NOT operator

NOT operator

Returns TRUE if an expression is false, and FALSE if an expression is true.

Syntax
NOT expression 
expression

A logical expression whose value is logical, that is TRUE/FALSE, YES/NO.

Example

In 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.
r-not.p
REPEAT: 
  PROMPT-FOR Customer.CustNum. 
  FIND Customer USING Customer.CustNum NO-ERROR. 
  IF NOT AVAILABLE customer THEN DO: 
    MESSAGE "Customer with CustNum:" INPUT Customer.CustNum 
      " does not exist. Please try another.". 
    UNDO, RETRY. 
  END. 
  ELSE  
    DISPLAY Customer.Name Customer.Phone. 
END. 
See also

AND operator, OR operator

NOT `expression`

r-not.p
REPEAT: PROMPT-FOR Customer.CustNum. FIND Customer USING Customer.CustNum NO-ERROR. IF NOT AVAILABLE customer THEN DO: MESSAGE "Customer with CustNum:" INPUT Customer.CustNum " does not exist. Please try another.". UNDO, RETRY. END. ELSE DISPLAY Customer.Name Customer.Phone. END.

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