Progress
Language Reference
NOT Operator
Returns TRUE if an expression is false, and FALSE if an expression is true.
SYNTAX
expression
A logical expression whose value is logical, that is TRUE/FALSE, YES/NO.
EXAMPLEIn this procedure, if the user enters the number of a customer that does not exist, the procedure displays a message that the customer does not exist and the user must try again. If the customer does exist, the procedure displays the name and phone number of the customer.
SEE ALSO
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