Three dogs (Are there three dogs or one dog?) is a code snippet 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.



Related task

 Unicode variable names


MODULE  dog;
 
IMPORT  InOut;
 
TYPE    String          = ARRAY [0..31] OF CHAR;
 
VAR     dog, Dog, DOG   : String;
 
(* No compiler error, so the rest is simple  *)
 
BEGIN
  InOut.WriteString ("Three happy dogs.");
  InOut.WriteLn
END dog.