Or: Difference between revisions

Revision as of 10:24, 19 February 2012

A logical (Boolean) operator that returns True if one or both of its operands are true. Logical operators are used in logical (Boolean) expressions that operate with true/false values.

Usage

E1 Or E2

Where:

E - true/false expressions.

Notes

If one of the true/false expressions evaluates to True, the whole expression is evaluated as true due to the or logical operator. For example:

(10 > 1) or (10 > 20)

Will evaluate to True since the first expression is true, even though the second expression (10 > 20) is false.

The whole expression is evaluated as true if one of the individual expressions evaluates to true. For example:

(10 > 100) or (100 < 2000) or (21 = 1)

Will evaluate to True since the second expression (100 < 2000) is indeed true.

See And for logical and true/false expressions.

Examples

2 = 1 Or 2 > 2

Will return a value of False.

True Or False Or False

Will return a value of True.

@@ Line 1: / Line 1: @@
 A logical (Boolean) operator that returns [[True]] if one or both of its operands are true. Logical operators are used in logical (Boolean) expressions that operate with true/false values.
-==== Usage ====
+== Usage ==
 <syntaxhighlight>E1 Or E2</syntaxhighlight>
-Where: [[E]] - true/false expressions
+Where:
-==== Example ====
+:'''E''' - true/false expressions.
-<syntaxhighlight>2=1 Or 2>2   will return a value of False
-True Or False Or False   will return a value of True </syntaxhighlight>
+== Notes ==
+* If one of the true/false expressions evaluates to [[True]], the whole expression is evaluated as true due to the '''or''' logical operator. For example:
+:<syntaxhighlight>(10 > 1) or (10 > 20)</syntaxhighlight>
+:Will evaluate to [[True]] since the first expression is true, even though the second expression (10 > 20) is false.
+* The whole expression is evaluated as true if '''one''' of the individual expressions evaluates to true. For example:
+:<syntaxhighlight>(10 > 100) or (100 < 2000) or (21 = 1)</syntaxhighlight>
+:Will evaluate to [[True]] since the second expression (100 < 2000) is indeed true.
+* See [[And]] for logical '''and''' true/false expressions.
+== Examples ==
+<syntaxhighlight>2 = 1 Or 2 > 2</syntaxhighlight>
+Will return a value of [[False]].
+<syntaxhighlight>
+True Or False Or False</syntaxhighlight>
+Will return a value of True.
 [[Category:Comparisons and Loops]]