[next] [prev] [prev-tail] [tail] [up]

1.4 Identifiers

Identifiers denote programmer defined names for specific constants, types, variables, procedures and functions, units, and programs. All programmer defined names in the source code – excluding reserved words – are designated as identifiers.

Identifiers consist of between 1 and 127 significant characters (letters, digits and the underscore character), of which the first must be a letter (a–z or A–Z), or an underscore (_). The following diagram gives the basic syntax for identifiers.

_________________________________________________________________________________________________________
Identifiers

--identifier--|letter---|-------------------------------------------- --x --- --|letter---- |digit--| --x ---
___________________________________________________________________

Like Pascal reserved words, identifiers are case insensitive, that is, both

  myprocedure;

and

 MyProcedure;

refer to the same procedure.

Remark As of version 2.5.1 it is possible to specify a reserved word as an identifier by prepending it with an ampersand (&). This means that the following is possible:

program testdo;  
 
procedure &do;  
 
begin  
end;  
 
begin  
  &do;  
end.

The reserved word do is used as an identifier for the declaration as well as the invocation of the procedure do.

[next] [prev] [prev-tail] [front] [up]