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<h1>字符函数 - isblank</h1>
<p>原型：extern int isblank(int c);</p>
<p>用法：#include &lt;ctype.h></p>
<p>功能：判断字符c是否为TAB或空格</p>
<p>说明：当c为TAB或空格时，返回非零值，否则返回零。</p>
举例：<pre><code class="language-c">
// isalnum.c
#include &lt;syslib.h>
#include &lt;ctype.h>
main()
{
int c;
clrscr(); // clear screen
c='a';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
c='7';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
c='@';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
}
</code></pre>相关函数：<a href="isalpha.html">isalnum</a>,<a href="isalpha.html">isalpha</a>,<a href="iscntrl.html">iscntrl</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>
<h1>字符函数 - isblank</h1>
<p>原型：extern int isblank(int c);</p>
<p>用法：#include &lt;ctype.h></p>
<p>功能：判断字符c是否为TAB或空格</p>
<p>说明：当c为TAB或空格时，返回非零值，否则返回零。</p>
举例：<pre><code class="language-c">
// isalnum.c
#include &lt;syslib.h>
#include &lt;ctype.h>
main()
{
int c;
clrscr(); // clear screen
c='a';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
c='7';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
c='@';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
}
</code></pre>相关函数：<a href="isalpha.html">isalnum</a>,<a href="isalpha.html">isalpha</a>,<a href="iscntrl.html">iscntrl</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>