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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_360</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_359.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_360</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_361.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 360</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="Times New Roman, Times, Serif" size="3"><i>(text box continued from previous page)</i></font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table cellspacing="0" border="0" width="614" cellpadding="4"><tr><td valign="top"><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">One advantage of physical hiding is that it helps the programmer avoid the temptation to take advantage of any unusual features of a function's implementation. For example, suppose we were changing the Activity program to read temperatures and output activities repeatedly. Knowing that function </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">GetTemp</font><font face="Times New Roman, Times, Serif" size="3"> doesn't perform range checking on the input value, we might be tempted to use-1000 as a sentinel for the loop:</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr><tr><td valign="top"><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">int聽main()<br />{<br />聽聽聽聽int聽temperature;<br /><br />聽聽聽聽GetTemp(temperature);<br />聽聽聽聽while聽(temperature聽!=聽-1000)<br />聽聽聽聽{<br />聽聽聽聽聽聽聽聽PrintActivity(temperature);<br />聽聽聽聽聽聽聽聽GetTemp(temperature);<br />聽聽聽聽}<br />聽聽聽聽return聽0;<br />}</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr><tr><td valign="top"><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">This code works fine for now, but later we might want to improve </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">GetTemp</font><font face="Times New Roman, Times, Serif" size="3"> so that it checks for a valid temperature range (as it should).</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr><tr><td valign="top"><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">void聽GetTemp(聽/*聽out聽*/聽int&聽temp聽)<br /><br />//聽This聽function聽prompts聽for聽a聽temperature聽to聽be聽entered,聽reads<br />//聽the聽input聽value,聽checks聽to聽be聽sure聽it聽is聽in聽a聽valid聽temperature<br />//聽range,聽and聽echo-prints聽it<br />//聽Postcondition:<br /><br />//聽聽聽聽聽User聽has聽been聽prompted聽for聽a聽temperature聽value聽(temp)<br />//聽聽&&聽Error聽messages聽and聽additional聽prompts聽have聽been聽printed<br />//聽聽聽聽聽聽in聽response聽to聽invalid聽data<br />//聽聽&&聽IF聽no聽valid聽data聽was聽encountered聽before聽EOF<br />//聽聽聽聽聽聽聽聽聽Value聽of聽temp聽is聽undefined<br />//聽聽聽聽聽ELSE<br />//聽聽聽聽聽聽聽聽聽-50聽</font><font face="Symbol" size="2"></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">聽temp聽</font><font face="Symbol" size="2"></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">聽130聽聽&&聽聽temp聽has聽been聽printed<br /><br />{<br />聽聽聽聽cout聽<聽Enter聽the聽outside聽temperature聽(-50聽through聽130):聽;<br />聽聽聽聽cin聽>>聽temp;</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr></table><br /><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"><i>(text box continued on next page)</i></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_359.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_360</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_361.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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