第11周报告1

实验目的：学会使用循环控制语句解决实际问题，并强化注重效率的观念
实验内容：用循环控制语句编写程序，完成表达式的计算

* 程序头部注释开始（为避免提交博文中遇到的问题，将用于表明注释的斜杠删除了）
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称：<wbr><wbr><wbr>使用循环控制语句解决实际问题<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br> * 作<wbr><wbr><wbr> 者：雷恒鑫<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br> * 完成日期：<wbr><wbr><wbr><wbr><wbr><wbr>2011<wbr><wbr> 年<wbr><wbr><wbr>11<wbr><wbr><wbr> 月<wbr><wbr><wbr><wbr>01<wbr><wbr><wbr> 日<br> * 版 本号：<wbr><wbr><wbr>68<wbr><wbr><wbr><wbr><wbr><wbr><br><br> * 对任务及求解方法的描述部分<br> * 输入描述：无<br> * 问题描述：求 f=1-1/2!+1/3!-...+1/9!<br> * 程序输出：三种循环语句构造的程序求得的结果<br> * 问题分析：……<br> * 算法设计：为了提高效率，用单重循环完成，不用求幂函数pow()。……<br> * 程序头部的注释结束（此处也删除了斜杠）<br><wbr> //用while循环求解<br><br> #include &lt;iostream&gt;<wbr><wbr><br> using namespace std;<br> int main( )<br> {<br><wbr>int i=0,m,sign=1;<br><wbr>double sum=1,f;<br><wbr>i=i+1;<br><wbr>while (i&lt;=9)<br><wbr>{<br><wbr><wbr>i=i+1,f=1,m=1;<br><wbr><wbr>while (m&lt;=i)<br><wbr><wbr>{<br><wbr><wbr><wbr>f=f*m;<br><wbr><wbr><wbr>m=m+1;<br><wbr><wbr>}<br><wbr><wbr><wbr>sign=-sign;<br><wbr><wbr><wbr>sum=sum+sign/f;<br><wbr>}<br><wbr>cout&lt;&lt;"sum="&lt;&lt;sum&lt;&lt;endl;<br><wbr>return 0;<br> }<br> //用for循环求解<br><br> #include &lt;iostream&gt;<wbr><wbr><br> using namespace std;<br> int main( )<br> {<br><wbr><wbr><wbr> int i=0,m,sign=1;<br><wbr>double sum=1,f;<br><wbr>for (i=i+1;i&lt;=9;sign=-sign,sum=sum+sign/f)<br><wbr>{<br><wbr><wbr>i=i+1,f=1,m=1;<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> while (m&lt;=i)<br><wbr><wbr>{<br><wbr><wbr><wbr>f=f*m;<br><wbr><wbr><wbr>m=m+1;<br><wbr><wbr>}<br><wbr>}<br> cout&lt;&lt;"sum="&lt;&lt;sum&lt;&lt;endl;<br> return 0;<br> }<br><wbr>//用do~while循环求解<br><br> #include &lt;iostream&gt;<wbr><wbr><br> using namespace std;<br> int main( )<br> {<br><wbr>int i=0,m,sign=1;<br><wbr>double sum=1,f;<br><wbr><wbr><wbr> i=i+1;<br><wbr>do<br><wbr>{<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> i=i+1,f=1,m=1;<br><wbr><wbr>while (m&lt;=i)<br><wbr><wbr>{<br><wbr><wbr><wbr>f=f*m;<br><wbr><wbr><wbr>m=m+1;<br><wbr><wbr>}<br><wbr><wbr><wbr>sign=-sign;<br><wbr><wbr><wbr>sum=sum+sign/f;<br><wbr>}<br><wbr>while (i&lt;=12);<br> cout&lt;&lt;"sum="&lt;&lt;sum&lt;&lt;endl;<br> return 0;<br> }<br><br><br> 运行结果：<a href="http://photo.blog.sina.com.cn/showpic.html#blogid=8db23fd10100v52b&amp;url=http://s5.sinaimg.cn/orignal/8db23fd14b0bcf99aebd4" target="_blank"></a><br><br><a href="http://photo.blog.sina.com.cn/showpic.html#blogid=8db23fd10100v52b&amp;url=http://s13.sinaimg.cn/orignal/8db23fd14b0bcfa33981c" target="_blank"><img title="第11周报告1" height="180" alt="第11周报告1" src="http://s13.sinaimg.cn/middle/8db23fd14b0bcfa33981c&amp;690" width="240" name="image_operate_6701320225667609"></a><br><br><br><br> 经验积累：<br> 1.我学会了用Do--While和for循环。<br> 2.<br> 3.<br><br> 上机感言：<br><br><br></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>