PRIVATE

Private data fields are the most restricted, and may not be read nor modified by outside functions and may only accessed or modified by methods defined on the class. Private fields are specified by enclosing their definitions between the keywords Private and EndPrivate. The following definition makes the Area field private in class Circle:

DEFINE CLASS Circle
  double CenterX
  double CenterY
  ReadOnly
    double Radius
  EndReadOnly
  Private
    double Area
  EndPrivate
ENDDEFINE

An attempt to print, or use a private field in an expression anywhere except within a method belonging to the fields class will result in an error.