Operators

Arithmetic expressions can be built using the usual conventions:

• Operators + and - add and subtract numerical values

• Operators * and / multiply and divide numerical values

• Brackets (…) are used to group sub-expressions particularly to build nested expressions.

Boolean expressions can be built using the following conventions:

• Operators eq, ne, lt, le, gt, ge, test for equality, inequality, less than, less than or equals, greater than, greater than or equals, and apply to a pair of numerical expressions or a pair of alphanumeric expressions or a pair of Boolean expressions. (The result will be unpredictable if expressions of different type are compared.)

• Operators and and or test for Boolean "and" and Boolean "or" between two Boolean expressions.

• Operator not is used to negate the Boolean expression that follows it.