操作符优先级

Precedence	Operator	Description	Associativity
1	++ –	Suffix/postfix increment and decrement	Left-to-right
1	()	Function call	Left-to-right
1	[]	Array subscripting	Left-to-right
1	.	Structure and union member access	Left-to-right
1	->	Structure and union member access through pointer	Left-to-right
1	(type){list}	Compound literal(C99)	Left-to-right
2	++ –	Prefix increment and decrement	Right-to-left
2	+ -	Unary plus and minus	Right-to-left
2	! ~	Logical NOT and bitwise NOT	Right-to-left
2	(type)	Cast	Right-to-left
2	*	Indirection (dereference)	Right-to-left
2	&	Address-of	Right-to-left
2	sizeof	Size-of	Right-to-left
2	_Alignof	Alignment requirement(C11)	Right-to-left
3	* / %	Multiplication, division, and remainder	Left-to-right
4	+ -	Addition and subtraction	Left-to-right
5	<< >>	Bitwise left shift and right shift	Left-to-right
6	< <=	For relational operators < and ≤ respectively	Left-to-right
6	> >=	For relational operators > and ≥ respectively	Left-to-right
7	== !=	For relational = and ≠ respectively	Left-to-right
8	&	Bitwise AND	Left-to-right
9	^	Bitwise XOR (exclusive or)	Left-to-right
10	|	Bitwise OR (inclusive or)	Left-to-right
11	&&	Logical AND	Left-to-right
12	||	Logical OR	Left-to-right
13	?:	Ternary conditional	Right-to-left
14	=	Simple assignment	Right-to-left
14	+= -=	Assignment by sum and difference	Right-to-left
14	*= /= %=	Assignment by product, quotient, and remainder	Right-to-left
14	<<= >>=	Assignment by bitwise left shift and right shift	Right-to-left
14	&= ^= |=	Assignment by bitwise AND, XOR, and OR	Right-to-left
15	,	Comma	Left-to-right