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Logical Operators (Delphi and Corel Paradox Cross Reference Guide)

By Mike Prestwood

Delphi versus Corel Paradox: A side by side comparison between Delphi and Corel Paradox.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Logical Operators

[Other Languages]

Languages Focus

Logical operators perform conditional and, or, and not operations. Some languages support both binary logical operators that link two and unary logical operators negate (make opposite) the truth value of its argument. Finally, some languages short circuit logic. For example, with this or that, if this is an expression returning true, then that is never executed.

Delphi:

Delphi logical operators:

and	and, as in this and that
or	or, as in this or that
not	Not, as in Not This
xor	either or, as in this or that but not both

The Delphi compiler default is to short circuit multi argument boolean expressions when the result is known before the evaluation completes. To disable short circuiting, use the {$B+} compiler directive. To reset it back to the compiler default of short circuting, use the {$B-} compiler directive.

Syntax Example:

//Given expressions a, b, c, and d:

if Not (a and b) and (c or d) then

  //Do something.

Delphi Logical Operators 1 certification question.

Corel Paradox:

ObjectPAL logical operators:

and	and, as in this and that
or	or, as in this or that
Not	Not, as in Not This

Like VBA, ObjectPAL never short circuits. Given the expression this or that as well as this and that, if this evaluates to false, then that is still executed.

Syntax Example:

;Given expressions a, b, c, and d:

if Not (a and b) and (c or d) then

  ;Do something.

endIf

ObjectPAL Logical Operators 1 certification question.