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# iswalnum(3)

`iswalnum` — 宽字符分类工具

## 名称

`iswalnum`, `iswalpha`, `iswascii`, `iswblank`, `iswcntrl`, `iswdigit`, `iswgraph`, `iswhexnumber`, `iswideogram`, `iswlower`, `iswnumber`, `iswphonogram`, `iswprint`, `iswpunct`, `iswrune`, `iswspace`, `iswspecial`, `iswupper`, `iswxdigit`

## 库

Lb libc

## 概要

`#include <wctype.h>`

`Ft int Fn iswalnum wint_t wc Ft int Fn iswalpha wint_t wc Ft int Fn iswascii wint_t wc Ft int Fn iswblank wint_t wc Ft int Fn iswcntrl wint_t wc Ft int Fn iswdigit wint_t wc Ft int Fn iswgraph wint_t wc Ft int Fn iswhexnumber wint_t wc Ft int Fn iswideogram wint_t wc Ft int Fn iswlower wint_t wc Ft int Fn iswnumber wint_t wc Ft int Fn iswphonogram wint_t wc Ft int Fn iswprint wint_t wc Ft int Fn iswpunct wint_t wc Ft int Fn iswrune wint_t wc Ft int Fn iswspace wint_t wc Ft int Fn iswspecial wint_t wc Ft int Fn iswupper wint_t wc Ft int Fn iswxdigit wint_t wc`

## 描述

上述函数是字符分类工具函数，用于宽字符（`wchar_t` 或 `wint_t`）。参见类似命名的单字节分类函数（如 [isalnum(3)](/locale/isalnum.3.md)）的描述以了解详情。

## 返回值

这些函数在字符测试为假时返回零，在字符测试为真时返回非零。

## 参见

[isalnum(3)](/locale/isalnum.3.md), [isalpha(3)](/locale/isalpha.3.md), [isascii(3)](/locale/isascii.3.md), [isblank(3)](/locale/isblank.3.md), [iscntrl(3)](/locale/iscntrl.3.md), [isdigit(3)](/locale/isdigit.3.md), [isgraph(3)](/locale/isgraph.3.md), ishexnumber(3), [isideogram(3)](/locale/isideogram.3.md), [islower(3)](/locale/islower.3.md), isnumber(3), [isphonogram(3)](/locale/isphonogram.3.md), [isprint(3)](/locale/isprint.3.md), [ispunct(3)](/locale/ispunct.3.md), [isrune(3)](/locale/isrune.3.md), [isspace(3)](/locale/isspace.3.md), [isspecial(3)](/locale/isspecial.3.md), [isupper(3)](/locale/isupper.3.md), [isxdigit(3)](/locale/isxdigit.3.md), [wctype(3)](/locale/wctype.3.md)

## 标准

这些函数遵循 IEEE Std 1003.1-2001 ("POSIX.1")，但 `iswascii`、`iswhexnumber`、`iswideogram`、`iswnumber`、`iswphonogram`、`iswrune` 和 `iswspecial` 除外，它们是 FreeBSD 扩展。

## 注意事项

除非参数是 `WEOF` 或当前 locale 中有效的 `wchar_t` 值，否则这些函数的结果未定义。