工具介紹：
                        
						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（最松散地結合）到最高的優先級（最緊密地結合）。

	
這意味著在一個表達式中，Python會首先計算表中較下面的運算符，然后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、除法與取余




+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






            

        

        

            

        

        
    




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