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src/docs/c/isblank.html

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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>
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