NAME
  DEF FN Statement

SYNOPSIS
  DEF FNname[(parameterlist)] = expression
  DEF FNname[(parameterlist)]
      [statementblock]
    FNname = expression
      [statementblock]
    EXIT DEF]
      [statementblock]
    END DEF
      o parameterlist    One or more arguments in the following form:
                         variable[( )] [AS type] [, variable[( )] [AS type]]...
                         variable    A Basic variable name.
                         type        The data type of the variable (INTEGER,
                                     LONG, SINGLE, DOUBLE, STRING, or a
                                     user-defined data type).
      o expression       The return value of the function.
      o The FUNCTION statement provides a better way to define a function.

DESCRIPTION
  Defines a function.

SEE ALSO
  EXIT FUNCTION SHARED STATIC