subject_61359.htm

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序号：61359 发表者：蔡以雷 发表日期：2003-11-19 13:12:46
<br>主题：菜鸟请教？
<br>内容：#include &lt;stdio.h&gt;<BR><BR>void main(void)<BR> {<BR>&nbsp;&nbsp; unsigned u_val = 1;<BR>&nbsp;&nbsp; signed int value = -1;<BR><BR>&nbsp;&nbsp; printf(&#34;%u (unsigned) shifted left 2 times is %u\n&#34;, <BR>&nbsp;&nbsp;&nbsp;&nbsp; u_val, u_val &lt;&lt; 2);<BR><BR>&nbsp;&nbsp; printf(&#34;%u (unsigned) shifted right 2 times is %u\n&#34;, <BR>&nbsp;&nbsp;&nbsp;&nbsp; u_val, u_val &gt;&gt; 2);<BR><BR>&nbsp;&nbsp; u_val = 65535;<BR><BR>&nbsp;&nbsp; printf(&#34;%u (unsigned) shifted left 2 times is %u\n&#34;, <BR>&nbsp;&nbsp;&nbsp;&nbsp; u_val, u_val &lt;&lt; 2);<BR><BR>&nbsp;&nbsp; printf(&#34;%u (unsigned) shifted right 2 times is %u\n&#34;, <BR>&nbsp;&nbsp;&nbsp;&nbsp; u_val, u_val &gt;&gt; 2);<BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp; printf(&#34;%d (signed) shifted left 2 times is %d\n&#34;, <BR>&nbsp;&nbsp;&nbsp;&nbsp; value, value &lt;&lt; 2);<BR><BR>&nbsp;&nbsp; printf(&#34;%d (signed) shifted right 2 times is %d\n&#34;, <BR>&nbsp;&nbsp;&nbsp;&nbsp; value, value &gt;&gt; 2);<BR> }<BR>这段原码里的(&gt;&gt; and &lt;&lt;)分别表示什么意思啊？？
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回复者：樂日華 回复日期：2003-11-19 13:16:25
<br>内容：做乘發運算&nbsp;&nbsp;做除法運算啊
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<font color=red>答案被接受</font><br>回复者：视频新手 回复日期：2003-11-19 13:17:45
<br>内容：value&lt;&lt;2 表示左移两位, 相当与value *= 4;<BR>&gt;&gt;表示右移
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回复者：视频新手 回复日期：2003-11-19 13:18:44
<br>内容：&lt;BLOCKQUOTE&gt;引用“第2楼”所言<BR>&lt;Q&gt;value&lt;&lt;2 表示左移两位, 相当与value *= 4;&nbsp;&nbsp;&gt;&gt;表示右移&lt;/Q&gt;&lt;/BLOCKQUOTE&gt;<BR><BR>value&lt;&lt;2 表示左移两位, 相当与value * 4<BR>
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