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📄 c语言基础(08-有符号数的形式).htm

📁 语言基础(初学都必修)包括数据类型、运算符与表达式,运算符和表达式,逻辑运算符和逻辑表达式,C语言中的关键字,定义宏和使用宏定义,数据类型转换
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      <P align=center>作者：dd&nbsp;&nbsp;&nbsp;&nbsp;教程来源：C语言之家&nbsp;&nbsp;&nbsp;&nbsp;点击数：195&nbsp;&nbsp;&nbsp;&nbsp;更新时间：2006-6-6 <A title=收藏的网页将被永久地保存到新浪ViVi收藏夹http://vivi.sina.com.cn href="javascript:d=document;t=d.selection?(d.selection.type!='None'?d.selection.createRange().text:''):(d.getSelection?d.getSelection():'');void(vivi=window.open('http://vivi.sina.com.cn/collect/icollect.php?pid=2008&title='+escape(d.title)+'&url='+escape(d.location.href)+'&desc='+escape(t),'vivi','scrollbars=no,width=480,height=480,left=75,top=20,status=no,resizable=yes'));vivi.focus();"><IMG src="/images/vivi_coop1.gif" align=absMiddle border=0></A>　</P></td>
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				<p align="left"><P class=MsoNormal><SPAN style="COLOR: blue; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有符号数在内存中的存放形式</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">――不带符号的数，默认为正数，它与带符号的数在内存中的存放形式是完全不一样的。我们知道，</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个字符的长度为</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个字节，也就是</SPAN><SPAN lang=EN-US>8</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">位。为了说清楚</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个字节最多能放多大的数，下面用一个例子来说明这个问题：<BR></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">还是用这个图：</SPAN> 
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<TD>0</TD></TR></TBODY></TABLE><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因为每一个小方框里面是一个二进制的数，假设这是一个计数器，每一位计</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个数向上进一位，应有如下表所示的情形：</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　　　　　　　　　　</SPAN> 
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<P class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN style="COLOR: white; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">十进制数</SPAN><SPAN lang=EN-US style="COLOR: white"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P></TD>
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