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<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><meta http-equiv="Content-Language" content="zh-cn"><meta name="GENERATOR" content="Microsoft FrontPage 4.0"><meta name="ProgId" content="FrontPage.Editor.Document"><title>这里是主标题</title><meta http-equiv="Page-Enter" content="revealTrans(Duration=1.0,Transition=23)"><meta http-equiv="Page-Exit" content="revealTrans(Duration=1.0,Transition=23)"><meta name="Microsoft Theme" content="expeditn 001, default"></head><body background="../../_themes/expeditn/exptextb.jpg" bgcolor="#FFFFFF" text="#000000" link="#993300" vlink="#666600" alink="#CC3300"><div align="center"> <center> <table border="0" width="80%"> <tr> <td align="center" colspan="2"><font size="6" color="#800000">1.2 机器语言、汇编语言及软件的分类<span style="position: absolute; left: 113; top: 75"><a href="index.htm"><img border="0" src="images/back.gif" alt="回到本章首页" width="60" height="45"></a></span><span style="position: absolute; left: 704; top: 76"><a href="new_page_1.htm"><img border="0" src="images/prev.gif" alt="第一章第一节" width="60" height="45"></a></span><span style="position: absolute; left: 828; top: 78; z-index: 1"><a href="new_page_3.htm"><img border="0" src="images/forw.gif" alt="第一章第三节" width="60" height="45"></a></span></font></td> </tr> <tr> <td colspan="2"></td> </tr> <tr> <td colspan="2"> <p> </p> <p><img border="0" src="images/sub.gif" width="26" height="27"><font size="5" color="#800000">电子计算机只认识用电信号开和关表示的“1”和“0”</font></p> </td> </tr> <tr> <td width="5%"></td> <td width="60%"> <ol style="color: #800000"> <li>0和1是计算机的工作基础 </li> <li>例: 000110010100000 表示 A+B就显得枯燥无味，而且只有专家能使用计算计</li> </ol> </td> </tr> <tr> <td colspan="2"><img border="0" src="images/sub.gif" width="26" height="27"><font size="5" color="#800000">计算机科学家研制符号汇编语言</font></td> </tr> <tr> <td width="5%"></td> <td width="60%"> <ol style="color: #800000"> <li><font size="3" color="#800000">由汇编编译器（assembler)将符号语言翻译成二进制语言</font></li> <li><font size="3" color="#800000">同外部设备直接打交道则用汇编效率高</font></li> </ol> </td> </tr> <tr> <td colspan="2"><img border="0" src="images/sub.gif" width="26" height="27"><font size="5" color="#800000">高级语言(high_level programming language)</font></td> </tr> <tr> <td width="5%"></td> <td width="60%"> <ol style="color: #800000"> <li>由编译器（compilers)将高级语言翻译成汇编语言</li> <li>高级语言有好多优点 <!--msthemelist--><table border="0" cellpadding="0" cellspacing="0" width="100%"> <!--msthemelist--><tr><td valign="baseline" width="42"><img src="../../_themes/expeditn/expbul2d.gif" width="12" height="12" hspace="15"></td><td valign="top" width="100%"><font color="#800000">便于编写、阅读，接近自然语言</font><!--msthemelist--></td></tr> <!--msthemelist--><tr><td valign="baseline" width="42"><img src="../../_themes/expeditn/expbul2d.gif" width="12" height="12" hspace="15"></td><td valign="top" width="100%"><font color="#800000">提高软件产量</font><!--msthemelist--></td></tr> <!--msthemelist--><tr><td valign="baseline" width="42"><img src="../../_themes/expeditn/expbul2d.gif" width="12" height="12" hspace="15"></td><td valign="top" width="100%"><font color="#800000">便于移植，独立于硬件环境</font><!--msthemelist--></td></tr> <!--msthemelist--></table> </li> </ol> </td> </tr> <tr> <td colspan="2"><img border="0" src="images/sub.gif" width="26" height="27"><font size="5" color="#800000">专用程序库</font></td> </tr> <tr> <td width="5%"></td> <td width="60%"><font size="3" color="#800000">基本I/O管理程序库是操作系统的基础</font></td> </tr> </table> </center></div><p><font size="3" color="#800000"> <img border="0" src="images/sub.gif" width="26" height="27"></font><font size="5" color="#800000">按应用，软件分两类 </font><font size="3" color="#800000"> </font></p><div align="center"> <center> <table border="2" cellpadding="8" cellspacing="5" width="707" bordercolordark="#660000" bordercolorlight="#CC9966"> <tr> <td width="195"><font size="4" color="#800000"> 系统软件</font></td> <td width="454"><font size="4" color="#800000"> 如： 操作系统、 编译器</font></td> </tr> <tr> <td width="195"><font size="4" color="#800000"> 应用软件</font></td> <td width="454"><font size="4" color="#800000"> 如： spreadsheet,文字编辑器</font></td> </tr> </table> </center></div><p> </p></body></html>⌨️ 快捷键说明
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