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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>page_172</title> <link rel="stylesheet" href="reset.css" type="text/css" media="all"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body> <table summary="top nav" border="0" width="100%"> <tr> <td align="left" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_171.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_172</strong></td> <td align="right" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_173.html">next page ></a></td> </tr> <tr> <td align="left" colspan="3" style="background: #ffffff; padding: 20px;"> <table border="0" width="100%" cellpadding="0"><tr><td align="center"> <table border="0" cellpadding="2" cellspacing="0" width="100%"><tr><td align="left"></td> <td align="right"></td> </tr></table></td></tr><tr><td align="left"><p></p><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="right"><font face="Times New Roman, Times, Serif" size="2" color="#FF0000">Page 172</font></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">聽聽聽聽cout.setf(ios::fixed,聽ios::floatfield);聽聽聽//聽Set聽up聽floating聽pt.<br />聽聽聽聽cout.setf(ios::showpoint);聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽聽聽output聽format<br /><br />聽聽聽聽//聽Prepare聽file聽for聽reading<br /><br />聽聽聽聽scoreFile.open(scores.dat);<br /><br />聽聽聽聽//聽Get聽data<br /><br />聽聽聽聽scoreFile聽>>聽test1聽>>聽weight1;<br />聽聽聽聽scoreFile聽>>聽test2聽>>聽weight2;<br />聽聽聽聽scoreFile聽>>聽test3聽>>聽weight3;<br /><br />聽聽聽聽//聽Print聽heading<br /><br />聽聽聽聽cout聽<<聽Test聽Score聽聽Weight聽<<聽endl聽<<聽endl;<br /><br />聽聽聽聽//聽Print聽data<br /><br />聽聽聽聽cout聽<<聽setw(7)聽<<聽test1<br />聽聽聽聽聽聽聽聽聽<<聽setw(11)聽<<聽setprecision(2)聽<<聽weight1聽<<聽endl;<br />聽聽聽聽cout聽<<聽setw(7)聽<<聽test2聽<<聽setw(11)聽<<聽weight2聽<<聽endl;<br />聽聽聽聽cout聽<<聽setw(7)聽<<聽test3聽<<聽setw(11)聽<<聽weight3聽<<聽endl;<br /><br />聽聽聽聽//聽Find聽weighted聽average<br /><br />聽聽聽聽ave聽=聽test1聽*聽weight1聽+聽test2聽*聽weight2聽+聽test3聽*聽weight3;<br /><br />聽聽聽聽//聽Print聽weighted聽average<br /><br />聽聽聽聽cout聽<<聽endl;<br />聽聽聽聽cout聽<<聽Weighted聽average聽=聽聽<<聽ave聽<<聽endl;<br />聽聽聽聽return聽0;<br /><br />}</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">If the file </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">scoreFile</font><font face="Times New Roman, Times, Serif" size="3"> (that is, the physical disk file </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">scores.dat</font><font face="Times New Roman, Times, Serif" size="3">) contains this data:</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">90聽聽聽0.30<br />85聽聽聽0.25<br />78聽聽聽0.45</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">the output from the program looks like this:</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr></table><p><font size="0"></font></p>聽 </td> </tr> <tr> <td align="left" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_171.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_172</strong></td> <td align="right" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_173.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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