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# Precedence Rules

Each group of operations in the table has the same priority. The higher the priority of operations is, the higher it is position of the group in the table. The precedence rules determine the grouping of operations and operands.

Attention: Precedence of operations in the MQL4 language corresponds to the priority adopted in C++.

Operation

Desciption

Execution Order

()

[]

.

Function Call

Referencing to an array element

Referencing to a structure element

From left to right

!

~

-

++

--

(type)

sizeof

Logical negation

Bitwise negation (complement)

Sign changing

Increment by one

Decrement by one

Typecasting

Determining size in bytes

Right to left

*

/

%

Multiplication

Division

Module division

From left to right

+

-

Subtraction

From left to right

<<

>>

Left shift

Right shift

From left to right

<

<=

>

>=

Less than

Less than or equal

Greater than

Greater than or equal

From left to right

==

!=

Equal

Not equal

From left to right

&

Bitwise AND operation

From left to right

^

Bitwise exclusive OR

From left to right

|

Bitwise OR operation

From left to right

&&

Logical AND operation

From left to right

||

Logical OR operation

From left to right

?:

Conditional Operator

Right to left

=

*=

/=

%=

+=

-=

<<=

>>=

&=

^=

|=

Assignment

Multiplication with assignment

Division with assignment

Module with assignment

Subtraction with assignment

Left shift with assignment

Right shift with assignment

Bitwise AND with assignment

Exclusive OR with assignment

Bitwise OR with assignment

Right to left

,

Comma

From left to right

To change the operation execution order, parenthesis that are of higher priority are used.

# Precedence Rules for the old version of MQL4

The precedence rules for the old version of MQL4 language are presented below.

Each group of operations in the table has the same priority. The higher is the priority, the higher is the position of the group in the table. The precedence rules determine the grouping of operations and operands.

Operation

Description

Execution Order

()

[]

Function call

Referencing to an array element

From left to right

!

-

++

--

~

Logical negation

Sign changing operation

Increment

Decrement

Bitwise negation (complement)

From right to left

&

|

^

<<

>>

Bitwise operation AND

Bitwise operation OR

Bitwise operation exclusive OR

Left shift

Right shift

From left to right

*

/

%

Multiplication

Division

Module division

From left to right

+

-

Subtraction

From left to right

<

<=

>

>=

==

!=

Less than

Less than or equal

Greater than

Greater than or equal

Equal

Not equal

From left to right

||

Logical OR

From left to right

&&

Logical AND

From left to right

=

+=

-=

*=

/=

%=

>>=

<<=

&=

|=

^=

Assignment

Assignment subtraction

Assignment multiplication

Assignment division

Assignment module

Assignment right shift

Assignment left shift

Assignment bitwise AND

Assignment bitwise OR

Assignment exclusive OR

From right to left

,

Comma

From left to right

Parentheses that have higher priority are applied to change the execution order of the operations.

Attention: Priority of performing operations in old MQL4 differs to some extent from that conventional in the C language. 其他运算操作符 