mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-08 23:14:06 +08:00
36 lines
1.1 KiB
HTML
36 lines
1.1 KiB
HTML
<h1>字符函数 - iscntrl</h1>
|
||
|
||
|
||
<p>原型：extern int iscntrl(int c);</p>
|
||
|
||
<p>用法：#include <ctype.h></p>
|
||
|
||
<p>功能：判断字符c是否为控制字符</p>
|
||
|
||
<p>说明：当c在0x00-0x1F之间或等于0x7F(DEL)时，返回非零值，否则返回零。</p>
|
||
|
||
举例：<pre><code class="language-c">
|
||
|
||
// iscntrl.c
|
||
|
||
#include <syslib.h>
|
||
#include <ctype.h>
|
||
|
||
main()
|
||
{
|
||
int c;
|
||
|
||
clrscr(); // clear screen
|
||
c='a';
|
||
printf("%x:%s\n",c,iscntrl(c)?"yes":"no");
|
||
c=0x0d;
|
||
printf("%x:%s\n",c,iscntrl(c)?"yes":"no");
|
||
c=0x7f;
|
||
printf("%x:%s\n",c,iscntrl(c)?"yes":"no");
|
||
getchar();
|
||
return 0;
|
||
}
|
||
|
||
</code></pre>相关函数：<a href="isalnum.html">isalnum</a>,<a href="isalpha.html">isalpha</a>,<a href="isdigit.html">isdigit</a>,<a href="isxdigit.html">isxdigit</a>,<a href="isgraph.html">isgraph</a>,<a href="isprint.html">isprint</a>,<a href="ispunct.html">ispunct</a>,<a href=isspace.html">isspace</a>
|
||
|