Long floating-point number

Sample Fortran usage COBOL subroutine
REAL*8 X
X = 5.0D0
CALL FCBCLFP(X)
PRINT *,
1  'UPDATED VALUE IN FORTRAN:', X
END
IDENTIFICATION DIVISION.
PROGRAM-ID. FCBCLFP.
ENVIRONMENT DIVISION.
DATA DIVISION.
LINKAGE SECTION.
1   X  USAGE IS COMPUTATIONAL-2.
PROCEDURE DIVISION USING X.
  DISPLAY "COBOL ARG VALUE: ", X.
  ADD 1.0E0 TO X.
  EXIT PROGRAM.
END PROGRAM FCBCLFP.