概述
-
优先级从大到小
| Level | Precedence group | Operator | Description | Grouping |
|---|---|---|---|---|
| 1 | Scope | :: | scope qualifier | Left-to-right |
| 2 | Postfix (unary) | ++ -- | postfix increment / decrement | Left-to-right |
() | functional forms | |||
[] | subscript | |||
. -> | member access | |||
| 3 | Prefix (unary) | ++ -- | prefix increment / decrement | Right-to-left |
~ ! | bitwise NOT / logical NOT | |||
+ - | unary prefix | |||
& * | reference / dereference | |||
new delete | allocation / deallocation | |||
sizeof | parameter pack | |||
(type) | C-style type-casting | |||
| 4 | Pointer-to-member | .* ->* | access pointer | Left-to-right |
| 5 | Arithmetic: scaling | * / % | multiply, divide, modulo | Left-to-right |
| 6 | Arithmetic: addition | + - | addition, subtraction | Left-to-right |
| 7 | Bitwise shift | << >> | shift left, shift right | Left-to-right |
| 8 | Relational | < > <= >= | comparison operators | Left-to-right |
| 9 | Equality | == != | equality / inequality | Left-to-right |
| 10 | And | & | bitwise AND | Left-to-right |
| 11 | Exclusive or | ^ | bitwise XOR | Left-to-right |
| 12 | Inclusive or | | | bitwise OR | Left-to-right |
| 13 | Conjunction | && | logical AND | Left-to-right |
| 14 | Disjunction | || | logical OR | Left-to-right |
| 15 | Assignment-level expressions | = *= /= %= += -= | assignment / compound assignment | Right-to-left |
?: | conditional operator | |||
| 16 | Sequencing | , | comma separator | Left-to-right |
- 当一个表达式有两个具有相同优先级的运算符时，分组决定首先计算哪个运算符: 从左到右还是从右到左。
- 将所有子语句括在圆括号中(即使是那些因其优先级而不必要的子语句)可以提高代码的可读性。
参考网址
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