C++ 优先级表

The operators at the top of this list are evaluated first. Operators within a group have the same precedence. All operators have left-to-right associativity unless otherwise noted.

Operator	Description	Example
Group 1 (no associativity)
::	Scope resolution operator	Class::age = 2;
Group 2
()	Function call	isdigit('1')
[]	Array access	array[4] = 2;
->	Member access from a pointer	ptr->age = 34;
.	Member access from an object	obj.age = 34;
++	Post-increment	for( int i = 0; i < 10; i++ ) cout << i;
--	Post-decrement	for( int i = 10; i > 0; i-- ) cout << i;
Group 3 (right-to-left associativity)
!	Logical negation	if( !done ) …
~	Bitwise complement	flags = ~flags;
++	Pre-increment	for( i = 0; i < 10; ++i ) cout << i;
--	Pre-decrement	for( i = 10; i > 0; --i ) cout << i;
-	Unary minus	int i = -1;
+	Unary plus	int i = +1;
*	Dereference	int data = *intPtr;
&	Address of	int *intPtr = &data;
(type)	Cast to a given type	int i = (int) floatNum;
sizeof	Return size of an object	int size = sizeof(floatNum);
Group 4
->*	Member pointer selector	ptr->*var = 24;
.*	Member object selector	obj.*var = 24;
Group 5
*	Multiplication	int i = 2 * 4;
/	Division	float f = 10.0 / 3.0;
%	Modulus	int rem = 4 % 3;
Group 6
+	Addition	int i = 2 + 3;
-	Subtraction	int i = 5 - 1;
Group 7
<<	Bitwise shift left	int flags = 33 << 1;
>>	Bitwise shift right	int flags = 33 >> 1;
Group 8
<	Comparison less-than	if( i < 42 ) …
<=	Comparison less-than-or-equal-to	if( i <= 42 ) ...
>	Comparison greater-than	if( i > 42 ) …
>=	Comparison geater-than-or-equal-to	if( i >= 42 ) ...
Group 9
==	Comparison equal-to	if( i == 42 ) ...
!=	Comparison not-equal-to	if( i != 42 ) …
Group 10
&	Bitwise AND	flags = flags & 42;
Group 11
^	Bitwise exclusive OR (XOR)	flags = flags ^ 42;
Group 12
|	Bitwise inclusive (normal) OR	flags = flags | 42;
Group 13
&&	Logical AND	if( conditionA && conditionB ) …
Group 14
||	Logical OR	if( conditionA || conditionB ) ...
Group 15 (right-to-left associativity)
? :	Ternary conditional (if-then-else)	int i = (a > b) ? a : b;
Group 16 (right-to-left associativity)
=	Assignment operator	int a = b;
+=	Increment and assign	a += 3;
-=	Decrement and assign	b -= 4;
*=	Multiply and assign	a *= 5;
/=	Divide and assign	a /= 2;
%=	Modulo and assign	a %= 3;
&=	Bitwise AND and assign	flags &= new_flags;
^=	Bitwise exclusive or (XOR) and assign	flags ^= new_flags;
|=	Bitwise normal OR and assign	flags |= new_flags;
<<=	Bitwise shift left and assign	flags <<= 2;
>>=	Bitwise shift right and assign	flags >>= 2;
Group 17
,	Sequential evaluation operator	for( i = 0, j = 0; i < 10; i++, j++ ) …