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運算符優(yōu)先級

發(fā)布時間：2020-07-05 13:55:21 來源：網絡 閱讀：235 作者：alterem 欄目：開發(fā)技術

Java 運算符優(yōu)先級
運算符 優(yōu)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(yōu)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(yōu)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(yōu)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(yōu)先級（從低到高）.

從最低的優(yōu)先級（最松散地結合）到最高的優(yōu)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(yōu)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(shù)
x.attribute 屬性參考
x[index] 下標
x[index:index] 尋址段
f(arguments...) 函數(shù)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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