isprint
来自cppreference.com
在标头 <ctype.h> 定义
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int isprint( int ch ); |
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检查给定的字符能否被打印,即为数字(0123456789
)、大写字母(ABCDEFGHIJKLMNOPQRSTUVWXYZ
)、小写字母(abcdefghijklmnopqrstuvwxyz
)、标点字符(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
)或空格之一,或任何当前 C 本地环境分类为可打印的字符。
若 ch
的值不能表示为 unsigned char 且不等于 EOF,则行为未定义。
参数
ch | - | 要分类的字符 |
返回值
若字符能被打印则为非零,否则为零。
示例
运行此代码
#include <stdio.h> #include <ctype.h> #include <locale.h> int main(void) { unsigned char c = '\xa0'; // ISO-8859-1 的无中断空格 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
引用
- C17 标准(ISO/IEC 9899:2018):
- 7.4.1.8 The isprint function (第 146 页)
- C11 标准(ISO/IEC 9899:2011):
- 7.4.1.8 The isprint function (第 202 页)
- C99 标准(ISO/IEC 9899:1999):
- 7.4.1.8 The isprint function (第 183 页)
- C89/C90 标准(ISO/IEC 9899:1990):
- 4.3.1.7 The isprint function
参阅
(C95) |
检查宽字符是否为打印字符 (函数) |
ASCII 值 | 字符 |
isprint |
|||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
十进制 | 十六进制 | 八进制 | |||||||||||||
0–8 | \x0 –\x8
|
\0 –\10
|
控制码 (NUL 等)
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
9 | \x9
|
\11
|
制表符 (\t )
|
≠0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
10–13 | \xA –\xD
|
\12 –\15
|
空白符 (\n , \v , \f , \r )
|
≠0
|
0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
14–31 | \xE –\x1F
|
\16 –\37
|
控制码 | ≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
32 | \x20
|
\40
|
空格 | 0
|
≠0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
33–47 | \x21 –\x2F
|
\41 –\57
|
!"#$%&'()*+,-./
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
48–57 | \x30 –\x39
|
\60 –\71
|
0123456789
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
0
|
0
|
0
|
≠0
|
≠0
|
58–64 | \x3A –\x40
|
\72 –\100
|
:;<=>?@
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
65–70 | \x41 –\x46
|
\101 –\106
|
ABCDEF
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
≠0
|
0
|
0
|
≠0
|
71–90 | \x47 –\x5A
|
\107 –\132
|
GHIJKLMNOP QRSTUVWXYZ
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
≠0
|
0
|
0
|
0
|
91–96 | \x5B –\x60
|
\133 –\140
|
[\]^_`
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
97–102 | \x61 –\x66
|
\141 –\146
|
abcdef
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
0
|
≠0
|
0
|
≠0
|
103–122 | \x67 –\x7A
|
\147 –\172
|
ghijklmnop qrstuvwxyz
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
0
|
≠0
|
0
|
0
|
123–126 | \x7B –\x7E
|
\172 –\176
|
{|}~
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
127 | \x7F
|
\177
|
退格符 (DEL )
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|