Operator precedence memory formulas and lists

Source: Internet
Author: User

C-language operator precedence and formulas

There are 15 priority levels: operators of the same precedence, and the order of operations is determined by the binding direction

1 () []. --(parentheses, member row first)

2! ~-(minus) + +--& (take variable address) * (type) (mandatory) sizeof (single-mesh operation second)

3 */% (multiplication more)

4 +-(plus minus four)

5 >> << (Shift five)

6 > >= < <= (Relationship VI)

7 = = = (equals unequal row seventh)

8 & (Bit "and")

9 ^ ("XOR")

10 | (and Bit "or") three points to the world eighty or ninety

&& (logic "and")

12 | | (and "or") 11 and 12

13?: (conditional operator)

+ = = *=/=%= |= ^= &= >>= <<= (condition above assignment)

15, (comma priority lowest)

Binding: 2 13 14 is from right to left the other is from left to right there are problems can be in the communication

Bracket member first;  The parentheses operator [] () member operator. -

The whole monocular second; All monocular operators such as + +,--、 + (positive),-(negative), pointer operations *, &

Multiplication Yozo, plus minus four; This "remainder" refers to the residual operation that is%

Shift five, relationship six; Shift operators:<< >>, Relationships:> < >= <=, etc.

Equal to (and) unequal row seventh; that is = = and! =

Bits and Xor and bits or; These are bitwise operations: Bits and (&) XOR (^) bits or (|)

"Three points of the world" eighty or ninety;

logic or heel; Logical operators: | | and &&

12 and 11;  Note Order: Priority (| |) Bottom-to-priority (&&)

Conditions above assignment,//three mesh operator precedence to 13-bit only than assignment operator and "," high

Lowest comma operation level! The comma operator has the lowest precedence

Priority level

Operator

Name or meaning

Use form

Combination direction

Description

1

[]

Array subscript

array name [constant expression]

Left to right

()

Parentheses

(expression)/function name (formal parameter list)

.

Member selection (object)

Object. Member name

-

Member selection (pointer)

Object pointers, member names

2

-

Minus sign operator

-expression

Right to Left

Monocular operator

Type

Forcing type conversions

(data type) expression

++

Self-increment operator

+ + variable name/variable name + +

Monocular operator

--

Self-decrement operator

--Variable name/variable name--

Monocular operator

*

Value operator

* Pointer variable

Monocular operator

&

Fetch address operator

& Variable Name

Monocular operator

!

Logical non-operator

! An expression

Monocular operator

~

Bitwise inverse operator

~ Expression

Monocular operator

sizeof

Length operator

sizeof (expression)

3

/

Except

An expression/expression

Left to right

Binocular operator

*

By

Expression-expression *

Binocular operator

%

Remainder (modulo)

Integer expression/integer expression

Binocular operator

4

+

Add

An expression + an expression

Left to right

Binocular operator

-

Reducing

Expression-expression

Binocular operator

5

<<

Move left

Variables << expressions

Left to right

Binocular operator

>>

Move right

Variables >> expressions

Binocular operator

6

>

Greater than

Expressions > expressions

Left to right

Binocular operator

>=

Greater than or equal

Expression->= expression

Binocular operator

<

Less than

Expressions < expressions

Binocular operator

<=

Less than or equal

Expression-<= expression

Binocular operator

7

==

Equals

Expression-= = Expression

Left to right

Binocular operator

!=

Not equal to

Expression! = Expression

Binocular operator

8

&

Bitwise-AND

Expressions & Expressions

Left to right

Binocular operator

9

^

Bitwise XOR OR

An expression ^ expression

Left to right

Binocular operator

10

|

Bitwise OR

Expression-expression

Left to right

Binocular operator

11

&&

Logic and

Expressions && Expressions

Left to right

Binocular operator

12

||

Logical OR

An expression | | An expression

Left to right

Binocular operator

13

?:

Conditional operators

Expression 1? Expression 2: Expression 3

Right to Left

Trinocular operator

14

=

Assignment operators

variable = expression

Right to Left

/=

Assign value after addition

Variable-/= expression

*=

Multiply post-Assign value

Variable-*= expression

%=

Assign value after modulo

Variable-%= expression

+=

Add after Assignment

Variable + = expression

-=

Reduced-value Assignment

Variable-= expression

<<=

Assign value after left shift

Variable-<<= expression

>>=

Assign value after right shift

Variable->>= expression

&=

Bitwise AND post-assigned values

Variable-&= expression

^=

Bitwise XOR or post-assignment

Variable-^= expression

|=

Bitwise OR post-assigned value

Variable-|= expression

15

,

Comma operator

expression, expression,...

Left to right

Left-to-right sequential operation

Description

Operators of the same precedence, the order of operations is determined by the binding direction.

Logic Operators && | | "Lazy Evaluation"

Simple Note is:! > Arithmetic operators > Relational operators > && > | | > Assignment Operators

Http://www.cnblogs.com/PegasusWang/articles/2874975.html

Operator precedence memory formulas and lists (goto)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.