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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_454</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_453.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_454</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_455.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 454</font></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">void聽Power(聽float聽聽base,<br />聽聽聽聽聽聽聽聽聽聽聽聽int聽聽聽聽exponent,<br />聽聽聽聽聽聽聽聽聽聽聽聽float&聽answer聽聽聽)<br />{<br />聽聽聽聽int聽i;<br /><br />聽聽聽聽answer聽=聽1.0;<br />聽聽聽聽i聽=聽1;<br />聽聽聽聽while聽(i聽<=聽exponent)<br />聽聽聽聽{<br />聽聽聽聽聽聽聽聽answer聽=聽answer聽*聽base;<br />聽聽聽聽聽聽聽聽i++;<br />聽聽聽聽}<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">9. You are given the following </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">Test</font><font face="Times New Roman, Times, Serif" size="3"> function and a C++ program in which the variables </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">a</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">b</font><font face="Times New Roman, Times, Serif" size="3">, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">c</font><font face="Times New Roman, Times, Serif" size="3">, and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">result</font><font face="Times New Roman, Times, Serif" size="3"> are declared to be of type </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">float</font><font face="Times New Roman, Times, Serif" size="3">. In the calling code, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">a</font><font face="Times New Roman, Times, Serif" size="3"> = -5.0, </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">b</font><font face="Times New Roman, Times, Serif" size="3"> = 0.1, and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">c</font><font face="Times New Roman, Times, Serif" size="3"> = 16.2. What is the value of </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">result</font><font face="Times New Roman, Times, Serif" size="3"> when each of the following calls returns?</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">float聽Test(聽float聽x,<br />聽聽聽聽聽聽聽聽聽聽聽聽float聽y,<br />聽聽聽聽聽聽聽聽聽聽聽聽float聽z聽)<br />{<br />聽聽聽聽if聽(x聽>聽y聽||聽y聽>聽z)<br />聽聽聽聽聽聽聽聽return聽0.5;<br />聽聽聽聽else<br />聽聽聽聽聽聽聽聽return聽-0.5;<br />}<br /><br />a.聽result聽=聽Test(5.2,聽5.3,聽5.6);<br />b.聽result聽=聽Test(fabs(a),聽b,聽c);</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">10. What is wrong with each of the following C++ function definitions?</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">a.聽void聽Test1(聽int聽m,<br />聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽int聽n聽)<br />聽聽聽{<br />聽聽聽聽聽聽return聽3聽*聽m聽+聽n;<br />聽聽聽}<br />b.聽float聽Test2(聽int聽聽聽i,<br />聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽float聽x聽)<br />聽聽聽{<br />聽聽聽聽聽聽i聽=聽i聽+聽7;<br />聽聽聽聽聽聽x聽=聽4.8聽+聽float(i);<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">11. Explain why it is risky to use a reference parameter as a formal parameter of a value-returning function.</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_453.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_454</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_455.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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