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Interprogram Communication
12.7 Calling Non-COBOL Programs from Compaq COBOL
Example 12–12 (Cont.) Calling a Fortran Program from a COBOL Program
DATA DIVISION.
WORKING-STORAGE SECTION.
01 INPUT-NUMBER.
03 INTEGER PIC 9(5).
03 DEC-POINT PIC X(1).
03 DECIMAL PIC 9(8).
01 WORK-NUMBER.
03 INTEGER PIC 9(5).
03 DECIMAL PIC 9(8).
01 WORK-NUMBER-A REDEFINES WORK-NUMBER PIC 9(5)V9(8).
01 DISPLAY-NUMBER PIC ZZ,ZZ9.9999.
PROCEDURE DIVISION.
STARTER SECTION.
SBEGIN.
MOVE SPACES TO INPUT-NUMBER.
DISPLAY "Enter number (with decimal point): "
NO ADVANCING.
ACCEPT INPUT-NUMBER.
IF INPUT-NUMBER = SPACES
GO TO ENDJOB.
CALL "SQROOT" USING BY DESCRIPTOR INPUT-NUMBER.
IF INPUT-NUMBER = ALL "*"
DISPLAY "** INVALID ARGUMENT FOR SQUARE ROOT"
ELSE
DISPLAY "The square root is: " INPUT-NUMBER
INSPECT INPUT-NUMBER
REPLACING ALL " " BY "0"
MOVE CORRESPONDING INPUT-NUMBER TO WORK-NUMBER
WORK-NUMBER-A TO DISPLAY-NUMBER
DISPLAY DISPLAY-NUMBER.
GO TO SBEGIN.
ENDJOB.
STOP RUN.
Example 12–13 shows the Fortran program SQROOT called by the program in
Example 12–12 and sample output from the programs’ execution.
The SQROOT subroutine accepts a 14-character string and decodes it into a
real variable (DECODE is analogous to an internal READ). It then calls the
SQRT function in the statement that encodes the result into the 14-character
argument.
Example 12–13 Fortran Subroutine SQROOT
SUBROUTINE SQROOT(ARG)
CHARACTER*14 ARG
DECODE(14,10,ARG,ERR=20)VAL
10 FORMAT(F12.6)
IF(VAL.LT.0.)GO TO 20
ENCODE(14,10,ARG)SQRT(VAL)
999 RETURN
20 ARG=’**************’
GO TO 999
END
12–26 Interprogram Communication