std::isprint

STD：：

Defined in header
int isprint( int ch

检查ch是按当前安装的C语言环境分类的可打印字符。在默认的“C”区域设置中，以下字符是可打印的：

数字%280123456789%29

大写字母%28ABCDEFGHIJKLMNOPQRSTUVWXYZ%29

小写字母%28abcdefghijklmnopqrstuvwxyz%29

标点符号%28!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~%29

空间%28%29

如果ch不能表示为unsigned char不等于EOF...

参数

ch	-	character to classify

返回值

如果可以打印字符，则为非零值，否则为零。

例

二次

#include <iostream>
#include <cctype>
#include <clocale>
 
int main()
{
    unsigned char c = '\xa0'; // the non-breaking space in ISO-8859-1
 
    std::cout << "isprint(\'\\xa0\', default C locale) returned "
               << std::boolalpha << (bool)std::isprint(c) << '\n';
 
    std::setlocale(LC_ALL, "en_GB.iso88591"
    std::cout << "isprint(\'\\xa0\', ISO-8859-1 locale) returned "
              << std::boolalpha << (bool)std::isprint(c) << '\n';
}

二次

产出：

二次

isprint('\xa0', default C locale) returned false
isprint('\xa0', ISO-8859-1 locale) returned true

二次

另见

isprint(std::locale)	checks if a character is classified as printable by a locale (function template)
iswprint	checks if a wide character is a printing character (function)

C岛文件

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
9	0x09	tab (\t)	≠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
14 - 31	0x0E-0x1F	control codes	≠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
33 - 47	0x21-0x2F	!"#$%&'()*+,-./	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
58 - 64	0x3a-0x40	:;<=>?@	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
71 - 90	0x47-0x5A	GHIJKLMNOPQRSTUVWXYZ	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
103-122	0x67-0x7A	ghijklmnopqrstuvwxyz	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
127	0x7F	backspace character (DEL)	≠0	0	0	0	0	0	0	0	0	0	0

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