 
void test(wchar_t a3, wchar_t u3, wchar_t j3)
{
    printf("\t  '%lc'  '%lc' '%lc'\n", a3, u3, j3);
    printf("iswxdigit: %d    %d    %d\n",
           !!iswxdigit(a3),
           !!iswxdigit(u3),
           !!iswxdigit(j3));
    printf("jdigit:    %d    %d    %d\n",
           !!iswctype(a3, wctype("jdigit")),
           !!iswctype(u3, wctype("jdigit")),
           !!iswctype(j3, wctype("jdigit")));
}
 
int main(void)
{
    wchar_t a3 = L'9';  // the ASCII digit 9
    wchar_t u3 = L'〩'; // the CJK numeral 9
    wchar_t j3 = L'９'; // the full-width digit 9
 
    setlocale(LC_ALL, "en_US.utf8");
    puts("In American locale:");
    test(a3, u3, j3);
 
    setlocale(LC_ALL, "ja_JP.utf8");
    puts("\nIn Japanese locale:");
    test(a3, u3, j3);
}

# See also