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   ► KBProgrammingDelphi Prism   Print This     
  From the September 2009 Issue of Prestwood eMag
 
Delphi Prism Constants (const kPI: Double=3.1459;)
 
Posted 12 years ago on 12/18/2008 and updated 1/24/2009
Prism Code Snippet:
 A flashcard from our Prism Flashcards Library
 A code snippet from our Prism Code Snippets Page

KB101727

General Info: Computer Language Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

Delphi Prism Constants

In Prism, you define constants similar to how you define variables but use the Const keyword instead of the Var keyword. Specifying the type is optional. If you don't specify the type, the compiler chooses the most appropriate type for you.

Declare class constants as part of the class definitions. Declare local constants above the begin..end. Although Prism support inline variables, inline constants are not supported.

Syntax Example:
//Specified type:
const
kFeetToMeter: Double = 3.2808;
  kMeterToFeet: Double = .3048; 
  kName: String = "Mike";

//Unspecified type:
const kPIShort = 3.14;

About Computer Language Constants
A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

More Info

Definition:  Computer Language Constants

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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: Multiple Choice

Which code fragment uses the correct syntax to declare a constant?

Answer:
1. 

const

  kPI Double = 3.1459;

2. 

const

  kPI : Double := 3.1459;

3. 

const

  kPI As Double = 3.1459;

4. 

const

  kPI As Double := 3.1459;

5. 

const

  kPI : Double = 3.1459;


 KB Article #101727 Counter
9578
Since 12/18/2008


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