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Case Sensitivity

Languages Focus

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?

C#:   Yes

In C# commands and variable names are case sensitive. The following does NOT:

messagebox.Show("hello");  //Does not compile!

The first time you type any other case for commands or variables, VS.Net will change it to the accepted or defined case. For example, if you type messagebox.show it is converted to MessageBox.Show. Once corrected, you can break it again by editing MessageBox to messagebox and the compiler will give you an error.

Syntax Example:

The following code works:

MessageBox.Show("hello");




Cross Reference Examples:

Access VBA:   No

Access VBA is not case sensitive. Like VB Classic, if you type any other case for command or variable names, Access VBA will change it to the "accepted" or "defined" case. For example, if you type msgbox it is converted to Msgbox.

Syntax Example:  

The following code works:

MsgBox ("hello")
ASP Classic:   No

ASP Classic is not case sensitive. My preference for all languages where case sensitivity does not matter is to use camel caps as in the first example above. Many developers coming from a case sensitive language prefer to use all lowercase.

Syntax Example:  

You can use any of the following:

Response.Write "Hello"
response.write "Hello"
RESPONSE.WRITE "Hello"
REsponse.WritE "Hello"
C++:   Yes

C++ is case sensitive. In C and C++ commands and variable names are case sensitive.

Syntax Example:

The following first standard C++ snippet works:

printf("hello\n");
 
Printf("hello\n"); //>>>Does not work!
C++/CLI:   Yes

Same as standard C++. Both are case sensitive. In C and C++ commands and variable names are case sensitive.

Syntax Example:

The following first C++/CLI snippet works:

MessageBox::Show("Hello");
 
messagebox::SHOW("Hello"); //>>>Does not work!
Corel Paradox:   No

ObjectPAL is not case sensitive. My preference for ObjectPAL is to follow the camel casing promoted in the examples and help files originally developed by Borland.

Syntax Example:  

All of the following are equivalent:

msgInfo "", "Hello"
MsgInfo "", "Hello"
msginfo "", "Hello"
MSGINFO "", "Hello"

Variables are not case sensitive.

Var
FullName String
endVar
fullname="Mike Prestwood"
msgInfo("", fullNAME)
Delphi:   No

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;
Delphi Prism:   No

Prism is generally not case sensitive. Commands and variable names are not case sensitive.

Note: Prism (and Delphi for .Net) do not automatically match your typed case with the defined case as C# and VB.Net do within the Visual Studio Shell.

Syntax Example:  

The following demonstrates command and variable case insensitiviy.

var
 FullName: String;
begin
 fullname := 'Mike Prestwood';
 MessageBox.Show(fullNAME);
 MESSAGEBOX.SHOW(FULLNAME);
 messAGEbox.sHow(fullname);
end;
Java:   Yes

Java is case sensitive.

Customary casing:

  • Classes - Initial Caps (Pascal Casing)
  • Variables - Initial lowecase (Camel case)
  • Methods - Initial lowecase (Camel case)
More Info / Comment
JavaScript:   Yes

JavaScript is case sensitive. Change the case, and it no longer works! Notice the "W" in "Write" is capitalized.

<script language=JavaScript> 
<!--
document.Write("Hello"); //Does not work!
//-->
</script>

Variable names are case sensitive.

Syntax Example:

This does work:

<script language=JavaScript> 
<!--
document.write("Hello");
//-->
</script>
Perl:   Yes

Perl is case sensitive.

Syntax Example:
print "hello"; //This works.
Print "hello"; //This does not.
PHP:   Yes and No

PHP is case sensitive with variable names but not with commands. Although commands are case incenstive, I prefer to use all lowercase because it's easy to type and that's what I see most PHP coders doing and I see it on PHP.Net.

Syntax Example:

All of the following are equivalent:

echo "hello<br>";
ECHO "hello<br>";
Echo "hello<br>";
eCHo "hello<br>";

...but variables are case sensitive:

$fullname = "Mike Prestwood"; //These are two...
$FullName = "Wes Peterson";   //separate varialbes.
VB Classic:   No

VB Classic is not case sensitive. If you type any other case for commands or variables, VB Classicwill change it to the "accepted" or "defined" case. For example, if you type msgbox it is converted to MsgBox.

Syntax Example:

The following code works:

MsgBox ("hello")
VB.Net:   No

VB.Net is not case sensitive. If you type any other case for commands or variables, VB.Net will change it to the accepted or defined case. For example, if you type messagebox.show it is converted to MessageBox.Show.

Syntax Example:  

The following code works:

MessageBox.Show("hello")




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