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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_955</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_954.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_955</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_956.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 955</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">Testing: To test this program, we begin by preparing an input file that contains time card information for, say, five employees. The data should be in random order of employee ID to make sure that the sorting routine works properly. Using this input file, we run the program and supply the following interactive input: the ID numbers of all five employees in the data file (the program should print their punch-in times), a few ID numbers that are not in the data file (the program should print the message that these employees have not checked in yet), and a negative ID number (the program should quit). If the program tells us that one of the five employees in the data file has not checked in yet or prints a punch-in time for one of the employees not in the data file, the fault clearly lies with the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">punchInList</font><font face="Times New Roman, Times, Serif" size="3"> objectthe object responsible for reading the file, sorting, and searching. Using a hand trace, debug output statements, or the system debugger, we should check the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">TimeCardList</font><font face="Times New Roman, Times, Serif" size="3"> member functions in the following order: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ReadAll</font><font face="Times New Roman, Times, Serif" size="3"> (to verify that the file data was read into the list correctly), </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">SelSort</font><font face="Times New Roman, Times, Serif" size="3"> (to confirm that the time card information ends up in ascending order of ID number), then </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">BinSearch</font><font face="Times New Roman, Times, Serif" size="3"> (to ensure that items in the list are indeed found and that items not in the list are reported as not there).</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">One more thing needs to be tested. If the data file contains more than </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">MAX_LENGTH</font><font face="Times New Roman, Times, Serif" size="3"> time cards, the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ReadAll</font><font face="Times New Roman, Times, Serif" size="3"> function should print a warning message and ignore the excess time cards. To test this feature, we obviously don't want to create an input file with over 500 time cards. Instead, we go into </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">tclist.h</font><font face="Times New Roman, Times, Serif" size="3"> and change the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">const</font><font face="Times New Roman, Times, Serif" size="3"> definition of </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">MAX_LENGTH</font><font face="Times New Roman, Times, Serif" size="3"> from 500 to a more manageable value3, for example. We then recompile only </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">tclist.cpp</font><font face="Times New Roman, Times, Serif" size="3"> and relink all four object code files. When we run the program, it should read only the first three time cards from the file, print a warning message, and work with a list of only three time cards. Here is a sample run of the program using 3 as the value of </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">MAX_LENGTH</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">Input File</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">398405聽7聽45聽04<br />290387聽7聽48聽10<br />193847聽7聽53聽20<br />938473聽7聽55聽14<br />837485聽8聽00聽00<br />385473聽8聽05聽45<br />573920聽8聽12聽13<br />483948聽8聽14聽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">Copy of the Screen During the Run</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">Input聽file聽name:聽punchin.dat<br />More聽than聽3聽time聽cards聽in聽input聽file.聽Remainder聽are聽ignored.<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_954.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_955</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_956.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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