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</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>#include &lt;ctype.h&gt;</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>int isalpha( int ch );</span></pre>
        </td>
      </tr>
    </tbody>
  </table>
  <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是字母字符，函数返回非零值，否则返回零值。</p>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span>char c;</span></pre>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span>scanf( &quot;%c&quot;, &amp;c );</span></pre>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span>if( isalpha(c) )</span></pre>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>printf( &quot;You entered a letter of the alphabet\n&quot; );</span></pre>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
  <strong><a href="#isalnum">isalnum()</a>, <a href="#iscntrl">iscntrl()</a>, <a href="#isdigit">isdigit()</a>, 
  <a href="#isgraph">isgraph()</a>, <a href="#isprint">isprint()</a>, <a href="#ispunct">ispunct()</a>, 
  and <a href="#isspace">isspace()</a>.</strong></span></p>
  <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
    <span lang="EN-US">
    <hr align="center" width="100%" SIZE="2">
    </span>
  </div>
  <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
	<a name="iscntrl">iscntrl</a></span></h2>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
  <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0">
    <tbody>
      <tr>
        <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt">
          <pre><span lang="EN-US">&nbsp;<o:p>
</o:p>
</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>#include &lt;ctype.h&gt;</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>int iscntrl( int ch );</span></pre>
        </td>
      </tr>
    </tbody>
  </table>
  <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是控制字符（<span lang="EN-US">0和0x1F之间的字符，或者等于0x7F）函数返回非零值，否则返回零值。<span style="mso-spacerun: yes">&nbsp;</span></span></p>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
  <strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#isdigit">isdigit()</a>, 
  <a href="#isgraph">isgraph()</a>, <a href="#isprint">isprint()</a>, <a href="#ispunct">ispunct()</a>, 
  and <a href="#isspace">isspace()</a>.</strong></span></p>
  <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
    <span lang="EN-US">
    <hr align="center" width="100%" SIZE="2">
    </span>
  </div>
  <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
	<a name="isdigit">isdigit</a></span></h2>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
  <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0">
    <tbody>
      <tr>
        <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt">
          <pre><span lang="EN-US">&nbsp;<o:p>
</o:p>
</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>#include &lt;ctype.h&gt;</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>int isdigit( int ch );</span></pre>
        </td>
      </tr>
    </tbody>
  </table>
  <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是<span lang="EN-US">0到9之间的数字字符，函数返回非零值，否则返回零值.</span></p>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span>char c;</span></pre>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span>scanf( &quot;%c&quot;, &amp;c );</span></pre>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span>if( isdigit(c) )</span></pre>
  <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>printf( &quot;You entered the digit %c\n&quot;, c );</span></pre>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
  <strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#iscntrl">iscntrl()</a>, 
  <a href="#isgraph">isgraph()</a>, <a href="#isprint">isprint()</a>, <a href="#ispunct">ispunct()</a>, 
  and <a href="#isspace">isspace()</a>.</strong></span></p>
  <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
    <span lang="EN-US">
    <hr align="center" width="100%" SIZE="2">
    </span>
  </div>
  <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
	<a name="isgraph">isgraph</a></span></h2>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
  <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0">
    <tbody>
      <tr>
        <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt">
          <pre><span lang="EN-US">&nbsp;<o:p>
</o:p>
</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>#include &lt;ctype.h&gt;</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>int isgraph( int ch );</span></pre>
        </td>
      </tr>
    </tbody>
  </table>
  <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是除空格外的可打印字符（可见的字符），函数返回非零值，否则返回零值。</p>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
  <strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#iscntrl">iscntrl()</a>, 
  <a href="#isdigit">isdigit()</a>, <a href="#isprint">isprint()</a>, <a href="#ispunct">ispunct()</a>, 
  and <a href="#isspace">isspace()</a>.</strong></span></p>
  <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
    <span lang="EN-US">
    <hr align="center" width="100%" SIZE="2">
    </span>
  </div>
  <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
	<a name="islower">islower</a></span></h2>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
  <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0">
    <tbody>
      <tr>
        <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt">
          <pre><span lang="EN-US">&nbsp;<o:p>
</o:p>
</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>#include &lt;ctype.h&gt;</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>int islower( int ch );</span></pre>
        </td>
      </tr>
    </tbody>
  </table>
  <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是小写字母字符，函数返回非零值，否则返回零值。</p>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
  <strong><a href="#isupper">isupper()</a></strong></span></p>
  <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
    <span lang="EN-US">
    <hr align="center" width="100%" SIZE="2">
    </span>
  </div>
  <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">
	<a name="isprint">isprint</a></span></h2>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p>
  <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0">
    <tbody>
      <tr>
        <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt">
          <pre><span lang="EN-US">&nbsp;<o:p>
</o:p>
</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>#include &lt;ctype.h&gt;</span></pre>
          <pre><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp; </span>int isprint( int ch );</span></pre>
        </td>
      </tr>
    </tbody>
  </table>
  <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：如果参数是可打印字符（包括空格），函数返回非零值，否则返回零值。</p>
  <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br>
  <strong><a href="#isalnum">isalnum()</a>, <a href="#isalpha">isalpha()</a>, <a href="#iscntrl">iscntrl()</a>, 
  <a href="#isdigit">isdigit()</a>, <a href="#isgraph">isgraph()</a>, <a href="#ispunct">ispunct()</a>, 
  and <a href="#isspace">isspace()</a>.</strong></span></p>
  <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center">
    <span lang="EN-US">
    <hr align="center" width="100%" SIZE="2">
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