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  1.  Home
  2. COBOL400-L
  3. December 2005

Back with recursion in COBOL again!

Dear all,
I have tried to implement factorial function using recursive calls in COBOL.But I could not get the expected results although recursive calls are succesfully 
         executed. (I have checked this through debugger).
The problem is because the work variable declared in the program gets changed after the recursive calls.This problem does not happen if I use functions in C or Java because the work variable's are scoped to the individual calls.So the work variable when changed in called program it still retains the old value in the calling PGM. 
          But this is not the case in  COBOL/400.

          For example.
i am enclosing the whole code along so that you will be able to figure out what the problem 
         is

        program RICUR is the driver program which calls the ricursive pgm
        RICURTEST.
problem is beacuse the variable WK-NUMBER-STORE in RICURTEST gets changed after the recursive call to RICURTEST.This generally don't happen in C & JAVA for reasons I have 
        mentioned before.

        Can anybody suggest me a solution for this?
One option may be use ILE sub procedure to do the same,though I haven't tried it. 


Program RICUR
------------------------------

IDENTIFICATION DIVISION.
PROGRAM-ID. RICURTEST.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
SOURCE-COMPUTER. IBM-AS400.
OBJECT-COMPUTER. IBM-AS400.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 WK-BIG-NUMBER  PIC 9(10).
01 WK-NUMBER  PIC 9(4).
01 WK-DUMMY  PIC 9(10).
LINKAGE SECTION.
PROCEDURE DIVISION.
    COMPUTE WK-NUMBER = 4.
    COMPUTE WK-BIG-NUMBER = 0.
 CALL 'RICURTEST' USING WK-NUMBER WK-BIG-NUMBER.
   COMPUTE WK-DUMMY = WK-BIG-NUMBER.
STOP-RUN.


Program RICURTEST
----------------------

IDENTIFICATION DIVISION.
PROGRAM-ID. RICURTEST.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
SOURCE-COMPUTER. IBM-AS400.
OBJECT-COMPUTER. IBM-AS400.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 WK-BIG-NUMBER  PIC 9(10).
01 WK-NUMBER  PIC 9(4).
01 WK-NUMBER-STORE PIC 9(4).
LINKAGE SECTION.
01 WSSP-NUMBER PIC 9(4).
01 WSSP-BIGNUMBER PIC 9(10).
PROCEDURE DIVISION USING WSSP-NUMBER WSSP-BIGNUMBER.
  IF WSSP-NUMBER = 1
     COMPUTE WSSP-BIGNUMBER = 1
  END-IF.

  IF WSSP-NUMBER = 2
     COMPUTE WSSP-BIGNUMBER = 2
  END-IF.

   IF WSSP-NUMBER > 2
      COMPUTE WK-NUMBER-STORE = WSSP-NUMBER
      COMPUTE WK-NUMBER = WSSP-NUMBER - 1
      COMPUTE WK-BIG-NUMBER = 0
     CALL 'RICURTEST' USING WK-NUMBER WK-BIG-NUMBER
      COMPUTE WSSP-BIGNUMBER = WK-BIG-NUMBER * WK-NUMBER-STORE
  END-IF.

 GOBACK.


Thanks in anticipation,
shijith

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