isgraph (Strings) – C 中文开发手册 - Break易站
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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。
参数
ch-分类字符
- 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
#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 graphicalIn ISO-8859-1 locale, \xb6 is graphical - 参考
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
扩展内容
iswgraph(C95)检查宽字符是否是图形字符(函数)
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 - 80x00-0x08控制码(NUL, etc.)≠00000000000090x09tab (\t)≠00≠0≠00000000010 - 130x0A-0x0D空格 (\n,\v,\f,\r)≠00≠000000000014 - 310x0E-0x1F控制码≠000000000000320x20space0≠0≠0≠00000000033 - 470x21-0x2F!"#$%&'()*+,-./0≠000≠0≠000000048 - 570x30-0x3901234567890≠000≠00≠0000≠0≠058 - 640x3a-0x40:;<=>?@0≠000≠0≠000000065 - 700x41-0x46ABCDEF0≠000≠00≠0≠0≠000≠071 - 900x47-0x5AGHIJKLMNOPQRSTUVWXYZ0≠000≠00≠0≠0≠000091 - 960x5B-0x60[]^_` | 0 | ≠0 | 0 | 0 | ≠0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 |97 -1020x61-0x66abcdef0≠000≠00≠0≠00≠00≠0103-1220x67-0x7Aghijklmnopqrstuvwxyz0≠000≠00≠0≠00≠000123-1260x7B-0x7E{|}~0≠000≠0≠00000001270x7F退格 (DEL)≠000000000000
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