IT SOLUTIONS
Your full service technology partner! 
-Collapse +Expand
Prism
Search Prism Group:

Advanced
-Collapse +Expand Prism To/From
To/FromCODEGuides
-Collapse +Expand Prism Study Test
PRESTWOODCERTIFIED
-Collapse +Expand Prism Store
PRESTWOODSTORE

Prestwood eMagazine

October Edition
Subscribe now! It's Free!
Enter your email:

   ► KBProgrammingDelphi PrismLanguage Basics   Print This     
  From the August 2009 Issue of Prestwood eMag
 
Prism Language Basics:
Delphi Prism Literals (quote or apostrophe)
 
Posted 13 years ago on 12/14/2008 and updated 1/18/2009
Prism Code Snippet:
 A flashcard from our Prism Flashcards Library
 A code snippet from our Prism Code Snippets Page

KB101701

General Info: Programming Literals

A value directly written into the source code of a computer program (as opposed to an identifier like a variable or constant). Literals cannot be changed. Common types of literals include string literals, floating point literals, integer literals, and hexidemal literals. Literal strings are usually either quoted (") or use an apostrophe (') which is often referred to as a single quote. Sometimes quotes are inaccurately referred to as double quotes.

Languages Focus: Literals

In addition to understanding whether to use a quote or apostrophe for string literals, you also want to know how to specify and work with other types of literals including floating point literals. Some compilers allow leading and trailing decimals (.1 + .1), while some require a leading or trailing 0 as in (0.1 + 0.1). Also, because floating point literals are difficult for compilers to represent accurately, you need to understand how the compiler handles them and how to use rounding and trimming commands correctly for the nature of the project your are coding.

Delphi Prism Literals

In Prism, you use either quotes or apostrophes for string literals.

Different than Delphi, you can start floating point literals with a decimal or an integer. For example, to specify a fractional floating point literal between 1 and -1, you can preceed the decimal with a 0 or not.

x := .1 + .1;     //Does work.
x := 0.1 + 0.1;   //Does work.
Syntax Example:
MessageBox.Show('Hello');
MessageBox.Show("Hello");

//Example of embedding quotes and apostropes:
MessageBox.Show('He said, "Who''s computer?"');
MessageBox.Show("She said, ""Mike's computer"".");

More Info

Definition:  Programming Literals

Comments

0 Comments.
Share a thought or comment...
 
Write a Comment...
...
Sign in...

If you are a member, Sign In. Or, you can Create a Free account now.


Anonymous Post (text-only, no HTML):

Enter your name and security key.

Your Name:
Security key = P1156A1
Enter key:
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.

Visit Profile


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?

In Prism, you can use either apostrphes or quotes for string literals and you can embed an apostrophe and quote in either as follows:

MessageBox.Show('He said, "Who''s computer?"');
MessageBox.Show("She said, ""Mike's"".");
Answer:
  • True
  • False

  •  KB Article #101701 Counter
    9395
    Since 12/14/2008
    Go ahead!   Use Us! Call: 916-726-5675  Or visit our new sales site: 
    www.prestwood.com


    ©1995-2021 Prestwood IT Solutions.   [Security & Privacy]