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   ► KBProgrammingDelphi for W...Language Basics   Print This     
  From the December 2009 Issue of Prestwood eMag
 
Delphi Language Basics:
Delphi Case Sensitivity (No)
 
Posted 10 years ago on 10/23/2008 and updated 10/24/2009
Delphi Code Snippet:
 A flashcard from our Delphi Flashcards Library
 A code snippet from our Delphi Code Snippets Page

KB101340



Languages Focus: Case Sensitivity

Case sensitiviy in this case is referring to commands and variable names. For example, are "printf" and "PrintF" equivalent? Are fullname and FullName equivalent? When you create commands, operations, methods, or variables should you worry about case?

Delphi Case Sensitivity

Object Pascal is generally not case sensitive.

Syntax Example:

Variables and commands are not case sensitive.

var
FullName: String;
begin
fullname := 'Mike Prestwood';
ShowMessage(fullNAME);
SHOWMESSAGE(FULLNAME);
showmessage(fullname);
end;

Cannot Declare Different Cased Variables

The compiler will not let you compile two variables within the same scope with the same name even with different case:

var
  MyName : String;
  MYNAME : String; //Compiler error!

Wrong Cased Variables Legal

Although you probably should stick with consistent casing, it is legal. If can declare a variable with one case and to use it with another case.

For example:

//The following mixed case varialbes work:
var
MyName : String;
begin
myname := 'Lisa';
ShowMessage('Hello ' + MYNAME);
end;

More Info

FAQ:  Camel versus Pascal Casing

Comments

1 Comments.
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First Comment
Comment 1 of 4

Thank you for doing these sample questions! Question#8 could be clarified a bit more though to specify that the different case variables cannot be used within the same scope (thus the answer is False). At first I thought the question was asking if either case could be used in Delphi (I was thinking different scopes), which would lead to a True answer.

---
Janice
Posted 43 months ago

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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?

In Delphi you can declare and make use of same named-different case variables (two distinct variables) as in the following:

MyName : String;
MYNAME : String;
Answer:
  • True
  • False

  •  KB Article #101340 Counter
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