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 .not.               Logical NOT operator (unary)
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 Syntax
   .not. <expr>

 Arguments
   <expr> is a logical expression.

 Description
   The .not. operator performs a logical inversion on its operand.
   If <expr> has a value of .f., then .not. <expr> has a value of .t., and
   vice versa.

 Example
   #define EXAMPLE_OPERATOR
   #include example.hdr

   proc Test_914
   ? .not. .t.                // prints .F.
   ? .not. .f.                // prints .T.
   ? .not. 1 > 2              // prints .T.
   ? .not. 2 > 1              // prints .T.
   endproc

   proc main
   Test_914()
   endproc