std::isxdigit
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| 在头文件 <cctype> 中定义
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| int isxdigit( int ch ); |
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。检查是否给定的宽字符是十六进制数字字符(
0123456789abcdefABCDEF).原文:
Checks if the given wide character is a hexadecimal numeric character (
0123456789abcdefABCDEF).[编辑] 。参数。
| ch | - | 。字符。
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===。 返回值。===
。非零值(true),如果字符是十六进制数字字符,
0(false),否则.原文:
Non-zero value (true) if the character is an hexadecimal numeric character,
0 (false) otherwise.[编辑] 。注释。
。
isdigitisxdigit的唯一标准窄字符分类功能,不会影响当前安装的C语言环境。但也有一些实现(例如,Microsoft在1252字码页)分类额外的单字节字符作为数字. 原文:
isdigit and isxdigit are the only standard narrow character classification functions that are not affected by the currently installed C locale. although some implementations (e.g. Microsoft in 1252 codepage) may classify additional single-byte characters as digits. [编辑] 。另请参阅。
| 检查,如果一个字符被归类为一个十六进制数字的语言环境 原文: checks if a character is classified as a hexadecimal digit by a locale (函数模板) | |
| 检查,如果一个字符是十六进制的字符 原文: checks if a character is a hexadecimal character (函数) | |
| C documentation for isxdigit
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| ASCII values (hex) |
characters |
isxdigit | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 - 8 | 0x00-0x08
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control codes (NUL, etc.)
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≠0
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0
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0
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0
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0
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0
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0
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0
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0
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0
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0
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0
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| 9 | 0x09
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tab (\t)
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≠0
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0
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≠0
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≠0
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0
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0
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0
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0
|
0
|
0
|
0
|
0
|
| 10 - 13 | 0x0A-0x0D
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whitespaces (\n,\v,\f,\r)
|
≠0
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0
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≠0
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0
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0
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0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 14 - 31 | 0x0E-0x1F
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control codes | ≠0
|
0
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0
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0
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0
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0
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0
|
0
|
0
|
0
|
0
|
0
|
| 32 | 0x20
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space | 0
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≠0
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≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 33 - 47 | 0x21-0x2F
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!"#$%&'()*+,-./
|
0
|
≠0
|
0
|
0
|
≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 48 - 57 | 0x30-0x39
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0123456789
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0
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≠0
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0
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0
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≠0
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0
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≠0
|
0
|
0
|
0
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≠0
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≠0
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| 58 - 64 | 0x3a-0x40
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:;<=>?@
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0
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≠0
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0
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0
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≠0
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≠0
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0
|
0
|
0
|
0
|
0
|
0
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| 65 - 70 | 0x41-0x46
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ABCDEF
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0
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≠0
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0
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0
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≠0
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0
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≠0
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≠0
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≠0
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0
|
0
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≠0
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| 71 - 90 | 0x47-0x5A
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GHIJKLMNOPQRSTUVWXYZ
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0
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≠0
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0
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0
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≠0
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0
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≠0
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≠0
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≠0
|
0
|
0
|
0
|
| 91 - 96 | 0x5B-0x60
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[\]^_`
|
0
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≠0
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0
|
0
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≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
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| 97 -102 | 0x61-0x66
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abcdef
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0
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≠0
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0
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0
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≠0
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0
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≠0
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≠0
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0
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≠0
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0
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≠0
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| 103-122 | 0x67-0x7A
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ghijklmnopqrstuvwxyz
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0
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≠0
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0
|
0
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≠0
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0
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≠0
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≠0
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0
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≠0
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0
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0
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| 123-126 | 0x7B-0x7E
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{|}~
|
0
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≠0
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0
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0
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≠0
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≠0
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0
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0
|
0
|
0
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0
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0
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| 127 | 0x7F
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backspace character (DEL)
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≠0
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0
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0
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0
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0
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0
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0
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0
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0
|
0
|
0
|
0
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