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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_272</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_271.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_272</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_273.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 272</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="698" 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="Courier New, Courier, Mono New, Courier, Mono" size="2">聽聽聽else聽if聽(currChar聽!=聽!)聽聽聽聽聽//聽Rule:聽If聽currChar聽isn't<br />聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽聽聽聽聽聽聽聽聽=聽or聽!,<br />聽聽聽聽聽聽exclamEncountered聽=聽FALSE;聽//聽聽聽聽聽switch聽states<br />}<br />else聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽State聽==聽no聽!聽encountered<br />聽聽聽if聽(currChar聽==聽!)聽聽聽聽聽聽聽聽聽聽//聽Rule:聽If聽currChar聽is聽!,<br />聽聽聽聽聽聽exclamEncountered聽=聽TRUE;聽聽//聽聽聽聽聽聽聽switch聽states</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">Next, we wrap these state tests and transition rules in a loop that applies them to each input character. In addition, we must specify a starting state for the finite state machine by initializing all of the state variables. In this case, we just have to set </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">exclamEncountered</font><font face="Times New Roman, Times, Serif" size="3"> to </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">FALSE</font><font face="Times New Roman, Times, Serif" size="3">. Here's the new program:</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">//******************************************************************<br />//聽FiniteState聽program<br />//聽This聽program聽counts聽the聽occurrences聽of聽!=聽in聽a聽data聽file<br />//聽by聽simulating聽a聽finite聽state聽machine<br />//******************************************************************<br />#include聽<iostream.h><br />#include聽<fstream.h>聽聽聽//聽For聽file聽I/O<br /><br />typedef聽int聽Boolean;<br />const聽Boolean聽TRUE聽=聽1;<br />const聽Boolean聽FALSE聽=聽0;<br /><br />int聽main()<br />{<br />聽聽聽聽int聽聽聽聽聽聽count;聽聽聽聽聽聽聽聽聽聽聽聽聽//聽Number聽of聽!=聽operators<br />聽聽聽聽char聽聽聽聽聽currChar;聽聽聽聽聽聽聽聽聽聽//聽Current聽character<br />聽聽聽聽Boolean聽exclamEncountered;聽聽//聽State聽variable<br />聽聽聽聽ifstream聽inFile;聽聽聽聽聽聽聽聽聽聽聽聽//聽Data聽file<br /><br />聽聽聽聽inFile.open(myfile.dat);<br />聽聽聽聽if聽(聽!inFile聽)<br />聽聽聽聽{<br />聽聽聽聽聽聽聽cout聽<<聽**聽Can't聽open聽input聽file聽**聽<<聽endl;<br />聽聽聽聽聽聽聽return聽1;<br />聽聽聽聽}<br />聽聽聽聽count聽=聽0;<br />聽聽聽聽exclamEncountered聽=聽FALSE;聽聽聽聽聽聽聽聽聽聽//聽Initialize聽starting聽state<br />聽聽聽聽inFile.get(currChar);<br />聽聽聽聽while聽(inFile)<br />聽聽聽聽{<br />聽聽聽聽聽聽聽if聽(exclamEncountered)聽聽聽聽聽聽聽聽聽聽聽//聽State聽==聽!聽encountered<br />聽聽聽聽聽聽聽{<br />聽聽聽聽聽聽聽聽聽聽if聽(currChar聽==聽=)聽聽聽聽聽聽聽聽聽聽//聽Rule:聽If聽currChar聽is聽=,<br />聽聽聽聽聽聽聽聽聽聽{<br />聽聽聽聽聽聽聽聽聽聽聽聽聽count++;聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽聽聽聽聽聽聽increment聽count<br />聽聽聽聽聽聽聽聽聽聽聽聽聽exclamEncountered聽=聽FALSE;聽//聽聽聽聽聽聽聽and聽switch聽states<br />聽聽聽聽聽聽聽聽聽聽}</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 continues 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_271.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_272</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_273.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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