您的位置：首页 > 编程语言 > C语言/C++

C++ Operator Precedence

2008-07-30 10:47 375 查看

C++ Operator Precedence

The operators at the top of this list are evaluated first.

PrecedenceOperatorDescriptionExampleAssociativity
1::

Scoping operator

Class::age = 2;

none
2()

[]

->

.

++

--		Grouping operator

Array access

Member access from a pointer

Member access from an object

Post-increment

Post-decrement		(a + b) / 4;

array[4] = 2;

ptr->age = 34;

obj.age = 34;

for( i = 0; i < 10; i++ ) ...

for( i = 10; i > 0; i-- ) ...		left to right
3!

~

++

--

-

+

*

&

(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
4->*

.*		Member pointer selector

Member object selector		ptr->*var = 24;

obj.*var = 24;		left to right
5*

/

%		Multiplication

Division

Modulus		int i = 2 * 4;

float f = 10 / 3;

int rem = 4 % 3;		left to right
6+

-		Addition

Subtraction		int i = 2 + 3;

int i = 5 - 1;		left to right
7<<

>>		Bitwise shift left

Bitwise shift right		int flags = 33 << 1;

int flags = 33 >> 1;		left to right
8<

<=

>

>=		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
9==

!=		Comparison equal-to

Comparison not-equal-to		if( i == 42 ) ...

if( i != 42 ) ...		left to right
10&Bitwise ANDflags = flags & 42;left to right
11^Bitwise exclusive ORflags = flags ^ 42;left to right
12|Bitwise inclusive (normal) ORflags = flags | 42;left to right
13&&Logical ANDif( conditionA && conditionB ) ...left to right
14||Logical ORif( conditionA || conditionB ) ...left to right
15? :Ternary conditional (if-then-else)int i = (a > b) ? a : b;right to left
16=

+=

-=

*=

/=

%=

&=

^=

|=

<<=

>>=		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
17,Sequential evaluation operatorfor( i = 0, j = 0; i < 10; i++, j++ ) ...left to right
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签： 
相关文章推荐
新的分享
章节导航