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Logical operators

Logical operators

The logical operators begin and end with a full stop. For example:

.OR.

.AND.

.NOT.

They operate on the logical values true and false as follows:

a .OR. b   is true if either a or b (or both) are true otherwise it is false.

a .AND. is true if both a and b are true otherwise it is false.

Do not assume that a is evaluated first.

.NOT. a   is true if a is false and vice-versa.

 

 

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