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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_142</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_141.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_142</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_143.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 142</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">Here are some examples that use a </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">char</font><font face="Times New Roman, Times, Serif" size="3"> variable </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ch</font><font face="Times New Roman, Times, Serif" size="3"> and three </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">int</font><font face="Times New Roman, Times, Serif" size="3"> variables, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">i</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">j</font><font face="Times New Roman, Times, Serif" size="3">, and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">k</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 cellpadding="0" cellspacing="0" border="0" width="100%"><tr><td height="12"></td></tr><tr><td><table cellspacing="0" width="538" cellpadding="7"><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Statements</i></font></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Contents After<br />Input</i></font></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Marker Position in<br />the Input Stream</i></font></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2">1.</font></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">957 34<img src="72a5b83b3b83c610e6911c571b400d71.gif" border="0" alt="sbox.gif" width="14" height="16" /> 1235\n<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">128聽96\n</font></td></tr><tr><td valign="top"><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="1"></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i聽>>聽j;</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">i聽=聽957,聽j聽=聽34</font></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">957<img src="72a5b83b3b83c610e6911c571b400d71.gif" border="0" alt="sbox.gif" width="14" height="16" /> 1235\n<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">128聽96\n</font></td></tr><tr><td valign="top"><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="1"></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.ignore(100,聽聽\n);</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">957聽34聽聽1235\n<br /></font><font face="Times New Roman, Times, Serif" size="2"><img src="d21d311830428cb6588f051002a8a417.gif" border="0" alt="one.gif" width="14" height="15" /> 28 96\n</font></td></tr><tr><td valign="top"><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="1"></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k;</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">k聽=聽128</font></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">957聽34聽聽1235\n<br /></font><font face="Times New Roman, Times, Serif" size="2">128<img src="72a5b83b3b83c610e6911c571b400d71.gif" border="0" alt="sbox.gif" width="14" height="16" /> 96\n</font></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2">2.</font></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><img src="1c9eff0a24c07a6c21609e9186b427f5.gif" border="0" alt="a.gif" width="15" height="16" /> 22 B 16 C 19\n</font></td></tr><tr><td valign="top"><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="1"></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ch;</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">ch聽=聽A</font></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">A<img src="72a5b83b3b83c610e6911c571b400d71.gif" border="0" alt="sbox.gif" width="14" height="16" /> 22 B 16 C 19\n</font></td></tr><tr><td valign="top"><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="1"></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.ignore(100,聽B);</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">A 22 B<img src="72a5b83b3b83c610e6911c571b400d71.gif" border="0" alt="sbox.gif" width="14" height="16" /> 16 C 19\n</font></td></tr><tr><td valign="top"><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="1"></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i;</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">i聽=聽16</font></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">A 22 B 16<img src="72a5b83b3b83c610e6911c571b400d71.gif" border="0" alt="sbox.gif" width="14" height="16" /> C 19\n</font></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2">3.</font></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><img src="1c9eff0a24c07a6c21609e9186b427f5.gif" border="0" alt="a.gif" width="15" height="16" /> BCDEF\n</font></td></tr><tr><td valign="top"><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="1"></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.ignore(2,聽\n);</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">AB<img src="5613977a71d9e2a180edebe594a99e44.gif" border="0" alt="c.gif" width="15" height="17" /> DEF\n</font></td></tr><tr><td valign="top"><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="1"></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ch;</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td valign="top"><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">ch聽=聽C</font></td><td valign="top"><font face="Times New Roman, Times, Serif" size="2">ABC<img src="fccb08e122f0c662834c84789ebb1d78.gif" border="0" alt="d.gif" width="14" height="15" /> EF\n</font></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">Example (1) shows the most common use of the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ignore</font><font face="Times New Roman, Times, Serif" size="3"> function, which is to skip the rest of the data on the current input line. Example (2) demonstrates the use of a character other than \n as the second parameter. We skip over all input characters until a B has been found, then read the next input number into </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">i</font><font face="Times New Roman, Times, Serif" size="3">. In both (1) and (2), we are focusing on the second parameter to the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ignore</font><font face="Times New Roman, Times, Serif" size="3"> function, and we arbitrarily choose any large number like 100 for the first parameter. In (3), we change our focus and concentrate on the first parameter. Our intention is to skip the next two input characters on the current line.</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="17"></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">Interactive Input/Output</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">Remember in Chapter 1 that we defined an interactive program as one in which the user communicates directly with the computer. Many of the programs that you write will be interactive. There is a certain etiquette in-</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_141.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_142</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_143.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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