5 Operators and Functions
The term operand can refer to a number, a string, or a variable.
An operator is generally placed between two operands, but some operators can precede a single operand. For instance, the minus sign is an operator which indicates subtraction when it appears between two operands (for example, 512-88), but it indicates negation when it appears before a single operand (for example, -1).
Some examples of expressions are as follows:
A - B X + 1 "AB"&"CD" -1 +2.14 2.14* N* N$** "STRING"*** These are expressions in which the operator is assumed to be a plus sign (+).
** Strings or string variables can also be considered expressions.
Operators are divided into four classes depending on the kind of operation performed--arithmetic, string, relational, and logical (Boolean).