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C/C++ 操作符优先级

2024-07-01 23:34:42   224人阅读

不能光转贴，有空要熟悉之后，要写点心得。现在发现 . 的优先级确实很高。

C：

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

C++：

 

 

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
= 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
16 throw Throw operator (for exceptions)
17 , Comma Left-to-right

很有意思的几个举例：

http://www.cnblogs.com/maowang1991/archive/2012/12/07/2807086.html


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