NOT

The NOT function is used to invert the Boolean value of an expression. It useful for explicitly testing for a false condition.

COMMAND SYNTAX

NOT(expression)

SYNTAX ELEMENTS

expression may evaluate to any Boolean result.

NOTES

The NOT function will return Boolean TRUE if the expression returned a Boolean FALSE. It will return Boolean FALSE of the expression returned a Boolean TRUE.

The NOT function is useful for explicitly testing for the false condition of some test and can clarify the logic of such a test.

EXAMPLES

EQU Sunday TO NOT(MOD(DATE(), 7))
IF Sunday THEN
    CRT "It is Sunday!"
END

In this example the expression MOD(DATE(),7) will return 0 (FALSE) if the day is Sunday and 1 to 6 (TRUE) for the other days. To explicitly test for the day Sunday we need to invert the result of the expression. BY using the NOT function we return a 1 (TRUE) if the day is Sunday and 0 (FALSE) for all other values of the expression.

jBC