C、C++運算子優先順序列表

 

C、C++運算子優先順序列表1.C語言運算子優先順序

運算子按照優先順序大小由上向下排列，在同一行的運算子具有相同優先順序。第二行是所有的一元運算子。
 

運算子	解釋	結合方式
() [] -> .	括弧（函數等），數組，兩種結構成員訪問	由左向右
! ~ ++ -- + -  * & (類型) sizeof	否定，按位否定，增量，減量，加號或減號， 間接，取地址，類型轉換，求大小	由右向左
* / %	乘，除，模數	由左向右
+ -	加，減	由左向右
<< >>	左移，右移	由左向右
< <= >= >	小於，小於等於，大於等於，大於	由左向右
== !=	等於，不等於	由左向右
&	按位與	由左向右
^	按位異或	由左向右
|	按位或	由左向右
&&	邏輯與	由左向右
||	邏輯或	由左向右
? :	條件	由右向左
= += -= *= /=  &= ^= |= <<= >>=	各種賦值	由右向左
,	逗號（順序）	由左向右

 

2.C++運算子優先順序

Precedence	Operator	Description	Example	Associativity
1	() [] -> . :: ++ --	Grouping operator Array access Member access from a pointer Member access from an object Scoping operator Post-increment Post-decrement	(a + b) / 4; array[4] = 2; ptr->age = 34; obj.age = 34; Class::age = 2; for( i = 0; i < 10; i++ ) ... for( i = 10; i > 0; i-- ) ...	left to right
2	! ~ ++ -- - + * & (type) sizeof	Logical negation Bitwise complement Pre-increment Pre-decrement Unary minus Unary plus Dereference Address of Cast to a given type Return size in bytes	if( !done ) ... flags = ~flags; for( i = 0; i < 10; ++i ) ... for( i = 10; i > 0; --i ) ... int i = -1; int i = +1; data = *ptr; address = &obj; int i = (int) floatNum; int size = sizeof(floatNum);	right to left
3	->* .*	Member pointer selector Member pointer selector	ptr->*var = 24; obj.*var = 24;	left to right
4	* / %	Multiplication Division Modulus	int i = 2 * 4; float f = 10 / 3; int rem = 4 % 3;	left to right
5	+ -	Addition Subtraction	int i = 2 + 3; int i = 5 - 1;	left to right
6	<< >>	Bitwise shift left Bitwise shift right	int flags = 33 << 1; int flags = 33 >> 1;	left to right
7	< <= > >=	Comparison less-than Comparison less-than-or-equal-to Comparison greater-than Comparison geater-than-or-equal-to	if( i < 42 ) ... if( i <= 42 ) ... if( i > 42 ) ... if( i >= 42 ) ...	left to right
8	== !=	Comparison equal-to Comparison not-equal-to	if( i == 42 ) ... if( i != 42 ) ...	left to right
9	&	Bitwise AND	flags = flags & 42;	left to right
10	^	Bitwise exclusive OR	flags = flags ^ 42;	left to right
11	|	Bitwise inclusive (normal) OR	flags = flags | 42;	left to right
12	&&	Logical AND	if( conditionA && conditionB ) ...	left to right
13	||	Logical OR	if( conditionA || conditionB ) ...	left to right
14	? :	Ternary conditional (if-then-else)	int i = (a > b) ? a : b;	right to left
15	= += -= *= /= %= &= ^= |= <<= >>=	Assignment operator Increment and assign Decrement and assign Multiply and assign Divide and assign Modulo and assign Bitwise AND and assign Bitwise exclusive OR and assign Bitwise inclusive (normal) OR and assign Bitwise shift left and assign Bitwise shift right and assign	int a = b; a += 3; b -= 4; a *= 5; a /= 2; a %= 3; flags &= new_flags; flags ^= new_flags; flags |= new_flags; flags <<= 2; flags >>= 2;	right to left
16	,	Sequential uation operator	for( i = 0, j = 0; i < 10; i++, j++ ) ...	left to right