9.12 The logical negation operator

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The result of the logical negation operator (written ! and pronounced

'not', used in the comparison operations 'if/IF', 'for/FOR' and

'while/WHILE', is the logical negation of its operand. This means that if a

condition is TRUE, then !condition is FALSE and vice-versa.

Expressions

The expressions

IF ( NOTCARRYFLAG )... and IF (! CARRYFLAG )...

IF ( proc() == 0 )... and IF (! proc() )...

Could this be 'are equivalent'.