C/C++ 操作符优先级
时间：2014-04-29 21:56:50
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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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