std::isgraph

STD：：等值线

Defined in header
int isgraph( int ch

检查给定字符是否为图形%28，是否有按当前安装的C语言环境分类的图形表示形式%29。在默认的C语言环境中，下列字符是图形的：

数字%280123456789%29

大写字母%28ABCDEFGHIJKLMNOPQRSTUVWXYZ%29

小写字母%28abcdefghijklmnopqrstuvwxyz%29

标点符号%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

如果字符具有图形表示字符，则为非零值，否则为零。

例

二次

#include <iostream>
#include <cctype>
#include <clocale>
 
int main()
{
    unsigned char c = '\xb6'; // the character ¶ in ISO-8859-1
 
    std::cout << "isgraph(\'\\xb6\', default C locale) returned "
               << std::boolalpha << (bool)std::isgraph(c) << '\n';
 
    std::setlocale(LC_ALL, "en_GB.iso88591"
    std::cout << "isgraph(\'\\xb6\', ISO-8859-1 locale) returned "
              << std::boolalpha << (bool)std::isgraph(c) << '\n';
}

二次

产出：

二次

isgraph('\xb6', default C locale) returned false
isgraph('\xb6', ISO-8859-1 locale) returned true

二次

另见

isgraph(std::locale)	checks if a character is classfied as graphical by a locale (function template)
iswgraph	checks if a wide character is a graphical character (function)

等值线图的C文档

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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