Language Elements and Reference:xpplrm
Language Elements and Reference xpplrm Language Elements of Xbase++ Keywords

Keywords Foundation

Keywords are those words which have a special meaning to the Xbase++ compiler. These words may not be used as identifiers for variables, procedures, functions or methods. Also, they cannot be redefined. The following tables list all keywords for the Xbase++ compiler:

Keywords for declarations
ANNOUNCE RETURN *) PRIVATE *)
REQUEST STATIC PUBLIC *)
INIT LOCAL FIELD
EXIT MEMVAR *) IN
FUNCTION *) PARAMETERS *)
PROCEDURE *) DECLARE *)
  1. These keywords can be abbreviated to the first four characters

Keywords for statements
WHILE END NEXT
LOOP DO BEGIN
EXIT CASE SEQUENCE *)
ENDDO OTHERWISE *) RECOVER *)
IF ENDCASE USING
ELSE FOR ENDSEQUENCE
ELSEIF TO WITH
ENDIF STEP
  1. These keywords can be abbreviated to the first four characters

Keywords for the Xbase++ object model
CLASS VAR PROTECTED
IS READONLY
SHARING ASSIGN SHARED
ENDCLASS EXPORTED
METHOD HIDDEN

Keywords serve to structure the program code, define variables, and control the execution of the program. Only the first four characters of some keywords are significant to preserve compatibility. This means that the abbreviations containing four or more letters of the keywords can also not be used as identifiers for variables or functions. However, keywords should always be written in their entirety in program code. This improves the readability of the program code and assures that the compiler can recognize possible errors in the program code during compilation.

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