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 = http://www.mamicode.com/*ptr; address = &obj; int i = (int) floatNum; int size = sizeof(floatNum);
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 evaluation operator
for( i = 0, j = 0; i < 10; i++, j++ ) ...
left to right
C++优先级列表
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 = http://www.mamicode.com/*ptr; address = &obj; int i = (int) floatNum; int size = sizeof(floatNum);
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
int i = (a > b) ? a : b
left to right
14
? :
Ternary conditional (if-then-else)
if( conditionA || conditionB ) ...
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
