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在头文件<ctype.h>中定义 | ||
---|---|---|
int isgraph(int ch); |
检查给定字符是否具有图形表示形式,即它是数字(0123456789
),大写字母(ABCDEFGHIJKLMNOPQRSTUVWXYZ
),小写字母(abcdefghijklmnopqrstuvwxyz
)或标点符号(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
)或特定于当前C语言环境的图形字符。
如果ch的值不能表示为unsigned char并且不等于EOF,则行为是未定义的。
ch | - | 分类字符 |
---|
如果字符具有图形表示字符则为非零值,否则为零。
#include <stdio.h>#include <ctype.h>#include <locale.h> int main(void){ unsigned char c = '\xb6'; // the character ¶ in ISO-8859-1 printf("In the default C locale, \\xb6 is %sgraphical\n", isgraph(c) ? "" : "not " ); setlocale(LC_ALL, "en_GB.iso88591"); printf("In ISO-8859-1 locale, \\xb6 is %sgraphical\n", isgraph(c) ? "" : "not " );}
输出:
In the default C locale, \xb6 is not graphical In ISO-8859-1 locale, \xb6 is graphical
C11标准(ISO / IEC 9899:2011):
7.4.1.6 isgraph函数(p:201-202)
C99标准(ISO / IEC 9899:1999):
7.4.1.6 isgraph函数(p:182-183)
C89 / C90标准(ISO / IEC 9899:1990):
4.3.1.5 isgraph函数
iswgraph(C95) | 检查宽字符是否是图形字符(函数) |
---|
| 用于isgraph的C ++文档 |
ASCII 值 (十六进制) | 字符 | 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 | 控制码(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 | 空格 (\n,\v,\f,\r) | ≠0 | 0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
14 - 31 | 0x0E-0x1F | 控制码 | ≠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 | 退格 (DEL) | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |