﻿ Precedence Rules - Operations and Expressions - Language Basics - MQL4 Reference
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MQL4 Reference Language Basics Operations and Expressions Precedence Rules

# 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 + — Addition 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 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 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 + - Addition 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 addition 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. Other OperationsOperators 