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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_246</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_245.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_246</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_247.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 246</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">12. The nested If structure below has five possible branches depending on the values read into </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">char</font><font face="Times New Roman, Times, Serif" size="3"> variables </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch1</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch2</font><font face="Times New Roman, Times, Serif" size="3">, and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch3</font><font face="Times New Roman, Times, Serif" size="3">. To test the structure, you need five sets of data, each set using a different branch. Create the five test data sets.</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="24" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></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">cin聽>>聽ch1聽>>聽ch2聽>>聽ch3;<br />if聽(ch1聽==聽ch2)<br />聽聽聽聽if聽(ch2聽==聽ch3)<br />聽聽聽聽聽聽聽聽cout聽<<聽All聽initials聽are聽the聽same.聽<<聽endl;<br />聽聽聽聽else<br />聽聽聽聽聽聽聽聽cout聽<<聽First聽two聽are聽the聽same.聽<<聽endl;<br />else聽if聽(ch2聽==聽ch3)<br />聽聽聽聽cout聽<<聽Last聽two聽are聽the聽same.聽<<聽endl;<br />else聽if聽(ch1聽==聽ch3)<br />聽聽聽聽cout聽<<聽First聽and聽last聽are聽the聽same.聽<<聽endl;<br />else<br />聽聽聽聽cout聽<<聽All聽initials聽are聽different.聽<<聽endl;</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="29" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></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">a. Test data set 1: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch1</font><font face="Times New Roman, Times, Serif" size="3"> =____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch2</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch3</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="29" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></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">b. Test data set 2: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch1</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch2</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch3</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="29" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></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">c. Test data set 3: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch1</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch2</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch3</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="29" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></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">d. Test data set 4: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch1</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch2</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch3</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="29" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></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">e. Test data set 5: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch1</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch2</font><font face="Times New Roman, Times, Serif" size="3"> =_____ </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch3</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">13. If </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">x</font><font face="Times New Roman, Times, Serif" size="3"> and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">y</font><font face="Times New Roman, Times, Serif" size="3"> are Boolean variables, do the following two expressions test the same condition?</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"><img src="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" border="0" width="24" height="1" alt="3e26ecb1b6ac508ae10a0e39d2fb98b2.gif" /></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td>⌨️ 快捷键说明
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