====== ST language operators ======

In the ST language, an expression consists of operators and operands. Operands are [[:en:mervis-ide:35-help:035-software_basic:030-common-elements:025-literals|literals]], [[:en:mervis-ide:35-help:035-software_basic:035-data-types:015-user_defined_data_types|enumeration types]], [[:en:mervis-ide:35-help:035-software_basic:030-common-elements:030-variables|variables]], [[:en:mervis-ide:35-help:035-software_basic:045-pou:005-function|function]] calls with values, [[:en:mervis-ide:35-help:035-software_basic:040-oop|method]] calls with values, or  [[:en:mervis-ide:35-help:035-software_basic:045-pou:015-fb|function block]] calls with values.

^Operator                               ^Description         ^Example ^Priority    ^
|()                                     |Parentheses         |(A+B)/C |11 (highest)|
|Evaluation of a function or of a method|Identifier          |LN(A)   |10          |
|%%^%%                                  |Dereference         |R%%^%%  |9           |
|-                                      |Negation            |-A      |8           |
|+                                      |Unary plus          |+B      |8           |
|NOT                                    |Negation            |NOT C   |8           |
|%%**%%                                 |Exponentiation      |A%%**%%B|7           |
|*                                      |Multiplication      |A*B     |6           |
|/                                      |Division            |A/B     |6           |
|MOD                                    |Modulo              |A MOD B |6           |
|+                                      |Adding              |A+B     |5           |
|-                                      |Subtracting         |A-B     |5           |
|< , > , <= , >=                        |Comparison          |A<B     |4           |
|=                                      |Equality            |A=B     |4           |
|<>                                     |Inequality          |A<>B    |4           |
|AND, &                                 |Logical AND         |A AND B |3           |
|XOR                                    |Logical exclusive OR|A XOR B |2           |
|OR                                     |Logical OR          |A OR B  |1           |