📄 example3-17.htm
字号:
<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3-17</title>
</head>
<body>
<blockquote>
<blockquote>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">#include
<iostream.h></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">class
M</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">M(int
a){ A=a;B+=a;}</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">static
void f1(M m);</font></p>
</blockquote>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">private:</font></p>
<blockquote>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">int
A;</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">static
int B;</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
M::f1(M m)</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">cout<<"A="<<m.A<<endl;
//<font FACE="??ì?,SimSun" LANG="ZH-CN">在静态成员函数中，只能通过对象访问类的非静态成员</font></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">cout<<"B="<<B<<endl;
//B<font FACE="??ì?,SimSun" LANG="ZH-CN">是静态成员，可以在静态成员函数中访问</font></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
M::B=0;</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">M
P(5), Q(10);</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">M::f1(P);
//<font FACE="??ì?,SimSun" LANG="ZH-CN">访问静态成员函数，前面可以用类名或对象名，下同。</font></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">M::f1(Q);</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">A=5</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">B=15</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">A=10</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">B=15</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：这里定义了两个对象</font>P<font FACE="??ì?,SimSun" LANG="ZH-CN">和</font>Q<font FACE="??ì?,SimSun" LANG="ZH-CN">，</font>P<font FACE="??ì?,SimSun" LANG="ZH-CN">初始化后，</font>P<font FACE="??ì?,SimSun" LANG="ZH-CN">的数据成员</font>A=5<font FACE="??ì?,SimSun" LANG="ZH-CN">，静态数据成员</font>B=5<font FACE="??ì?,SimSun" LANG="ZH-CN">，</font>Q<font FACE="??ì?,SimSun" LANG="ZH-CN">初始化后，</font>Q<font FACE="??ì?,SimSun" LANG="ZH-CN">的数据成员</font>A=10<font FACE="??ì?,SimSun" LANG="ZH-CN">，静态数据成员</font>B=15<font FACE="??ì?,SimSun" LANG="ZH-CN">。执行语句</font>M::f1(P)<font FACE="??ì?,SimSun" LANG="ZH-CN">时，先输出</font>P<font FACE="??ì?,SimSun" LANG="ZH-CN">的数据成员</font>A<font FACE="??ì?,SimSun" LANG="ZH-CN">，结果为</font>5<font FACE="??ì?,SimSun" LANG="ZH-CN">，再输出静态数据成员</font>B<font FACE="??ì?,SimSun" LANG="ZH-CN">的值，结果为</font>15<font FACE="??ì?,SimSun" LANG="ZH-CN">。执行语句</font>M::f1(Q)<font FACE="??ì?,SimSun" LANG="ZH-CN">时，先输出</font>Q<font FACE="??ì?,SimSun" LANG="ZH-CN">的数据成员</font>A<font FACE="??ì?,SimSun" LANG="ZH-CN">，结果为</font>10<font FACE="??ì?,SimSun" LANG="ZH-CN">，再输出静态数据成员</font>B<font FACE="??ì?,SimSun" LANG="ZH-CN">的值，结果为</font>15<font FACE="??ì?,SimSun" LANG="ZH-CN">。</font></font></p>
</body>
</html>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -