📄 page_394.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>page_394</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_393.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_394</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_395.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 394</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">the While-loop body labeled Block3, declared within function Block2, contains its own local variable declarations.</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="Courier New, Courier, Mono New, Courier, Mono" size="2">//聽ScopeRules聽program<br /><br />#include聽<iostream.h><br /><br />void聽Block1(聽int,聽char&聽);<br />void聽Block2();<br /><br />int聽聽a1;聽聽聽聽聽聽聽聽聽聽//聽One聽global聽variable<br />char聽a2;聽聽聽聽聽聽聽聽聽聽//聽Another聽global聽variable<br /><br />int聽main()<br />{<br />聽聽聽聽.<br />聽聽聽聽.<br />聽聽聽聽.<br />}<br /><br />//******************************************************************<br /><br />void聽Block1(聽int聽聽聽a1,聽聽聽聽聽聽聽聽聽聽//聽Prevents聽access聽to聽global聽a1<br />聽聽聽聽聽聽聽聽聽聽聽聽聽char&聽b2聽)聽聽聽聽聽聽聽聽聽//聽Has聽same聽scope聽as聽c1聽and聽d2<br />{<br />聽聽聽聽int聽c1;聽聽聽聽聽聽聽聽//聽A聽variable聽local聽to聽Block1<br />聽聽聽聽int聽d2;聽聽聽聽聽聽聽聽//聽Another聽variable聽local聽to聽Block1<br />聽聽聽聽聽.<br />聽聽聽聽聽.<br />聽聽聽聽聽.<br />}<br /><br />//******************************************************************<br /><br />void聽Block2()<br />{<br />聽聽聽聽int聽a1;聽聽聽聽聽聽聽聽//聽Prevents聽access聽to聽global聽a1<br />聽聽聽聽int聽b2;聽聽聽聽聽聽聽聽//聽Local聽to聽Block2;聽no聽conflict聽with聽b2聽in聽Block1<br /><br />聽聽聽聽while聽()<br />聽聽聽聽{聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽Block3<br />聽聽聽聽int聽c1;聽聽聽聽聽聽聽聽//聽Local聽to聽Block3;聽no聽conflict聽with聽c1聽in聽Block1<br />聽聽聽聽int聽b2;聽聽聽聽聽聽聽聽//聽Prevents聽nonlocal聽access聽to聽b2聽in聽Block2;聽no<br />聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽//聽聽聽conflict聽with聽b2聽in聽Block1<br />聽聽聽聽聽聽.<br />聽聽聽聽聽聽.<br />聽聽聽聽聽聽.<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">Let's look at the ScopeRules program in terms of the blocks it defines and see just what these rules mean. Figure 81 shows the headings and declara-</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_393.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_394</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_395.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -