isprint
isprint
在头文件 | | |
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int isprint(int ch); | | |
检查给定字符是否可以打印,即它是数字(0123456789),大写字母(ABCDEFGHIJKLMNOPQRSTUVWXYZ),小写字母(abcdefghijklmnopqrstuvwxyz),标点符号(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~)还是空格,或者是当前C语言环境中可打印的任何字符。
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。
参数
ch | - | 字符分类 |
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返回值
如果可以打印字符,则为非零值,否则为零。
例
#include <stdio.h>
#include <ctype.h>
#include <locale.h>
int main(void)
{
unsigned char c = '\xa0'; // the non-breaking space in ISO-8859-1
printf("In the default C locale, \\xa0 is %sprintable\n", isprint(c)?"":"not "
setlocale(LC_ALL, "en_GB.iso88591"
printf("In ISO-8859-1 locale, \\xa0 is %sprintable\n", isprint(c)?"":"not "
}
输出:
In the default C locale, \xa0 is not printable
In ISO-8859-1 locale, \xa0 is printable
参考
- C11标准(ISO / IEC 9899:2011):
扩展内容
iswprint(C95) | 检查宽字符是否为打印字符(功能) |
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| isprint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. |
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0 - 8 | 0x00-0x08 | 控制码 (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 | 空格 (\n,\v,\f,\r) | ≠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 |
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 | 退格 (DEL) | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |