Diff between implicit and explicit redefine.

vinodmaanju · New User Joined: 10 May 2005 Posts: 28 Location: Pune

Hi,

One of my interviewer at IBM was asked about implicit redefine and explicit redefine and difference between them. Anyone can explain it

Thanks

senthils · Posted: Tue Jan 31, 2006 3:18 pm

Explicit redefines is the one which you give in the Working-Storage section.
ex: 05 WS-TO-DATE1 REDEFINES WS-TO-DATE

Implicit redefines is the one which comes into effect in FILE section FD. If the FD of a file contains more than one 01 level number, the second 01 level variable redefines the first 01 level variable.

ex:
FD SAMPLE-FILE.
01 SAMPLE-REC1.
02 FILLER PIC X(80).

01 SAMPLE-REC2.
02 FILLER PIC X(70).

In the above example SAMPLE-REC1 and SAMPLE-REC2 share the same memory location even though we are not doing any REDEFINES. So it is called Implicit Redefines.

vinodmaanju · New User Joined: 10 May 2005 Posts: 28 Location: Pune

Thanks Mr. senthils