VMS Help FORTRAN, Error Messages, Compilation Errors, INVCONSTR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SEVERITY:  F

  MESSAGE TEXT:  Invalid control structure using ELSE IF, ELSE, or
  END IF

  EXPLANATION:  The order of ELSE IF, ELSE, or END IF statements is
  incorrect.

  ELSE IF, ELSE, and END IF statements cannot stand alone.  ELSE IF
  and ELSE must be preceded by either a block IF statement or an ELSE
  IF statement.  END IF must be preceded by either a block IF, ELSE
  IF, or ELSE statement.  Examples:

    1.   DO 10 I=1,10
             J = J + I
             ELSE IF (J .LE. K) THEN

         Error: ELSE IF preceded by a DO statement.

    2.   IF (J .LT. K) THEN
             J = I + J
         ELSE
             J = I - J
         ELSE IF (J .EQ. K) THEN
         END IF

         Error: ELSE IF preceded by an ELSE statement.