Operators; Changing And Comparing Values; Arithmetic Operators; Relational Operators - AMX AXCESS CONTROL SYSTEM PROGRAM Instruction Manual

Operators

Changing and Comparing Values

In your Axcess program, you may need to increase the value of a variable, to see if that variable has
reached a certain value, or to compare different values to each other. The tools that you use to
perform these tasks are called operators. There are four types of operators in Axcess: arithmetic,
relational, logical, and bitwise.

Arithmetic Operators

Arithmetic operators create a numeric value from one or more operations, such as addition,
multiplication, and division. They are listed in the table below.
Arithmetic Operators
Symbol Function Symbol Function
+
-
*
Here is an example of arithmetic operators in an Axcess program:
X = 7 + 5
Y = X * 3
In the example above, X = 12 and Y = 36. There is an order of precedence for arithmetic operators;
that is, some operations are performed first and others second. For example, multiplication
operations (*) are performed before addition operations (+).
Here is an example that illustrates this precedence:
X = 7 + 5 * 3
Reading this expression left to right, X = 36. However, since multiplication takes precedence,
X = 22 (5 * 3 = 15, and 7 + 15 = 22). For detailed information on precedence, refer to
the Precedence Among Operators section on page 51.

Relational Operators

Relational operators, compare two numeric values and produces a true or false result. These
operators are listed below.
Relational Operators
Symbol Function
<
>
=
Here is an example of these operators in practice:
Axcess Programming Language
Add / Divide
Subtract % Modulus
Multiply
Symbol Function
Less than <= Less than or equal to
Greater than >= Greater than or equal to
Equal to <> Not equal to
Operators
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