example3-7.htm

来自「Visual C++面向对象程序设计教程（配套习题资源）」· HTM 代码 · 共 103 行

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<html>

<head>
<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3-7</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">Student( 
      )</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{ 
      cout&lt;&lt;&quot;constructing student.\n&quot;;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">semesHours=100;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">gpa=80;</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">int 
      semesHours;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">float 
      gpa;</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">class 
    Teacher</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">Teacher( 
      )</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{ 
      cout&lt;&lt;&quot;constructing teacher.\n&quot;; }</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">class 
    TutorPair</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">TutorPair( 
      )</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{ 
      cout&lt;&lt;&quot;constructing tutorpair.\n&quot;; }</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">Student 
      student;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">Teacher 
      teacher;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">int 
      noMeeting;</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">void 
    main( )</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">TutorPair 
      tp;</font></p>
      <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">cout&lt;&lt;&quot;back 
      in main.\n&quot;;</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 FACE="??ì?,SimSun" LANG="ZH-CN" size="2">程序输出结果是：</font></p>
<blockquote>
  <blockquote>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">constructing 
    student</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">constructing 
    teacher</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">constructing 
    tutorpair</font></p>
    <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">back 
    in main</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：主程序运行开始，遇到创建</font>TutorPair<font FACE="??ì?,SimSun" LANG="ZH-CN">类的对象，于是调用其构造函数</font>TutorPair( 
)<font FACE="??ì?,SimSun" LANG="ZH-CN">，该构造函数启动时，首先分配对象空间（一个</font>student<font FACE="??ì?,SimSun" LANG="ZH-CN">对象，一个</font>Teacher<font FACE="??ì?,SimSun" LANG="ZH-CN">对象和一个</font>int<font FACE="??ì?,SimSun" LANG="ZH-CN">型数据），于是，</font>student 
<font FACE="??ì?,SimSun" LANG="ZH-CN">对象的构造函数先执行，然后是</font>teacher<font FACE="??ì?,SimSun" LANG="ZH-CN">对象的构造函数执行，最后返回到</font>TutorPair<font FACE="??ì?,SimSun" LANG="ZH-CN">的构造函数继续执行。当执行完</font>ToturPair( 
)<font FACE="??ì?,SimSun" LANG="ZH-CN">构造函数后，返回到主程序中。</font></font></p>

</body>

</html>

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