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std::iswdigit

提供: cppreference.com
< cpp‎ | string‎ | wide

ヘッダ <cwctype> で定義
int iswdigit( wint_t ch );
かどうかをチェックし指定されたワイド文字対応(絞られている場合)10進数字文字0123456789の一つに.
Original:
Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

目次

[編集] パラメータ

ch -
ワイド文字
Original:
wide character
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[編集] 値を返します

ワイド文字が数字の場合、非ゼロ値(true)、0false)その他のとき.
Original:
Non-zero value (true) if the wide character is an numeric character, 0 (false) otherwise.
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[編集] ノート

iswdigitiswxdigit現在インストールされているCロケールには影響されません唯一の標準的なワイド文字分類関数です.
Original:
iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.
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[編集]

ロケールによっては、非ASCII数字を検出追加の文字クラスを提供します
Original:
Some locales offer additional character classes that detect non-ASCII digits
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#include <iostream>
#include <cwctype>
#include <clocale>
void test(wchar_t a3, wchar_t u3, wchar_t j3)
{
    std::wcout << std::boolalpha
               << "          '" << 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'三'; // the CJK numeral 3
    wchar_t j3 = L'3'; // the fullwidth 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);
}

出力:

In american locale:
          '3'   '三'  '3'
iswdigit true  false false
jdigit:  false false false
 
In japanese locale:
          '3'   '三'  '3'
iswdigit true  false false
jdigit:  false false true

[編集] 参照

指定されたロケールにおいて文字が数字に分類されるかどうか調べます
(関数テンプレート) [edit]
文字が数字かどうか調べます
(関数) [edit]
ASCII値 文字

iscntrl
iswcntrl

isprint
iswprint

isspace
iswspace

isblank
iswblank

isgraph
iswgraph

ispunct
iswpunct

isalnum
iswalnum

isalpha
iswalpha

isupper
iswupper

islower
iswlower

isdigit
iswdigit

isxdigit
iswxdigit

10進 16進 8進
0–8 \x0\x8 \0\10 制御文字 (NUL など) ≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 タブ (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
10–13 \xA\xD \12\15 ホワイトスペース (\n, \v, \f, \r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
14–31 \xE\x1F \16\37 制御文字 ≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 空白 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 GHIJKLMNOP
QRSTUVWXYZ
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 ghijklmnop
qrstuvwxyz
0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
123–126 \x7B\x7E \172\176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
127 \x7F \177 削除文字 (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0
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