Operators and expressions

The arithmetic operators are:

Table 1. Arithmetic operators
Operator	Operation
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulo

In an arithmetic expression the terms are evaluated left to right. The order of precedence of the operators is: *, /, %, +, -. For example, the result of :

4 * 2 + 16 / 8 - 1 * 2

is 8. You can use parentheses to indicate the order in which you want expressions to be evaluated:

(4 * 2) + (16 / 8) - (1 * 2)    evaluates to 8
but
4 * (( 2 + 16) / (8 - 1)) * 2   evaluates to 20.571