Boolean Is Equal or Less '=<', '=<='

The Boolean operator Is Equal or Less compares two operands and returns TRUE (-1) if the first value is equal to or less than the second value, or returns FALSE (0), otherwise. Is Equal or Less 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 equal to or less than the value of Z, or FALSE (0) if Y is greater than the value of Z.

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

IF (Y =< 75)

Here, the Is Equal or Less operator returns TRUE if Y is equal to or less than 75.

Is Equal or Less 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 X is equal to or less than Y, X is set to TRUE (-1), otherwise X is set to FALSE (0). The assignment form of Is Equal or Less may also be used within expressions for intermediate results; see Intermediate Assignments.