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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_650</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_649.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_650</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_651.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 650</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">3. The item being searched for</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">4. A flag telling whether or not the search was successful</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">5. The index indicating where the item was located (if found)</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 array containing the list is made up of components of type </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ItemType</font><font face="Times New Roman, Times, Serif" size="3">.</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">We call the array </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">list</font><font face="Times New Roman, Times, Serif" size="3"> and the item being searched for </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">item</font><font face="Times New Roman, Times, Serif" size="3">. The variables </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">length</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">found</font><font face="Times New Roman, Times, Serif" size="3">, and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">index</font><font face="Times New Roman, Times, Serif" size="3"> serve the same purposes here as they did in the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ScanList</font><font face="Times New Roman, Times, Serif" size="3"> function; that is, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">length</font><font face="Times New Roman, Times, Serif" size="3"> is the number of filled components in the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">list</font><font face="Times New Roman, Times, Serif" size="3"> array, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">found</font><font face="Times New Roman, Times, Serif" size="3"> tells whether the item is in </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">list</font><font face="Times New Roman, Times, Serif" size="3">, and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">index</font><font face="Times New Roman, Times, Serif" size="3"> gives the location of </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">item</font><font face="Times New Roman, Times, Serif" size="3"> if it is present in </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">list</font><font face="Times New Roman, Times, Serif" size="3">.</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">Note that the two outgoing parameters, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">index</font><font face="Times New Roman, Times, Serif" size="3"> and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">found</font><font face="Times New Roman, Times, Serif" size="3">, are redundant. The </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">index</font><font face="Times New Roman, Times, Serif" size="3"> parameter would be sufficient because the calling routine could check to see if </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">index</font><font face="Times New Roman, Times, Serif" size="3"> is greater than </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">length-1</font><font face="Times New Roman, Times, Serif" size="3">. If it is, then </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">item</font><font face="Times New Roman, Times, Serif" size="3"> was not found. We keep this redundancy, however, for clarity.</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">#include聽"bool.h"聽聽聽//聽For聽Boolean聽type<br />聽聽.<br />聽聽.<br />聽聽.<br />void聽Search(<br />聽聽聽聽聽/*聽in聽*/聽const聽ItemType聽list[],聽聽聽聽//聽List聽to聽be聽searched<br />聽聽聽聽聽/*聽in聽*/聽聽聽聽聽聽聽ItemType聽item,聽聽聽聽聽聽//聽Item聽to聽be聽found<br />聽聽聽聽聽/*聽in聽*/聽聽聽聽聽聽聽int聽聽聽聽聽聽length,聽聽聽聽//聽Length聽of聽list<br />聽聽聽聽聽/*聽out聽*/聽聽聽聽聽聽int&聽聽聽聽聽index,聽聽聽聽聽//聽Location聽of聽item聽if聽found<br />聽聽聽聽聽/*聽out聽*/聽聽聽聽聽聽Boolean&聽found聽)聽聽聽聽//聽True聽if聽item聽is聽found<br /><br />//聽Searches聽list聽for聽item,聽returning聽the聽index<br />//聽of聽item聽if聽item聽was聽found<br /><br />//聽Precondition:<br />//聽聽聽聽聽length聽<=聽MAX_LENGTH<br />//聽聽&&聽list[0..length-1]聽are聽assigned聽&&聽item聽is聽assigned<br />//聽Postcondition:<br />//聽聽聽聽聽IF聽item聽is聽in聽list<br />//聽聽聽聽聽聽聽聽聽found聽==聽TRUE聽&&聽list[index]聽==聽item<br />//聽聽聽聽聽ELSE<br />//聽聽聽聽聽聽聽聽聽found聽==聽FALSE聽&&聽index聽==聽length<br /><br />{<br />聽聽聽聽index聽=聽0;<br />聽聽聽聽while聽(index聽<聽length聽&&聽item聽!=聽list[index])<br /><br />聽聽聽聽聽聽聽聽聽聽聽聽//聽Invariant聽(prior聽to聽test):<br />聽聽聽聽聽聽聽聽聽聽聽聽//聽聽聽聽聽item聽is聽not聽in聽list[0..index-1]<br />聽聽聽聽聽聽聽聽聽聽聽聽//聽聽&&聽0聽<=聽index聽<=聽length<br /><br />聽聽聽聽聽聽聽聽index++;<br /><br />聽聽聽聽found聽=聽(index聽<聽length);<br />}</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_649.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_650</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_651.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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