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7.3.1 指针(3)
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C#高级编程（第3版）【全文连载】
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7.3.1 指针(3)
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165347.htm'>7.3 不安全的代码</a></div><div style='float:right;width:49%'>·<a href='100165348.htm'>7.3.1 指针(1)</a></div><div style='float:left;width:49%'>·<a href='100165349.htm'>7.3.1 指针(2)</a></div><div style='float:right;width:49%'>·<a href='100165351.htm'>7.3.2 使用指针优化性能</a></div><div style='float:left;width:49%'>·<a href='100165352.htm'>7.4 小结</a></div><div style='float:right;width:49%'>·<a href='100165353.htm'>8.1 System.String类</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h4 style="FTEL: 21.45pt"><span lang="EN-US">10. </span><span style="FONT-FAMILY: 黑体">指针示例</span><span lang="EN-US">PointerPlayaround </span></h4>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面给出一个使用指针的示例：</span><span lang="EN-US">PointerPlayaround</span><span style="FONT-FAMILY: 宋体">。它执行一些简单的指针操作，显示结果，还允许查看内存中发生的情况，并确定变量存储在什么地方：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">using System;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">namespace Wrox.ProCSharp.Chapter07</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> class MainEntryPoint</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> static unsafe void Main()</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> int x=10;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> short y =</span><span style="FONT-FAMILY: 宋体">–</span><span lang="EN-US">1;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> byte y2 = 4;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> double z = 1.5;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> int* pX = &x;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> short* pY = &y;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> double* pZ = &z;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> "Address of x is 0x{0:X}, size is {1}, value is {2}", </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> (uint)&x, sizeof(int), x);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> "Address of y is 0x{0:X}, size is {1}, value is {2}", </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> (uint)&y, sizeof(short), y);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> "Address of y2 is 0x{0:X}, size is {1}, value is {2}", </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> (uint)&y2, sizeof(byte), y2);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> "Address of z is 0x{0:X}, size is {1}, value is {2}", </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> (uint)&z, sizeof(double), z);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> "Address of pX=&x is 0x{0:X}, size is {1}, value is 0x{2:X}", </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> (uint)&pX, sizeof(int*), (uint)pX);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> "Address of pY=&y is 0x{0:X}, size is {1}, value is 0x{2:X}", </span></p>
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