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5.1 运算符
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5.1 运算符
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2006-10-13 14:50:00
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<div style='float:left;width:49%'>·<a href='100165817.htm'>4.2 实现的继承</a></div><div style='float:right;width:49%'>·<a href='100165818.htm'>4.3 修饰符</a></div><div style='float:left;width:49%'>·<a href='100165819.htm'>4.4 接口</a></div><div style='float:right;width:49%'>·<a href='100165821.htm'>5.2 类型的安全性</a></div><div style='float:left;width:49%'>·<a href='100165822.htm'>5.3 对象的相等比较</a></div><div style='float:right;width:49%'>·<a href='100165823.htm'>5.4 运算符重载</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><p class="MsoNormal" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">前几章介绍了使用</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">编写程序所需要的大部分知识。本章将首先讨论基本语言元素，接着论述</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">语言的扩展功能。本章的主要内容如下：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">中的可用运算符</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">处理引用类型和值类型时相等的含义</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">基本数据类型之间的数据转换</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">使用装箱技术把值类型转换为引用类型</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">通过强制转换技术在引用类型之间转换</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">重载标准的运算符，以支持对定制类型的操作</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -16.1pt; LINE-HEIGHT: 15pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">给定制类型添加强制转换运算符，以支持无缝的数据类型转换</span></p>
<h2 style="MARGIN: 11.4pt 0cm"><span lang="EN-US">5.1 </span><span style="FONT-FAMILY: 楷体_GB2312">运算符</span></h2>
<p class="MsoNormal" style="LINE-HEIGHT: 14pt"><span><span lang="EN-US">C</span></span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">C++</span><span style="FONT-FAMILY: 宋体">开发人员应很熟悉大多数</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">运算符，这里为新程序员和</span><span lang="EN-US">VB</span><span style="FONT-FAMILY: 宋体">开发人员介绍最重要的运算符，并介绍</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">中的一些新变化。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 14pt"><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">支持表</span><span lang="EN-US">5-1</span><span style="FONT-FAMILY: 宋体">所示的运算符，其中有</span><span lang="EN-US">4</span><span style="FONT-FAMILY: 宋体">个运算符</span><span lang="EN-US">(sizeof</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">*</span><span style="FONT-FAMILY: 宋体">、–</span><span lang="EN-US">></span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">&)</span><span style="FONT-FAMILY: 宋体">只能用于不安全的代码</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">这些代码绕过了</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">类型安全性的检查</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">，这些不安全的代码见第</span><span lang="EN-US">7</span><span style="FONT-FAMILY: 宋体">章的讨论。</span></p>
<p class="a5" style="MARGIN-TOP: 4.9pt"><span style="FONT-FAMILY: 黑体">表</span><span lang="EN-US"> 5-1</span></p>
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<p class="a2" style="LINE-HEIGHT: 13pt"><span style="FONT-FAMILY: 黑体">类</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">别</span></p>
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<p class="a2" style="LINE-HEIGHT: 13pt"><span style="FONT-FAMILY: 黑体">运</span><span style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">算</span><span style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">符</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13pt"><span style="FONT-FAMILY: 宋体">算术运算符</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13pt"><span lang="EN-US">+ </span><span style="FONT-FAMILY: 宋体">–</span><span lang="EN-US"> * / %</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13pt"><span style="FONT-FAMILY: 宋体">逻辑运算符</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13pt"><span lang="EN-US">& | ^ ~ && || !</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13pt"><span style="FONT-FAMILY: 宋体">字符串连接运算符</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13pt"><span lang="EN-US">+</span></p>
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