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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_510</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_509.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_510</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_511.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 510</font></td></tr></table><table cellpadding="0" cellspacing="0" border="0" width="100%"><tr><td height="12"></td></tr><tr><td><table cellspacing="0" width="528" cellpadding="7"><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Operator</i></font></td><td colspan="2" valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Remarks</i></font></td></tr><tr><td colspan="3" valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Combined assignment operators</i></font></td></tr><tr><td colspan="3" 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="3">+=</font><font face="Times New Roman, Times, Serif" size="2"> Add and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">-=</font><font face="Times New Roman, Times, Serif" size="2"> Subtract and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">*=</font><font face="Times New Roman, Times, Serif" size="2"> Multiply and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">/=</font><font face="Times New Roman, Times, Serif" size="2"> Divide and assign</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr><tr><td colspan="3" valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Increment and decrement operators</i></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="3">++</font><font face="Times New Roman, Times, Serif" size="2"> Pre-increment<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">++</font><font face="Times New Roman, Times, Serif" size="2"> Post-increment<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">--</font><font face="Times New Roman, Times, Serif" size="2"> Pre-decrement<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">--</font><font face="Times New Roman, Times, Serif" size="2"> Post-decrement</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td colspan="2" valign="top"><font face="Times New Roman, Times, Serif" size="2">Example: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">++someVar<br /></font><font face="Times New Roman, Times, Serif" size="2">Example: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">someVar++<br /></font><font face="Times New Roman, Times, Serif" size="2">Example: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">--someVar<br /></font><font face="Times New Roman, Times, Serif" size="2">Example: </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">someVar--</font></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Bitwise operators</i></font></td><td colspan="2" valign="top"><font face="Times New Roman, Times, Serif" size="2">Integer operands only</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="3"><</font><font face="Times New Roman, Times, Serif" size="2"> Left shift<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">>></font><font face="Times New Roman, Times, Serif" size="2"> Right shift<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">&</font><font face="Times New Roman, Times, Serif" size="2"> Bitwise AND<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">|</font><font face="Times New Roman, Times, Serif" size="2"> Bitwise OR</font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">锚</font><font face="Times New Roman, Times, Serif" size="2"> Bitwise EXCLUSIVE OR<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">~</font><font face="Times New Roman, Times, Serif" size="2"> Complement (invert all bits)</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td colspan="2" valign="top"></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>More combined assignment operators</i></font></td><td colspan="2" valign="top"><font face="Times New Roman, Times, Serif" size="2">Integer operands only</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="3">%=</font><font face="Times New Roman, Times, Serif" size="2"> Modulus and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3"><=</font><font face="Times New Roman, Times, Serif" size="2"> Shift left and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">>>=</font><font face="Times New Roman, Times, Serif" size="2"> Shift right and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">&=</font><font face="Times New Roman, Times, Serif" size="2"> Bitwise AND and assign<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">|=</font><font face="Times New Roman, Times, Serif" size="2"> Bitwise OR and assign<br />锚= Bitwise EXCLUSIVE OR and assign</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td colspan="2" valign="top"></td></tr><tr><td valign="top"><font face="Times New Roman, Times, Serif" size="2"><i>Other operators</i></font></td><td colspan="2" valign="top"></td></tr><tr><td valign="bottom"><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="3">()</font><font face="Times New Roman, Times, Serif" size="3"> Cast<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">sizeof</font><font face="Times New Roman, Times, Serif" size="3"> Size of operand in bytes<br /></font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">?:</font><font face="Times New Roman, Times, Serif" size="3"> Conditional operator</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td><td colspan="2" valign="bottom"><font face="Times New Roman, Times, Serif" size="2">Form:</font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">sizeof</font><font face="Times New Roman, Times, Serif" size="2"> Expr or </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">sizeof</font><font face="Times New Roman, Times, Serif" size="2">(Type)<br />Form:Expr1? Expr2: Expr3</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">The operators in this table, along with those you are already familiar with, comprise mostbut not allof the C++operators. We introduce a few more operators in later chapters as the need arises.</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"><i>Assignment Operators and Assignment Expressions</i></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">C++ has several assignment operators. The equal sign (</font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">=</font><font face="Times New Roman, Times, Serif" size="3">) is the basic assignment operator. When combined with its two operands, it forms an assignment expression (<i>not</i> an assignment statement). Every assignment expression has:</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_509.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_510</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_511.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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