第13周报告3

第13周报告3：
实验目的：学会使用自定义函数解决实际问题，学会函数的嵌套调用
实验内容：编制一个三角函数表

* 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><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：<wbr><wbr>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><br> * 完成日期：<wbr><wbr>2011<wbr><wbr><wbr><wbr><wbr><wbr> 年<wbr><wbr><wbr><wbr>11<wbr><wbr> 月<wbr><wbr><wbr><wbr><wbr>16<wbr><wbr> 日<br> * 版本号：<wbr><wbr><wbr><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：编制一个三角函数表，要求在main()函数中调用show_sin_table(min_angle, max_angle)，显示角度值为min_angle到max_angle之间的所有角度（间隔为1度）的正弦值。要求不能用数学库函数，将任务2中的mysin函数拷贝到这个程序中，用于计算sin值。例如show_sin_table(0, 90)可以显示出所有0到90度的正弦值。为取得更好的效果，可以考虑像英尺到米的转换一样，以速查表格的形式给出结果。<br> * 程序输出：三角函数表<br> * 问题分析：……<br> * 算法设计：……<br> * 程序头部的注释结束（此处也删除了斜杠）<br> ; <p>#include &lt;iostream&gt;<br> #include &lt;iomanip&gt;<br> using namespace std;<br> const double pi=3.1415926;<br> double show_sin_table();<br> double mysin (double a);<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> //下面加入常变量和自定义函数的声明<br> int main( )<br> {<br><wbr>cout&lt;&lt;"<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> ************************"&lt;&lt;endl;<br><wbr>cout&lt;&lt;"<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> 三角函数表<wbr><wbr><wbr><wbr><wbr><wbr> "&lt;&lt;endl;<br><wbr>cout&lt;&lt;"<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> ************************"&lt;&lt;endl;<br><wbr>cout&lt;&lt;endl;<br><wbr>show_sin_table();<br><wbr>cout&lt;&lt;endl;<br><wbr>cout&lt;&lt;"<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><wbr>return 0;<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></p> <p><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> //下面定义show_sin_table()函数</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></p> <p>double show_sin_table()<br> {<br><wbr>int i,k;<br><wbr>double x,y;<br><wbr>i=0;<br><wbr>cout&lt;&lt;"<wbr><wbr><wbr><wbr><wbr><wbr><wbr> ";<br><wbr>do<br><wbr>{<br><wbr> cout&lt;&lt;setw(6)&lt;&lt;i;<br><wbr> i=i+1;<br><wbr>}while (i&lt;=9);<br><wbr>for (i=0;i&lt;=90;i=i+1)<br><wbr>{<br><wbr> x=i;<br><wbr> if (i==0)<br><wbr> {<br><wbr><wbr> cout&lt;&lt;endl;<br><wbr><wbr> cout&lt;&lt;"<wbr><wbr><wbr><wbr><wbr> ";<br><wbr><wbr> k=i/10;<br><wbr><wbr> cout&lt;&lt;k;<br><wbr><wbr> y=mysin((i/180.0)*pi);<br><wbr><wbr> cout&lt;&lt;setiosflags(ios::fixed)&lt;&lt;setprecision(3);<br><wbr><wbr> cout&lt;&lt;setw(7)&lt;&lt;y;<br><wbr> }<br><wbr> else<br><wbr> {<br><wbr><wbr> y=mysin((i/180.0)*pi);<br><wbr><wbr> cout&lt;&lt;setw(6)&lt;&lt;y;<br><wbr> }<br><wbr>}<br><wbr>cout&lt;&lt;endl;<br><wbr>return 0;<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></p> <p><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> //下面定义mysin函数<br> double mysin (double a)<br> {<br><wbr><wbr><wbr> double b=0,w=1,m=2,n=3,t=0,sum=0,sign=1;<br><wbr>b=a;<br><wbr>t=b/w;<br><wbr>do<br><wbr>{<br><wbr> sum=sum+sign*t;<br><wbr> w=w*m*n;<br><wbr> m=m+2;<br><wbr> n=n+2;<br><wbr> b=b*a*a;<br><wbr> t=b/w;<br><wbr> sign=-sign;<br><wbr><br><wbr>}while (t&gt;=0.00001);<br><wbr>return sum;<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></p> <p><br><br> 运行结果：<a href="http://photo.blog.sina.com.cn/showpic.html#blogid=8db23fd10100vskz&amp;url=http://s15.sinaimg.cn/orignal/8db23fd14b1d82af5f6ce" target="_blank"></a><br><a href="http://photo.blog.sina.com.cn/showpic.html#blogid=8db23fd10100vskz&amp;url=http://s3.sinaimg.cn/orignal/8db23fd14b1fc2ed1a5b2" target="_blank"></a><br><a href="http://photo.blog.sina.com.cn/showpic.html#blogid=8db23fd10100vskz&amp;url=http://s13.sinaimg.cn/orignal/8db23fd14b23dbbae3b0c" target="_blank"><img title="第13周报告3" alt="第13周报告3" src="http://s13.sinaimg.cn/middle/8db23fd14b23dbbae3b0c&amp;690" name="image_operate_56101342182198687"></a><br><br><br><br><br><br> 经验积累：<br> 1.有时把整形定义成浮点型对结果有一定的影响<br> 2.<br> 3.<br><br> 上机感言：<br></p> </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>