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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_892</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_891.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_892</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_893.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 892</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">#include聽<iostream.h><br />#include聽timetype.h<br /><br />int聽main()<br />{<br />聽聽聽聽TimeType聽time;<br />聽聽聽聽int聽聽聽聽聽聽hours;<br />聽聽聽聽int聽聽聽聽聽聽minutes;<br />聽聽聽聽int聽聽聽聽聽聽seconds;<br /><br />聽聽聽聽cout聽<<聽Enter聽a聽time聽(use聽hours聽<聽0聽to聽quit):聽;<br />聽聽聽聽cin聽>>聽hours聽>>聽minutes聽>>聽seconds;<br />聽聽聽聽while聽(hours聽>=聽0)<br />聽聽聽聽{<br />聽聽聽聽聽聽聽聽time.Set(hours,聽minutes,聽seconds);<br />聽聽聽聽聽聽聽聽time.Increment();<br />聽聽聽聽聽聽聽聽cout聽<<聽Incremented聽time聽is聽;<br />聽聽聽聽聽聽聽聽time.聽Write聽();<br />聽聽聽聽聽聽聽聽cout聽<<聽endl;<br />聽聽聽聽聽聽聽聽cout聽<<聽Enter聽a聽time聽(use聽hours聽<聽0聽to聽quit):聽;<br />聽聽聽聽聽聽聽聽cin聽>>聽hours聽>>聽minutes聽>>聽seconds;<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><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 </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">timetype.cpp</font><font face="Times New Roman, Times, Serif" size="3"> implementation file only needs to contain function definitions for the following member functions: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">Set</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">Increment</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">Write</font><font face="Times New Roman, Times, Serif" size="3">, and the default constructor. The other member functions do not need to be implemented yet. Now we compile the test driver and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">timetype.cpp</font><font face="Times New Roman, Times, Serif" size="3">, link the two object files, and execute the program. For input data we supply at least the four test cases discussed earlier. The program's output should match the desired results.</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">Now that we have tested the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">Increment</font><font face="Times New Roman, Times, Serif" size="3"> function, we can apply the same steps to the remaining class member functions. We can create a separate test driver for each function or we can write just one driver that tests all of the functions. The disadvantage of writing just one driver is that devising different combinations of input values to test several functions at once can quickly become complicated.</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">Before leaving the topic of testing a class, we must emphasize an important point. Even though a class has been tested thoroughly, it is still possible for bugs to arise. Let's look at two examples using the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">TimeType</font><font face="Times New Roman, Times, Serif" size="3"> class. The first example is the client statement</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">time.Set(24,聽0,聽0);</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_891.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_892</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_893.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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