開發相關-運算符優先級

Java 運算符優先級

運算符	優先級
postfix	expr++ expr--
unary	++expr --expr +expr -expr ~ !
multiplicative	* / %
additive	+ -
shift	<< >> >>>
relational	< > <= >= instanceof
equality	== !=
bitwise AND	&
bitwise exclusive OR	^
bitwise inclusive OR	|
logical AND	&&
logical OR	||
ternary	? :
assignment	= += -= *= /= %= &= ^= |= <<= >>= >>>=

C++運算符優先級

Precedence	Operator	Description	Associativity
1	::	Scope resolution	Left-to-right
2	++   --	Suffix/postfix increment and decrement
	()	Function call
	[]	Array subscripting
	.	Element selection by reference
	−>	Element selection through pointer
3	++   --	Prefix increment and decrement	Right-to-left
	+   −	Unary plus and minus
	!   ~	Logical NOT and bitwise NOT
	(type)	Type cast
	*	Indirection (dereference)
	&	Address-of
	sizeof	Size-of
	new, new[]	Dynamic memory allocation
	delete, delete[]	Dynamic memory deallocation
4	.*   ->*	Pointer to member	Left-to-right
5	*   /   %	Multiplication, division, and remainder
6	+   −	Addition and subtraction
7	<<   >>	Bitwise left shift and right shift
8	<   <=	For relational operators < and ≤ respectively
	>   >=	For relational operators > and ≥ respectively
9	==   !=	For relational = and ≠ respectively
10	&	Bitwise AND
11	^	Bitwise XOR (exclusive or)
12	|	Bitwise OR (inclusive or)
13	&&	Logical AND
14	||	Logical OR
15	?:	Ternary conditional	Right-to-Left
16	=	Direct assignment (provided by default for C++ classes)
	+=   −=	Assignment by sum and difference
	*=   /=   %=	Assignment by product, quotient, and remainder
	<<=   >>=	Assignment by bitwise left shift and right shift
	&=   ^=   |=	Assignment by bitwise AND, XOR, and OR
17	throw	Throw operator (for exceptions)
18	,	Comma	Left-to-right

C語言運算符優先級

Precedence	Operator	Description	Associativity
1	++ --	Suffix/postfix increment and decrement	Left-to-right
	()	Function call
	[]	Array subscripting
	.	Structure and union member access
	−>	Structure and union member access through pointer
	(type){list}	Compound literal(C99)
2	++ --	Prefix increment and decrement	Right-to-left
	+ −	Unary plus and minus
	! ~	Logical NOT and bitwise NOT
	(type)	Type cast
	*	Indirection (dereference)
	&	Address-of
	sizeof	Size-of
	_Alignof	Alignment requirement(C11)
3	* / %	Multiplication, division, and remainder	Left-to-right
4	+ −	Addition and subtraction
5	<< >>	Bitwise left shift and right shift
6	< <=	For relational operators < and ≤ respectively
	> >=	For relational operators > and ≥ respectively
7	== !=	For relational = and ≠ respectively
8	&	Bitwise AND
9	^	Bitwise XOR (exclusive or)
10	|	Bitwise OR (inclusive or)
11	&&	Logical AND
12	||	Logical OR
13	?:	Ternary conditional	Right-to-Left
14	=	Simple assignment
	+= −=	Assignment by sum and difference
	*= /= %=	Assignment by product, quotient, and remainder
	<<= >>=	Assignment by bitwise left shift and right shift
	&= ^= |=	Assignment by bitwise AND, XOR, and OR
15	,	Comma	Left-to-right

PHP運算符優先級

結合方向	運算符	附加信息
非結合	clone new	clone 和 new
左	[	array()
非結合	++ --	遞增／遞減運算符
非結合	~ - (int) (float) (string) (array) (object) (bool) @	類型
非結合	instanceof	類型
右結合	!	邏輯操作符
左	* / %	算術運算符
左	+ - .	算術運算符 和 字符串運算符
左	<< >>	位運算符
非結合	< <= > >= <>	比較運算符
非結合	== != === !==	比較運算符
左	&	位運算符 和 引用
左	^	位運算符
左	|	位運算符
左	&&	邏輯運算符
左	||	邏輯運算符
左	? :	三元運算符
右	= += -= *= /= .= %= &= |= ^= <<= >>=	賦值運算符
左	and	邏輯運算符
左	xor	邏輯運算符
左	or	邏輯運算符
左	,	多處用到

這個表給出Python的運算符優先級（從低到高）.

從最低的優先級（最鬆散地結合）到最高的優先級（最緊密地結合）。

這意味着在一個表達式中，Python會首先計算表中較下面的運算符，然後在計算列在表上部的運算符。

Python 運算符優先級

運算符	描述
lambda	Lambda表達式
or	布爾“或”
and	布爾“與”
not x	布爾“非”
in，not in	成員測試
is，is not	同一性測試
<，<=，>，>=，!=，==	比較
|	按位或
^	按位異或
&	按位與
<<，>>	移位
+，-	加法與減法
*，/，%	乘法、除法與取餘
+x，-x	正負號
~x	按位翻轉
**	指數
x.attribute	屬性參考
x[index]	下標
x[index:index]	尋址段
f(arguments...)	函數調用
(experession,...)	綁定或元組顯示
[expression,...]	列表顯示
{key:datum,...}	字典顯示
'expression,...'	字符串轉換