C Operator Precedence
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A tabela a seguir mostra a precedência ea associatividade dos operadores C. Operadores são listados de cima para baixo, em ordem decrescente de precedência.
Original:
The following table lists the precedence and associativity of C operators. Operators are listed top to bottom, in descending precedence.
The text has been machine-translated via Google Translate.
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| 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 |
Ao analisar uma expressão, um operador que está listado em alguma linha será obrigado apertado (como se por parênteses) para os seus argumentos do que qualquer operador que está listado em uma linha mais abaixo.
Original:
When parsing an expression, an operator which is listed on some row will be bound tighter (as if by parentheses) to its arguments than any operator that is listed on a row further below it.
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Operadores que estão na mesma célula (pode haver várias linhas de operadores listados em uma célula) têm a mesma precedência e são agrupados em determinada direção. Por exemplo, a expressão
a=b=c é analisado como a=(b=c), e não como (a=b)=c devido a direita para a esquerda associatividade. Note-se que isto não afecta a ordem de avaliação das subexpressões a, b, e c.Original:
Operators that are in the same cell (there may be several rows of operators listed in a cell) have the same precedence and are grouped in the given direction. For example, the expression
a=b=c is parsed as a=(b=c), and not as (a=b)=c because of right-to-left associativity. Note that this does not affect the ordem de avaliação of the subexpressions a, b, and c.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Original:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.