Case-sensitivity of identifiers

Case-sensitivity of identifiers is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Three dogs (Are there three dogs or one dog?) is a code snipped used to illustrate the lettercase sensitivity of the programming language. For a case sensitive language, the identifiers dog, Dog and DOG are all different and we should get the output:

The three dogs are named Benjamin, Samba and Bernie.

For a language that is lettercase insensitive, we get the following output:

There is just one dog named Bernie.

Euphoria

Works with: Euphoria 4.0.0

<lang Euphoria>-- These variables are all different sequence dog = "Benjamin" sequence Dog = "Samba" sequence DOG = "Bernie" printf( 1, "The three dogs are named %s, %s and %s\n", {dog, Dog, DOG} )</lang>

J

<lang j> NB. These variables are all different

  dog=: 'Benjamin'
  Dog=: 'Samba'
  DOG=: 'Bernie'
  'The three dogs are named ',dog,', ',Dog,', and ',DOG

The three dogs are named Benjamin, Samba, and Bernie </lang>

Java

<lang java>String dog = "Benjamin"; String Dog = "Samba"; //in general, identifiers that start with capital letters are class names String DOG = "Bernie"; //in general, identifiers in all caps are constants //the conventions listed in comments here are not enforced by the language System.out.println("There are three dogs named " + dog + ", " + Dog + ", and " + DOG + "'");</lang>

Perl

<lang perl># These variables are all different $dog='Benjamin'; $Dog='Samba'; $DOG='Bernie'; print "The three dogs are named $dog, $Dog, and $DOG \n"</lang>

PicoLisp

<lang PicoLisp>(let (dog "Benjamin" Dog "Samba" DOG "Bernie")

  (prinl "The three dogs are named " dog ", " Dog " and " DOG) )</lang>

Output:

The three dogs are named Benjamin, Samba and Bernie

PureBasic

<lang PureBasic>dog$="Benjamin" Dog$="Samba" DOG$="Bernie" Debug "There is just one dog named "+dog$</lang>

Python

Python names are case sensitive: <lang python>>>> dog = 'Benjamin'; Dog = 'Samba'; DOG = 'Bernie' >>> print ('The three dogs are named ',dog,', ',Dog,', and ',DOG) The three dogs are named Benjamin , Samba , and Bernie >>> </lang>

Ruby

Ruby gives a special meaning to the first letter of a name. A lowercase letter starts a local variable. An uppercase letter starts a constant. So dog is a local variable, but Dog and DOG are constants. To adapt this task to Ruby, I added dOg and doG so that I have more than one local variable.

<lang ruby>module FiveDogs

 dog = "Benjamin"
 dOg = "Dogley"
 doG = "Fido"
 Dog = "Samba"   # this constant is FiveDogs::Dog
 DOG = "Bernie"  # this constant is FiveDogs::DOG

 names = [dog, dOg, doG, Dog, DOG]
 names.uniq!
 puts "There are %d dogs named %s." % [names.length, names.join(", ")]
 puts
 puts "The local variables are %s." % local_variables.join(", ")
 puts "The constants are %s." % constants.join(", ")

end</lang>

Output:

There are 5 dogs named Benjamin, Dogley, Fido, Samba, Bernie.

The local variables are dog, dOg, doG, names.
The constants are Dog, DOG.

Tcl

Tcl variable names are case sensitive: <lang tcl>set dog "Benjamin" set Dog "Samba" set DOG "Bernie" puts "The three dogs are named $dog, $Dog and $DOG"</lang> Which prints...

The three dogs are named Benjamin, Samba and Bernie