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📄 example3-16.htm

📁 Visual C++面向对象程序设计教程（配套习题资源）
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>例3-16</title>
</head>

<body>

<blockquote>
  <blockquote>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">#include 
    &lt;iostream.h&gt;</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">class 
    Student</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">public:</font></p>
    <blockquote>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">static 
      char *sName( )</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">cout&lt;&lt;noOfStudents&lt;&lt;endl;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">return 
      name; <font color="#FF0000">//<font FACE="??ì?,SimSun" LANG="ZH-CN">此处有错误，使用了非静态成员</font>name</font></font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">}</font></p>
    </blockquote>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">protected:</font></p>
    <blockquote>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">char 
      name[40];</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">static 
      int noOfStudents;</font></p>
    </blockquote>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">};</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">int 
    Student::noOfStudents=0;</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">void 
    void( )</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
    <blockquote>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">Student 
      s;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">cout&lt;&lt;s.sName( 
      )&lt;&lt;endl;</font></p>
    </blockquote>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">}</font></p>
  </blockquote>
</blockquote>
<font SIZE="3">
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">说明：错误在于静态成员函数</font>sName<font FACE="??ì?,SimSun" LANG="ZH-CN">访问了非静态数据成员</font>name<font FACE="??ì?,SimSun" LANG="ZH-CN">，而</font>name<font FACE="??ì?,SimSun" LANG="ZH-CN">无法确定属于哪个对象。</font></font></p>

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