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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_633</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_632.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_633</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_634.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 633</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">聽聽聽聽dataFile.open("text.dat");<br />聽聽聽聽if聽(聽!dataFile聽)<br />聽聽聽聽{<br />聽聽聽聽聽聽聽聽cout聽<<聽"**聽Can't聽open聽input聽file聽**"聽<聽endl;<br />聽聽聽聽聽聽聽聽return聽1;<br />聽聽聽聽}<br /><br />聽聽聽聽ZeroFreqCount(freqCount);<br /><br />聽聽聽聽//聽Keep聽reading聽and聽counting聽until聽no聽more聽characters<br /><br />聽聽聽聽dataFile.get(inputChar);聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽Don't聽skip聽whitespace<br />聽聽聽聽while聽(dataFile)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While聽not聽EOF...<br />聽聽聽聽{<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For聽all聽previous聽values聽of聽inputChar,<br />聽聽聽聽聽聽聽聽聽聽聽聽//聽聽聽聽聽freqCount聽contains聽the聽counts聽of聽printable聽chars<br /><br />聽聽聽聽聽聽聽聽if聽(isprint(inputChar))<br />聽聽聽聽聽聽聽聽聽聽聽聽freqCount[inputChar]++;<br />聽聽聽聽聽聽聽聽dataFile.get(inputChar);聽聽聽聽聽聽聽聽聽聽聽聽//聽Don't聽skip聽whitespace<br />聽聽聽聽}<br /><br />聽聽聽聽Print(freqCount);<br />聽聽聽聽return聽0;<br />}<br /><br />//******************************************************************<br /><br />void聽ZeroFreqCount(聽/*聽out聽*/聽int聽freqCount[]聽)聽聽聽聽//聽Zeroed聽list<br /><br />//聽Zeros聽out聽positions聽MIN-CHAR聽through聽MAX_CHAR聽of聽freqCount<br /><br />//聽Postcondition:<br />//聽聽聽聽聽freqCount聽[MIN_CHAR..MAX-CHAR]聽==聽0<br /><br />{<br />聽聽聽聽char聽index;聽聽//聽Loop聽control聽and聽index聽variable<br /><br />聽聽聽聽for聽(index聽=聽MIN_CHAR;聽index聽<=聽MAX-CHAR;聽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freqCount[MIM_CHAR..index-1]聽==聽0<br />聽聽聽聽聽聽聽聽聽聽聽聽//聽聽&&聽MIN_CHAR聽<=聽index聽<=聽MAX_CHAR+1<br /><br />聽聽聽聽聽聽聽聽freqCount[index]聽=聽0;<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_632.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_633</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_634.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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