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C++ 運算符優先級列表

http://www.cppreference.com/operator_precedence.html

Precedence	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

posted on 2006-06-08 09:33 brent 閱讀(198879) 評論(18) 編輯收藏引用所屬分類: C++

@zhuang563
if(a==0 || a==1 && b==0 || a==2 && b==1)
相當于
if(a==0 || (a==1 && b==0) || (a==2 && b==1) )
對于||來說，只要遇到一個表達式是true, 后面的表達式都不會再判斷， ||范圍的表達式為true。
而對于&&來說，只要遇到一個表達式是false，后面的表達式都不會再判斷， &&范圍的整個表達式為false。
你可以寫一些代碼自己調試看看就知道了。回復更多評論

# re: C++ 運算符優先級列表 2011-06-16 19:05 林緣雨夢

我編了個口訣,幫忙記憶
闊框點箭域先鋒 ① () [] . -> ::
塞外干旱煩政府 ②sizeof ! ~ + -
家家戶戶限制米 ++ -- (type型) &(取址) *
救災捐米一點米 ③->* .*
時余曾促物價減 ④% * / ⑤+ -
左鄰右舍來相告 ⑥<< >>
老大小凳換大凳 ⑦> < <= >=
把事說明等不等 ⑧== !=
久雨適宜事宜否 ⑨&⑩^⑾|
十二雨下十三過 ⑿&&⒀||
三夢睡醒燈都滅 ⒁:?(三目運算) ⒂= +=...⒃,(逗號)
回復更多評論

# re: C++ 運算符優先級列表 2011-09-09 12:31 幻の上帝

這張表還是有問題的。
嚴格來說::不算operator。::和析構函數的~是同一個性質的東西，是punctuator。
討論優先級的話，::確實在最前。它參與組成了primary-expression。而操作符至少組成postfix-expression。回復更多評論

# re: C++ 運算符優先級列表 2012-03-18 07:45 Carl

你太有才了，Very Smart 回復更多評論

# re: C++ 運算符優先級列表 2012-03-18 08:49 Carl

請問各位大俠，# 與##是什么運算符，有什么作用？回復更多評論

# re: C++ 運算符優先級列表 2012-04-01 16:02 MassachusettsIT

很好，很強大！！！回復更多評論

# re: C++ 運算符優先級列表 2012-04-11 16:46 沉默的羔羊

謝謝分享，收藏了回復更多評論

# re: C++ 運算符優先級列表 2012-04-17 10:41 呵呵

多謝分享回復更多評論

# re: C++ 運算符優先級列表 2012-05-29 01:24 lalallalaGERUSA

hi ^^ LALALLAALLALALAL 回復更多評論

# re: C++ 運算符優先級列表 2012-06-02 19:31 carinabarra@libero.it

Ve puzza la chiappa 回復更多評論

# re: C++ 運算符優先級列表 2012-08-02 07:53 +++++++++++

+++++++++++ 回復更多評論

# re: C++ 運算符優先級列表 2012-11-10 10:36 ererer

&GetDocument()->m_sampleSet;

請問上面都語句對GetDocument()是先取地址呢，還是先進行箭頭操作？回復更多評論

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# re: C++ 運算符優先級列表 2009-04-17 20:16 創意產品網

# re: C++ 運算符優先級列表 2009-10-14 19:50 Xiaodu

# re: C++ 運算符優先級列表 2009-12-25 10:31 rock

# re: C++ 運算符優先級列表 2010-01-09 21:20 xgenvn

# re: C++ 運算符優先級列表 2010-05-09 11:42 gkhdgfg

# re: C++ 運算符優先級列表 2010-10-28 09:47 zhuang563

# re: C++ 運算符優先級列表 2010-10-29 11:17 brent