std::iswdigit(3) C++ Standard Libary std::iswdigit(3) NAME std::iswdigit - std::iswdigit Synopsis Defined in header <cwctype> int iswdigit( wint_t ch ); Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined. Parameters ch - wide character Return value Non-zero value if the wide character is a numeric character, zero other- wise. Notes std::iswdigit and std::iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale. Example Some locales offer additional character classes that detect non-ASCII digits // Run this code #include <clocale> #include <cwctype> #include <iostream> void test(wchar_t a3, wchar_t u3, wchar_t j3) { std::wcout << std::boolalpha << "\t '" << a3 << "' '" << u3 << "' '" << j3 << "'\n" << "iswdigit: " << (bool)std::iswdigit(a3) << " " << (bool)std::iswdigit(u3) << " " << (bool)std::iswdigit(j3) << '\n' << "jdigit: " << (bool)std::iswctype(a3, std::wctype("jdigit")) << ' ' << (bool)std::iswctype(u3, std::wctype("jdigit")) << ' ' << (bool)std::iswctype(j3, std::wctype("jdigit")) << '\n'; } int main() { wchar_t a3 = L'3'; // the ASCII digit 3 wchar_t u3 = L'a,'; // the CJK numeral 3 wchar_t j3 = L'i1/4'; // the full-width digit 3 std::setlocale(LC_ALL, "en_US.utf8"); std::wcout << "In American locale:\n"; test(a3, u3, j3); std::wcout << "\nIn Japanese locale:\n"; std::setlocale(LC_ALL, "ja_JP.utf8"); test(a3, u3, j3); } Possible output: In American locale: '3' 'a,' 'i1/4' iswdigit: true false false jdigit: false false false In Japanese locale: '3' 'a,' 'i1/4' iswdigit: true false false jdigit: false false true See also isdigit(std::locale) checks if a character is classified as a digit by a locale (function template) isdigit checks if a character is a digit (function) C documentation for iswdigit ASCII values characters iscntrl isprint isspace isblank isgraph ispunct isalnum isalpha isupper islower isdigit isxdigit decimal hexadecimal octal iswcntrl iswprint iswspace iswblank iswgraph iswpunct iswalnum iswalpha iswupper iswlower iswdigit iswxdigit 0a8 \x0a\x8 \0a\10 control codes a 0 0 0 0 0 0 0 0 0 0 0 0 (NUL, etc.) 9 \x9 \11 tab (\t) a 0 0 a 0 a 0 0 0 0 0 0 0 0 0 whitespaces 10a13 \xAa\xD \12a\15 (\n, \v, \f, a 0 0 a 0 0 0 0 0 0 0 0 0 0 \r) 14a31 \xEa\x1F \16a\37 control codes a 0 0 0 0 0 0 0 0 0 0 0 0 32 \x20 \40 space 0 a 0 a 0 a 0 0 0 0 0 0 0 0 0 33a47 \x21a\x2F \41a\57 !"#$%&'()*+,-./ 0 a 0 0 0 a 0 a 0 0 0 0 0 0 0 48a57 \x30a\x39 \60a\71 0123456789 0 a 0 0 0 a 0 0 a 0 0 0 0 a 0 a 0 58a64 \x3Aa\x40 \72a\100 :;<=>?@ 0 a 0 0 0 a 0 a 0 0 0 0 0 0 0 65a70 \x41a\x46 \101a\106 ABCDEF 0 a 0 0 0 a 0 0 a 0 a 0 a 0 0 0 a 0 71a90 \x47a\x5A \107a\132 GHIJKLMNOP 0 a 0 0 0 a 0 0 a 0 a 0 a 0 0 0 0 QRSTUVWXYZ 91a96 \x5Ba\x60 \133a\140 [\]^_` 0 a 0 0 0 a 0 a 0 0 0 0 0 0 0 97a102 \x61a\x66 \141a\146 abcdef 0 a 0 0 0 a 0 0 a 0 a 0 0 a 0 0 a 0 103a122 \x67a\x7A \147a\172 ghijklmnop 0 a 0 0 0 a 0 0 a 0 a 0 0 a 0 0 0 qrstuvwxyz 123a126 \x7Ba\x7E \172a\176 {|}~ 0 a 0 0 0 a 0 a 0 0 0 0 0 0 0 127 \x7F \177 backspace a 0 0 0 0 0 0 0 0 0 0 0 0 character (DEL) http://cppreference.com 2024.06.10 std::iswdigit(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Possible output: | See also
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