C++运算符优先级一览表

深藏阁楼爱情的钟 2024-04-17 11:19 79阅读 0赞

[VC++常用功能开发汇总（专栏文章列表，欢迎订阅，持续更新...）![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://blog.csdn.net/chenlycly/article/details/124272585][VC_..._icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_blog.csdn.net_chenlycly_article_details_124272585][C++软件异常排查从入门到精通系列教程（专栏文章列表，欢迎订阅，持续更新...）![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://blog.csdn.net/chenlycly/article/details/125529931][C_..._icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_blog.csdn.net_chenlycly_article_details_125529931][C++软件分析工具从入门到精通案例集锦（专栏文章正在更新中...）![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://blog.csdn.net/chenlycly/article/details/131405795][C_..._icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_blog.csdn.net_chenlycly_article_details_131405795][C/C++基础与进阶（专栏文章，持续更新中...）![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://blog.csdn.net/chenlycly/category\_11931267.html][C_C_..._icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_blog.csdn.net_chenlycly_category_11931267.html] 当一个复杂的表达式中包含了多个运算符时，要读懂表达式的含义，就需要搞清楚这些运算符的优先级。下面完整地罗列了所有C++运算符的优先级，以供查阅和参考。

<table> 
 <tbody> 
 <tr> 
 <td> Precedence </td> 
 <td> Operator </td> 
 <td> Description </td> 
 <td> Example </td> 
 <td> Associativity </td> 
 </tr> 
 <tr> 
 <td> 1 </td> 
 <td> () [] -&gt; . :: ++ -- </td> 
 <td> Grouping operator Array access Member access from a pointer Member access from an object Scoping operator Post-increment Post-decrement </td> 
 <td> (a + b) / 4; array[4] = 2; ptr-&gt;age = 34; obj.age = 34; Class::age = 2; for( i = 0; i &lt; 10; i++ ) ... for( i = 10; i &gt; 0; i-- ) ... </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 2 </td> 
 <td> ! ~ ++ -- - + * &amp; (type) <a href="http://www.cppreference.com/keywords/sizeof.html" rel="nofollow" title="sizeof">sizeof</a> </td> 
 <td> Logical negation Bitwise complement Pre-increment Pre-decrement Unary minus Unary plus Dereference Address of Cast to a given type Return size in bytes </td> 
 <td> if( !done ) ... flags = ~flags; for( i = 0; i &lt; 10; ++i ) ... for( i = 10; i &gt; 0; --i ) ... int i = -1; int i = +1; data = *ptr; address = &amp;obj; int i = (int) floatNum; int size = sizeof(floatNum); </td> 
 <td> right to left </td> 
 </tr> 
 <tr> 
 <td> 3 </td> 
 <td> -&gt;* .* </td> 
 <td> Member pointer selector Member pointer selector </td> 
 <td> ptr-&gt;*var = 24; obj.*var = 24; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 4 </td> 
 <td> * / % </td> 
 <td> Multiplication Division Modulus </td> 
 <td> int i = 2 * 4; float f = 10 / 3; int rem = 4 % 3; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 5 </td> 
 <td> + - </td> 
 <td> Addition Subtraction </td> 
 <td> int i = 2 + 3; int i = 5 - 1; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 6 </td> 
 <td> &lt;&lt; &gt;&gt; </td> 
 <td> Bitwise shift left Bitwise shift right </td> 
 <td> int flags = 33 &lt;&lt; 1; int flags = 33 &gt;&gt; 1; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 7 </td> 
 <td> &lt; &lt;= &gt; &gt;= </td> 
 <td> Comparison less-than Comparison less-than-or-equal-to Comparison greater-than Comparison geater-than-or-equal-to </td> 
 <td> if( i &lt; 42 ) ... if( i &lt;= 42 ) ... if( i &gt; 42 ) ... if( i &gt;= 42 ) ... </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 8 </td> 
 <td> == != </td> 
 <td> Comparison equal-to Comparison not-equal-to </td> 
 <td> if( i == 42 ) ... if( i != 42 ) ... </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 9 </td> 
 <td> &amp; </td> 
 <td> Bitwise AND </td> 
 <td> flags = flags &amp; 42; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 10 </td> 
 <td> ^ </td> 
 <td> Bitwise exclusive OR </td> 
 <td> flags = flags ^ 42; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 11 </td> 
 <td> | </td> 
 <td> Bitwise inclusive (normal) OR </td> 
 <td> flags = flags | 42; </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 12 </td> 
 <td> &amp;&amp; </td> 
 <td> Logical AND </td> 
 <td> if( conditionA &amp;&amp; conditionB ) ... </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 13 </td> 
 <td> || </td> 
 <td> Logical OR </td> 
 <td> if( conditionA || conditionB ) ... </td> 
 <td> left to right </td> 
 </tr> 
 <tr> 
 <td> 14 </td> 
 <td> ? : </td> 
 <td> Ternary conditional (if-then-else) </td> 
 <td> int i = (a &gt; b) ? a : b; </td> 
 <td> right to left </td> 
 </tr> 
 <tr> 
 <td> 15 </td> 
 <td> = += -= *= /= %= &amp;= ^= |= &lt;&lt;= &gt;&gt;= </td> 
 <td> Assignment operator Increment and assign Decrement and assign Multiply and assign Divide and assign Modulo and assign Bitwise AND and assign Bitwise exclusive OR and assign Bitwise inclusive (normal) OR and assign Bitwise shift left and assign Bitwise shift right and assign </td> 
 <td> int a = b; a += 3; b -= 4; a *= 5; a /= 2; a %= 3; flags &amp;= new_flags; flags ^= new_flags; flags |= new_flags; flags &lt;&lt;= 2; flags &gt;&gt;= 2; </td> 
 <td> right to left </td> 
 </tr> 
 <tr> 
 <td> 16 </td> 
 <td> , </td> 
 <td> Sequential evaluation operator </td> 
 <td> for( i = 0, j = 0; i &lt; 10; i++, j++ ) ... </td> 
 <td> left to right </td> 
 </tr> 
 </tbody> 
</table>

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