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++.
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()
[]
.
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Function Call
Referencing to an array element
Referencing to a structure element
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From left to right
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!
~
—
++
--
(type)
sizeof
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Logical negation
Bitwise negation (complement)
Sign changing
Increment by one
Decrement by one
Typecasting
Determining size in bytes
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Right to left
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*
/
%
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Multiplication
Division
Module division
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From left to right
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+
—
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Addition
Subtraction
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From left to right
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<<
>>
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Left shift
Right shift
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From left to right
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<
<=
>
>=
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Less than
Less than or equal
Greater than
Greater than or equal
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From left to right
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==
!=
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Equal
Not equal
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From left to right
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&
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Bitwise AND operation
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From left to right
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^
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Bitwise exclusive OR
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From left to right
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Bitwise OR operation
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From left to right
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&&
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Logical AND operation
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From left to right
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||
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Logical OR operation
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From left to right
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?:
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Conditional Operator
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Right to left
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=
*=
/=
%=
+=
-=
<<=
>>=
&=
^=
|=
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Assignment
Multiplication with assignment
Division with assignment
Module with assignment
Addition 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
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Right to left
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,
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Comma
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From left to right
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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.
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()
[]
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Function call
Referencing to an array element
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From left to right
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!
-
++
--
~
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Logical negation
Sign changing operation
Increment
Decrement
Bitwise negation (complement)
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From right to left
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&
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^
<<
>>
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Bitwise operation AND
Bitwise operation OR
Bitwise operation exclusive OR
Left shift
Right shift
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From left to right
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*
/
%
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Multiplication
Division
Module division
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From left to right
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+
-
|
Addition
Subtraction
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From left to right
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<
<=
>
>=
==
!=
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Less than
Less than or equal
Greater than
Greater than or equal
Equal
Not equal
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From left to right
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||
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Logical OR
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From left to right
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&&
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Logical AND
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From left to right
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=
+=
-=
*=
/=
%=
>>=
<<=
&=
|=
^=
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Assignment
Assignment addition
Assignment subtraction
Assignment multiplication
Assignment division
Assignment module
Assignment right shift
Assignment left shift
Assignment bitwise AND
Assignment bitwise OR
Assignment exclusive OR
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From right to left
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,
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Comma
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From left to right
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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.
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Language Basics 
