Data types and Operators

Operator .NOT. Foundation

.NOT. operator (unary): logical negation.

Syntax 
.NOT. <lCondition>
! <lCondition>
Parameters
<lCondition>
<lCondition> is a logical expression whose value is to be negated.
Description

The .NOT. operator returns the negation of a logical value (the logical inversion of <lCondition>) as a result. The abbreviated form ! can also be used.

Examples
The .NOT. operator 
// This example demonstrates use and results of the 
// .NOT. operator (the abbreviation for .NOT. is !) 

PROCEDURE Main 

   ? .NOT. (.T.)                    // result: .F. 
   ? ! (.F.)                        // result: .T. 

   IF ! File("CUSTOMER.DBF") 
      ? " 'CUSTOMER.DBF' file does not exist" 
   ENDIF 

RETURN
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