C language operator Priority Level

C language operator Priority Level

C language operator Priority Level

[Square brackets and arrows end with a full stop]
[Auto-incrementing auto-minus non-negative, needle strong address length]
[Multiplication, division, addition, subtraction, and shift again]
[Small, big, and so on]
[Octal and], [Seven differences], [six or], [five and], [four or], [three questions], [two assignments], [funny]

("[]" Indicates a level segment)

Note:

"Square brackets and arrows end with a full stop"
It refers to a 15th-level operator. The [square brackets] are "(), []", the [Arrow] refers to the "->" operator pointing to the struct member, and the [period] refers to the struct member operator ". ";

"Auto-incrementing auto-minus non-negative, needle strong address length"
It refers to a 14th-level operator. [Not] indicates the logical operator "!". [Inverse] refers to the bitwise inverse operator "~", [Negative] refers to the negative operator "-", [Needle] refers to the pointer operator "*", and [strong] refers to the forced type conversion operator, [address] refers to the address operator "&", and [length] refers to the length operator "sizeof ";

"Multiplication, division, addition, subtraction, and shift"
[Shift] refers to the Left shift operator "<" and right shift operator ">". The [addition] also includes the remainder operator "% ";

"Small, big, and so on"
[Small and so on] refers to operators ranging from 10th to 9th: <, <=,> and> =, [and so on] refers to operators equal to "= ", not equal to the operator "! = ";

"Eight and, seven are different, six or"
The "octal and" operator refers to the bitwise AND operator "&" of the 8th level, and the "Seven-bit" operator refers to the bitwise OR operator "^" of the 7th level ", the "six-digit" or "" operator is a 6th-level bitwise OR operator "| ";

"V and, 4 or"
[V.] refers to the 5th-Level Logic and operator "&", and [4 or] 4th-Level Logic or operator "| ";

"Three questions, two questions, one funny"
It refers to operators ranging from 3rd to 1st. Where [three doubts] refer to the condition operator "? : "(Three has a double meaning: that is, the priority is three, and its operator type is also three, the suspect is also"?" Meaning ), [binary Assignment] refers to the value assignment operators =, + =,-=, * =,/=, % =, >>=, <<=, & =, ^ =, and | =, [really funny] refers to the 1st-level "," operator. The real word is only required for statements.

Since the operator priority of C language is not exactly the same as that of C ++ (mainly adding several operators), this phrase cannot be fully used in C ++. but it should be compatible. You can compare their differences and quickly grasp the priority of C ++!

===== Operator priority and combination Law (sorted from high to low) ====

Operator ...................................................... Combination Law

() []-> ................................................. From left to right

! ~ + + -- (Type) sizeof + -*&............ From right to left

*/% ...................................................... From left to right

+ -......................................................... From left to right

<> ................................................... From left to right

<=> = .......................................... From left to right

=! ................................................... From left to right

&............................................................ From left to right

^ ............................................................ From left to right

| ............................................................ From left to right

&&......................................................... From left to right

| ............................................................ From right to left

? :............................................................ From right to left

= + =-= * =/= % = <=> =... From left to right

Priority
Operator name or meaning description
1
[] Array subscript array name [constant expression] left to right
() Parentheses (expressions)/function names (parameter tables)
. Select (object) object for the member. member name
-> Member selection (pointer) object pointer-> member name

2
-Negative sign operator-right-to-left single object operator of the expression
(Type) Forced type conversion (data type) Expression
++ Auto-increment operator ++ variable name/variable name ++ single object Operator
-- Auto-subtraction operator -- variable name/variable name -- single object Operator
* Value operator * single object operator of pointer variable
& Bitwise operators & variable names single-object Operators
! Logical non-Operator! Single Object Operator
~ Bitwise inversion operator ~ Single Object Operator
Sizeof length operator sizeof (expression)

3
/Except expressions/expressions left-to-right binary Operators
* Multiplication expression * expression left-to-right binocular Operator
% Remainder (Modulo) integer expression/Integer expression binary operator

4
+ Add expression + expression left-right binocular Operator
-Subtraction expression-expression binary operator

5
<Left shift variable <expression left-to-right binary operator
> Shift right variable> expression binary operator

6
> Greater than expression> left-right binary operator
> = Expression greater than or equal to> = expression binocular Operator
<Less than expression <expression binary operator
<= Less than or equal to expression <= expression binary operator

7
= Equal to expression = expression left-to-right binary operator

! = Not equal to the expression! = Expression binary operator

8
& Bitwise and expression & Expression left-to-right binary operator

9
^ Bitwise OR expression ^ left-right binary operator

10
| Bitwise OR expression | left-right binary operator of the expression

11
& Logic and Expression & Expression left-to-right binary operator

12
| Logic or expression | left-to-right binary operator of the expression

13
? : Conditional operator expression 1? Expression 2: expression 3 right-to-left Operator

14
= Value assignment operator variable = expression right to left

/= Assign variable/= expression after Division

* = Assign variable after multiplication * = expression

% = Value variable % = expression after modulo operation

+ = Add and assign variable + = expression

-= Assign a variable after subtraction-= expression

<= Assign variable after left shift <= expression

>>= Variable assigned after right shift >>= expression

& = Bitwise AND postvalue variable & = expression

^ = Bitwise OR post-assigned variable ^ = expression

| = Bitwise OR post-value variable | = expression

15
, Comma operator expression, expression ,... Left-to-right sequence operation

Note:

Operators with the same priority are determined by the Union direction.