Prestwood IT: Delphi Prism Logical Operators (Delphi Prism)

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► KB ► Programming ► Delphi Prism ► Language Basics

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From the December 2014 Issue of Prestwood eMag

Prism Language Basics:

Delphi Prism Logical Operators

By Mike Prestwood

Posted 16 years ago on 2/17/2009

Prism Code Snippet:

To/From Code Guide: Delphi Prism Logical... vs. Other Languages

A flashcard from our Prism Flashcards Library

A code snippet from our Prism Code Snippets Page

Tags: Delphi Prism , Logical Operators

KB101920

Languages Focus: Logical Operators

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 Prism Logical Operators

Prism 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

Syntax Example:

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

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

  //Do something.

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Beginner

1 Beginner Level Question

Question #1: True or False?

Given the following code, which MessageBox.Show will display? The True or the False one?

var a, b, c, d: Boolean;

a := False;
b := False; 
c := True; 
d := False;
  
if Not (a and b) and (c or d) then 
  MessageBox.Show('True') 
else 
  MessageBox.Show('False');

Answer:

True

False

KB Article #101920 Counter

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Since 2/17/2009