Returns the logical complement of an expression.
||An expression that resolves to a boolean value.
function returns the logical complement (inverse) of a boolean expression. Thus all expressions that evaluate to 0 become 1, and all expressions that evaluate to 1 (or any non-zero numeric value) become 0. A string is parsed as a number until a non-numeric character is encountered. Thus 7dwarves is parsed as 7 (boolean 1), and thus NOT
returns 0. If expression
is the null string or a non-numeric value, NOT
parses it as boolean 0, and thus returns 1.
You can use the ANDS
functions to perform logical comparisons on two values (either single expressions or arrays).
The following example uses the NOT
function to return the inverse of a boolean expression:
PRINT NOT(1); ! Returns 0
PRINT NOT(0); ! Returns 1
PRINT NOT(7); ! Returns 0
PRINT NOT(-7); ! Returns 0
PRINT NOT("7dwarves"); ! Returns 0
PRINT NOT("fred"); ! Returns 1
PRINT NOT(""); ! Returns 1