iswdigit - cppreference.com (original) (raw)

| | | | | --------------------------- | | ----------- | | int iswdigit( wint_t ch ); | | (since C95) |

Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789.

[edit] Parameters

[edit] Return value

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

[edit] Notes

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

[edit] Example

Some locales offer additional character classes that detect non-ASCII digits

#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("iswdigit: %d  %d  %d\n", !!iswdigit(a3), !!iswdigit(u3), !!iswdigit(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'3'; // the ASCII digit 3 wchar_t u3 = L'三'; // the CJK numeral 3 wchar_t j3 = L'３'; // the full-width digit 3   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); }

Possible output:

In American locale: '3' '三' '３' iswdigit: 1 0 0 jdigit: 0 0 0   In Japanese locale: '3' '三' '３' iswdigit: 1 0 0 jdigit: 0 0 1

[edit] References

[edit] See also

ASCII values characters iscntrl iswcntrl isprint iswprint isspace iswspace isblank iswblank isgraph iswgraph ispunct iswpunct isalnum iswalnum isalpha iswalpha isupper iswupper islower iswlower isdigit iswdigit isxdigit iswxdigit
decimal hexadecimal octal
0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
14–31 \xE–\x1F \16–\37 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0
33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
48–57 \x30–\x39 \60–\71 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0
58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
65–70 \x41–\x46 \101–\106 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0
71–90 \x47–\x5A \107–\132 GHIJKLMNOPQRSTUVWXYZ 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
91–96 \x5B–\x60 \133–\140 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
97–102 \x61–\x66 \141–\146 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0
103–122 \x67–\x7A \147–\172 ghijklmnopqrstuvwxyz 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
123–126 \x7B–\x7E \173–\176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
127 \x7F \177 backspace character (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0