Boolean Is Not Equal '<>', '<>='

The Boolean operator Is Not Equal compares two operands and returns True (-1) if the values are not the same, or returns FALSE (0), otherwise. Is Not Equal can be used in both variable and constant expressions. Example:

X := Y <> Z

The above example compares the value of Y with the value of Z and sets X to either: TRUE (-1) if Y is not the same value as Z, or FALSE (0) if Y is the same value as Z.

This operator is often used in conditional expressions, such as in the following example.

IF (Y <> 25)

Here, the Is Not Equal operator returns TRUE if Y is not 25.

Is Not Equal has an assignment form, <>=, that uses the variable to its left as both the first operand and the result destination. For example,

X <>= Y     'Short form of X := X <> Y

Here, X is compared with Y, and if they are not equal, X is set to TRUE (-1), otherwise X is set to FALSE (0). The assignment form of Is Not Equal may also be used within expressions for intermediate results; see Intermediate Assignments.