Operators
Operators take one or two values (or variables), perform an operation, and return a value. Let's check out a simple example of using an operator, just to clarify the terminology:
> 1 + 2; 3
In the preceding code:
 The
+
symbol is the operator  The operation is addition
 The input values are
1
and2
(they are also called operands)  The result value is
3
 The whole thing is called an expression
Instead of using the values 1
and 2
directly in the expression, you can use variables. You can also use a variable to store the result of the operation as the following example demonstrates:
> var a = 1; > var b = 2; > a + 1; 2 > b + 2; 4 > a + b; 3 > var c = a + b; > c; 3
The following table lists the basic arithmetic operators:
Operator symbol 
Operation 
Example 

Addition 
> 1 + 2; 3


Subtraction 
> 99.99  11; 88.99


Multiplication 
> 2 * 3; 6

