C++运算符优先级
2012-10-19 15:44
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C++ 运算符优先级列表
http://www.cppreference.com/operator_precedence.htmlPrecedence | Operator | Description | Example | Associativity |
---|---|---|---|---|
1 | () [] -> . :: ++ -- | Grouping operator Array access Member access from a pointer Member access from an object Scoping operator Post-increment Post-decrement | (a + b) / 4; array[4] = 2; ptr->age = 34; obj.age = 34; Class::age = 2; for( i = 0; i < 10; i++ ) ... for( i = 10; i > 0; i-- ) ... | left to right |
2 | ! ~ ++ -- - + * & (type) sizeof | Logical negation Bitwise complement Pre-increment Pre-decrement Unary minus Unary plus Dereference Address of Cast to a given type Return size in bytes | if( !done ) ... flags = ~flags; for( i = 0; i < 10; ++i ) ... for( i = 10; i > 0; --i ) ... int i = -1; int i = +1; data = *ptr; address = &obj; int i = (int) floatNum; int size = sizeof(floatNum); | right to left |
3 | ->* .* | Member pointer selector Member pointer selector | ptr->*var = 24; obj.*var = 24; | left to right |
4 | * / % | Multiplication Division Modulus | int i = 2 * 4; float f = 10 / 3; int rem = 4 % 3; | left to right |
5 | + - | Addition Subtraction | int i = 2 + 3; int i = 5 - 1; | left to right |
6 | << >> | Bitwise shift left Bitwise shift right | int flags = 33 << 1; int flags = 33 >> 1; | left to right |
7 | < <= > >= | Comparison less-than Comparison less-than-or-equal-to Comparison greater-than Comparison geater-than-or-equal-to | if( i < 42 ) ... if( i <= 42 ) ... if( i > 42 ) ... if( i >= 42 ) ... | left to right |
8 | == != | Comparison equal-to Comparison not-equal-to | if( i == 42 ) ... if( i != 42 ) ... | left to right |
9 | & | Bitwise AND | flags = flags & 42; | left to right |
10 | ^ | Bitwise exclusive OR | flags = flags ^ 42; | left to right |
11 | | | Bitwise inclusive (normal) OR | flags = flags | 42; | left to right |
12 | && | Logical AND | if( conditionA && conditionB ) ... | left to right |
13 | || | Logical OR | if( conditionA || conditionB ) ... | left to right |
14 | ? : | Ternary conditional (if-then-else) | int i = (a > b) ? a : b; | right to left |
15 | = += -= *= /= %= &= ^= |= <<= >>= | 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 | int a = b; a += 3; b -= 4; a *= 5; a /= 2; a %= 3; flags &= new_flags; flags ^= new_flags; flags |= new_flags; flags <<= 2; flags >>= 2; | right to left |
16 | , | Sequential evaluation operator | for( i = 0, j = 0; i < 10; i++, j++ ) ... | left to right |
我编了个口诀,帮忙记忆
阔框点箭域先锋 ① () [] . -> ::
塞外干旱烦政府 ②sizeof ! ~ + -
家家户户限制米 ++ -- (type型) &(取址) *
救灾捐米一点米 ③->* .*
时余曾促物价减 ④% * / ⑤+ -
左邻右舍来相告 ⑥<< >>
老大小凳换大凳 ⑦> < <= >=
把事说明等不等 ⑧== !=
久雨适宜事宜否 ⑨&⑩^⑾|
十二雨下十三过 ⑿&&⒀||
三梦睡醒灯都灭 ⒁:?(三目运算) ⒂= +=...⒃,(逗号)