std::isspace
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| 在头文件 <cctype> 中定义
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| int isspace( int ch ); |
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。如果给定的字符被归类为空白字符的检查当前安装的C语言环境。在默认的语言环境中,空白字符是空格(
0x20),进纸(0x0c),换行(0x0a),回车(0x0d),水平制表符(0x09)和垂直制表符(0x0b).原文:
Checks if the given character is classified as a whitespace character by the currently installed C locale. In the default locale, the whitespace characters are space (
0x20), form feed (0x0c), line feed (0x0a), carriage return (0x0d), horizontal tab (0x09) and vertical tab (0x0b).[编辑] 。参数。
| ch | - | 。字符。
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===。 返回值。===
。非0值(true)如果字符是一个空白字符,
0(false),否则.原文:
Non-zero value (true) if the character is a whitespace character,
0 (false) otherwise.[编辑] 。另请参阅。
| 检查,如果被归类为空白字符的语言环境 原文: checks if a character is classified as whitespace by a locale (函数模板) | |
| 检查是否使用了一个宽字符是一个空格字符 原文: checks if a wide character is a space character (函数) | |
| C documentation for isspace
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| ASCII values (hex) |
characters |
isspace |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
|
0
|
0
|
0
|
0
|
0
|
0
|
| 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
|
0
|
0
|
0
|
0
|
0
|
0
|
| 10 - 13 | 0x0A-0x0D
|
whitespaces (\n,\v,\f,\r)
|
≠0
|
0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 14 - 31 | 0x0E-0x1F
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control codes | ≠0
|
0
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0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 32 | 0x20
|
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
|
!"#$%&'()*+,-./
|
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
|
0
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≠0
|
0
|
0
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≠0
|
0
|
≠0
|
0
|
0
|
0
|
≠0
|
≠0
|
| 58 - 64 | 0x3a-0x40
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:;<=>?@
|
0
|
≠0
|
0
|
0
|
≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 65 - 70 | 0x41-0x46
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ABCDEF
|
0
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≠0
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0
|
0
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≠0
|
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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| 71 - 90 | 0x47-0x5A
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GHIJKLMNOPQRSTUVWXYZ
|
0
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≠0
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0
|
0
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≠0
|
0
|
≠0
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≠0
|
≠0
|
0
|
0
|
0
|
| 91 - 96 | 0x5B-0x60
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[\]^_`
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 97 -102 | 0x61-0x66
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abcdef
|
0
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≠0
|
0
|
0
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≠0
|
0
|
≠0
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≠0
|
0
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≠0
|
0
|
≠0
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| 103-122 | 0x67-0x7A
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ghijklmnopqrstuvwxyz
|
0
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≠0
|
0
|
0
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≠0
|
0
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≠0
|
≠0
|
0
|
≠0
|
0
|
0
|
| 123-126 | 0x7B-0x7E
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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
|
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
|
0
|
0
|
0
|
0
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