std::iscntrl

 

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字符串库

null结尾的字符串 Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

字节的字符串

多字节字符串

宽字符串

类 Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

NULL结尾的字节串

功能 Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
字符操作 Original: Character manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isalnum isalpha islower isupper isdigit isxdigit isblank （C++11）	iscntrl isgraph isspace isprint ispunct tolower toupper
转换为数字格式 Original: Conversions to numeric formats The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
atof atoi atol atoll strtol strtoll	strtoul strtoull strtof strtod strtold
字符串操作 Original: String manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strcpy
strncpy
strcat
strncat
strxfrm
字符串检查 Original: String examination The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strlen strcmp strncmp strcoll strchr strrchr	strspn strcspn strpbrk strstr strtok
内存操作 Original: Memory manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
memchr
memcmp
memset
memcpy
memmove
杂项 Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strerror

 

Defined in header <cctype>
int iscntrl( int ch );

当前安装的C语言环境被列为检查，如果给定的字符是控制字符。在默认的C语言环境，控制字符的字符代码0x00-0x1F和0x7F.

Original:

Checks if the given character is classified as a control character by the currently installed C locale. In the default C locale, the control characters are the characters with the codes 0x00-0x1F and 0x7F.

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参数

ch

-

字符 Original: character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

非0值（true）如果字符是控制字符，0（false），否则.

Original:

Non-zero value (true) if the character is a control character, 0 (false) otherwise.

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为例

#include <iostream>
#include <cctype>
#include <clocale>
 
int main()
{
    char c = '\x94'; // the control code CCH in ISO-8859-1
 
    std::cout << "iscntrl(\'\\x94\', default C locale) returned "
               << std::boolalpha << (bool)std::iscntrl(c) << '\n';
 
    std::setlocale(LC_ALL, "en_GB.iso88591");
    std::cout << "iscntrl(\'\\x94\', ISO-8859-1 locale) returned "
              << std::boolalpha << (bool)std::iscntrl(c) << '\n';
 
}

Output:

iscntrl('\x94', default C locale) returned false
iscntrl('\x94', ISO-8859-1 locale) returned true

另请参阅

iscntrl(std::locale)	如果一个字符被列为检查的控制字符的语言环境 Original: checks if a character is classified as a control character by a locale The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
iswcntrl	检查，如果一个宽字符是一个控制字符 Original: checks if a wide character is a control character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
C documentation for iscntrl

ASCII values (hex)		characters	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 - 8	0x00-0x08	control codes (NUL, etc.)	≠0	0	0	0	0	0	0	0	0	0	0	0
9	0x09	tab (\t)	≠0	0	≠0	≠0	0	0	0	0	0	0	0	0
10 - 13	0x0A-0x0D	whitespaces (\n,\v,\f,\r)	≠0	0	≠0	0	0	0	0	0	0	0	0	0
14 - 31	0x0E-0x1F	control codes	≠0	0	0	0	0	0	0	0	0	0	0	0
32	0x20	space	0	≠0	≠0	≠0	0	0	0	0	0	0	0	0
33 - 47	0x21-0x2F	!"#$%&'()*+,-./	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
48 - 57	0x30-0x39	0123456789	0	≠0	0	0	≠0	0	≠0	0	0	0	≠0	≠0
58 - 64	0x3a-0x40	:;<=>?@	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
65 - 70	0x41-0x46	ABCDEF	0	≠0	0	0	≠0	0	≠0	≠0	≠0	0	0	≠0
71 - 90	0x47-0x5A	GHIJKLMNOPQRSTUVWXYZ	0	≠0	0	0	≠0	0	≠0	≠0	≠0	0	0	0
91 - 96	0x5B-0x60	[\]^_`	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
97 -102	0x61-0x66	abcdef	0	≠0	0	0	≠0	0	≠0	≠0	0	≠0	0	≠0
103-122	0x67-0x7A	ghijklmnopqrstuvwxyz	0	≠0	0	0	≠0	0	≠0	≠0	0	≠0	0	0
123-126	0x7B-0x7E	{|}~	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
127	0x7F	backspace character (DEL)	≠0	0	0	0	0	0	0	0	0	0	0	0