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Logical Operators (Corel Paradox and Java Cross Reference Guide)

By Mike Prestwood

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

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.

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.

Java:

Java logical operators:

&&	and, as in this and that
\|\|	or, as in this or that
!	Not, as in Not This
&	boolean logical OR (not short circuited)
\|	boolean logical OR (not short circuited)
?:	Ternary (short for if-then-else)
~	Unary bitwise complement
<<	Signed left shift
>>	Signed right shift
>>>	Unsigned right shift
^	Bitwise exclusiv OR

Syntax Example:

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

if !((a && b) && (c || d)) {

  //Do something.