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What is the operator precedence rule in C language?

清浅
清浅Original
2019-03-19 13:16:2462773browse

C language operator priority order is: bracket members first; all single items second; multiplication and division remainder three, addition and subtraction four; shift five, relationship six; equality (and) inequality ranking Seven; bitwise AND, XOR and bitwise OR, "three-thirds of the world" eighty or ninety; logical OR and AND, twelve and eleven; condition is higher than assignment; comma operation level is the lowest.

What is the operator precedence rule in C language?

There are fifteen priorities in total:

## 2(Type)--##exceptexpression/expressionleft to rightBinary operator*Multiplyexpression*expressionbinary operator%Remainder (modulo)Integer expression/integer expressionBinary operation Symbol4plusExpression expressionLeft to right##> is greater than Expression>ExpressionLeft to right##less thanexpression

binary operator
<=less than or equal toExpression< ;=expressionbinary operator##7!=##&&Logic andExpression&&expressionLeft to rightBinary operator12||##1314##Assignment after bitwise ANDVariable&=Expression^=Assignment after bitwise XORVariable^=expression|=##15

Priority

Operator

Name or meaning

Used form

Combined direction

Description

1

[]

Array subscript

Array name [constant expression]

Left to right

()

Parentheses

## (expression)/function name (parameter list)

.

Member Select(object)

Object.Member name

##->

Member selection (pointer)

Object pointer->Member name

##-

Negative operator

-expression

Right to left

Unary operator

Forced type conversion

(data type) expression

Increment operator

Variable name/variable name

Single Operator

Decrement operator

--Variable name/Variable name--

Unary operator

*

Value operator

*Pointer variable

Unary operator

&

Get address operator

& variable name

Unary operator

!

Logical NOT operation Symbol

!Expression

Unary operator

~

Bitwise negation operator

~Expression

Unary operator

sizeof

length operator

sizeof(expression)

##3

/

Binary Operator

-

Minus

Expression-expression

Binary operator

5

<<

Shift left

Variable<

Left to right

Binary operator

##>>

Shift right

Variable>>Expression

Binary operator

6

Binary Operator

>=

Greater than or equal to

expression>=expression

binary operator

# #<

==

equal to

expression==expression

left to right

Binary operator

is not equal to

expression!= expression

binary operator

8

&

## bitwise and

Expression&expression

Left to right

Binary operator

9

^

Bitwise XOR

Expression^Expression

Left to right

Binary operator

10

|

bitwise OR

expression|expression

Left to right

Binary operator

##11

##Logical or

Expression||Expression

Left to right

Binary operator

?:

Conditional operator

Expression 1 ? Expression 2: Expression 3

right to left

ternary operator

=

Assignment operator

Variable = expression

right to left

/=

Assignment after division

Variable/=Expression

*=

Multiply and assign value

Variable*=expression

%=

Assign a value after taking the modulus

Variable% =Expression

=

Assignment after addition

Variable = expression

-=

Assignment after subtraction

Variable-=Expression

<<=

Assign value after left shift

Variable<<=expression

#>>=

Assign value after right shift

Variable>>=expression

&=

##Assignment after bitwise OR

Variable|=Expression

,

Comma operator

Expression, expression,...

Left to right

Operations sequentially from left to right

##Instructions:

For operators with the same priority, the order of operations is determined by the combination direction.

Function:

    ##Bracket members no. 1; //Bracket operator []() Member operator. ->
  • All unary operators Second; //All unary operators such as, --, ( Positive), -(negative), pointer arithmetic*, &
  • multiplication and division with remainder three, addition and subtraction four; //This "remainder" refers to the remainder operation, that is, %
  • Shift five, relationship six; //Shift operator: << >>, relationship: > < >= <= etc.
  • Equal (and) is not equal to the seventh; //that is, == and!=
  • bitwise AND, XOR and bitwise OR; //These are all It is a bitwise operation: Bitwise AND (&) XOR (^) Bitwise OR (|)
  • "三三天下"八九十;

  • Logical OR and AND ; ;
  • The condition is higher than the assignment, //The ternary operator's priority is ranked 13th, only higher than the assignment operator and ","

    The comma operation level is the lowest! //Comma Operator has the lowest precedence
  • #

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