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📁 经典c语言教程
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<title>练习题一 </title>
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<blockquote>
  <table border="0" width="550" height="181">
    <tr>
      <td width="50%" height="175">　<p>我们想定义一个位段, 它满足下面的要求:<ol>
        <li>a 有两位</li>
        <li>b 有两位</li>
        <li>c 有两位</li>
        <li>d 有四位</li>
      </ol>
      <p>在右边三个程序中, 哪些是符合这种要求的?</p>
      <form name="form">
        <p><input type="text" name="T1" size="4"><input type="button" value="Enter" name="B1"
        onClick="judge()"></p>
      </form>
      </td>
      <td width="50%" height="175"><table>
        <tr>
          <th width="614" bgcolor="#FF9933">1</th>
        </tr>
        <tr>
          <td ALIGN="center" width="614" bgcolor="#00FFFF"><p align="left">struct bitfields1<br>
          {<br>
          &nbsp;&nbsp;&nbsp;&nbsp; unsigned a,b,c: 2;<br>
          &nbsp;&nbsp;&nbsp;&nbsp; unsigned d : 4;<br>
          }</td>
        </tr>
        <tr>
          <th width="614" bgcolor="#FF9933">2</th>
        </tr>
        <tr>
          <td ALIGN="center" width="614" bgcolor="#00FFFF"><p align="left">struct bitfields2<br>
          {<br>
          &nbsp;&nbsp;&nbsp;&nbsp; unsigned a:2, b:2;<br>
          &nbsp;&nbsp;&nbsp;&nbsp; unsigned c:2, d:4;<br>
          }</td>
        </tr>
        <tr>
          <th width="614" bgcolor="#FF9933">3</th>
        </tr>
        <tr>
          <td ALIGN="center" width="614" bgcolor="#00FFFF"><p align="left">struct bitfields3<br>
          {<br>
          &nbsp;&nbsp; &nbsp; unsigned a,b,c: 6;<br>
          &nbsp;&nbsp;&nbsp;&nbsp; unsigned d: 4;<br>
          }</td>
        </tr>
      </table>
      </td>
    </tr>
  </table>
  <p><br>
  </p>
  <div id="a1div" style="display:'none'"><font color="#FF0000"><p>错误！</font>与此等价的说明是:<br>
  unsigned a;<br>
  unsigned b;<br>
  unsigned c: 2;<br>
  unsigned d: 4;<br>
  <br>
  </p>
  </div><div id="a3div" style="display:'none'"><font color="#FF0000"><p>错误！</font>与此等价的说明是:<br>
  unsigned a;<br>
  unsigned b;<br>
  unsigned c: 6;<br>
  unsigned d: 4;</p>
  </div><div id="a2div" style="display:'none'"><p><font color="#FF0000">正确!</font></p>
  </div>
</blockquote>

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