C

iswalpha

iswalpha

在头文件中定义
int iswalpha(wint_t ch);(自C95以来)

检查给定的宽字符是否为字母字符,即大写字母(ABCDEFGHIJKLMNOPQRSTUVWXYZ),小写字母(abcdefghijklmnopqrstuvwxyz)或特定于当前语言环境的任何字母字符。

参数

CH-宽字符

返回值

如果宽字符是字母字符,则为非零值,否则为零。

#include <stdio.h> #include <wchar.h> #include <wctype.h> #include <locale.h> int main(void) { wchar_t c = L'\u0b83'; // Tamil sign Visarga ('ஃ') printf("in the default locale, iswalpha(%#x) = %d\n", c, !!iswalpha(c) setlocale(LC_ALL, "en_US.utf8" printf("in Unicode locale, iswalpha(%#x) = %d\n", c, !!iswalpha(c) }

输出:

in the default locale, iswalpha(0xb83) = 0 in Unicode locale, iswalpha(0xb83) = 1

参考

  • C11标准(ISO / IEC 9899:2011):

扩展内容

isalpha检查一个字符是否是字母(功能)

| 用于iswalpha的C ++文档 |

ASCII 值 (十六进制)字符iscntrl iswcntrl.isprint iswprint.isspace iswspace.isblank iswblank.isgraph iswgraph.ispunct iswpunct.isalnum iswalnum.isalpha iswalpha.isupper iswupper.islower iswlower.isdigit iswdigit.isxdigit iswxdigit.
0 - 80x00-0x08控制码 (NUL, etc.)≠00000000000
90x09tab (\t)≠00≠0≠00000000
10 - 130x0A-0x0D空格 (\n,\v,\f,\r)≠00≠000000000
14 - 310x0E-0x1F控制码≠00000000000
320x20space0≠0≠0≠00000000
33 - 470x21-0x2F!"#$%&'()*+,-./0≠000≠0≠000000
48 - 570x30-0x3901234567890≠000≠00≠0000≠0
58 - 640x3a-0x40:;<=>?@0≠000≠0≠000000
65 - 700x41-0x46ABCDEF0≠000≠00≠0≠0≠000
71 - 900x47-0x5AGHIJKLMNOPQRSTUVWXYZ0≠000≠00≠0≠0≠000
91 - 960x5B-0x60[]^_` | 0 | ≠0 | 0 | 0 | ≠0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 |
97 -1020x61-0x66abcdef0≠000≠00≠0≠00≠00
103-1220x67-0x7Aghijklmnopqrstuvwxyz0≠000≠00≠0≠00≠00
123-1260x7B-0x7E{|}~0≠000≠0≠000000
1270x7F退格 (DEL)≠00000000000