COBOL ⭐ Featured
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Q: What are the four divisions of a COBOL program?

Answer:
  1. IDENTIFICATION DIVISION - Program identification (PROGRAM-ID)
  2. ENVIRONMENT DIVISION - Hardware/software environment, file assignments
  3. DATA DIVISION - Data definitions (FILE, WORKING-STORAGE, LINKAGE SECTION)
  4. PROCEDURE DIVISION - Executable code and business logic

Only IDENTIFICATION and PROCEDURE DIVISION are mandatory.

fresher interview
JCL ⭐ Featured
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Q: What is the difference between PARM and SYSIN for passing parameters?

Answer:

PARM (EXEC statement):

  • Limited to 100 characters
  • Passed in memory to program
  • Accessed via LINKAGE SECTION
  • Good for small, simple parameters

SYSIN (DD statement):

  • No practical size limit
  • Read as a file by program
  • Can contain multiple records
  • Good for control cards, complex input
// PARM example
//STEP1 EXEC PGM=MYPROG,PARM='PARAM1,PARAM2'

// SYSIN example
//SYSIN DD *
CONTROL OPTION1
DATE=20231215
LIMIT=1000
/*
experienced interview
CICS ⭐ Featured
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Q: What is the purpose of COMMAREA in CICS?

Answer:

COMMAREA (Communication Area) is used to pass data between programs or between transactions in pseudo-conversational programming.

Uses:

  • Pass data between LINK/XCTL programs
  • Save data between pseudo-conversational transactions
  • Maximum size: 32KB

How it works:

  1. Calling program: COMMAREA option on LINK/XCTL/RETURN
  2. Called program: DFHCOMMAREA in LINKAGE SECTION
  3. Check EIBCALEN for length (0 = no COMMAREA)
* Calling program
EXEC CICS LINK
    PROGRAM('SUBPROG')
    COMMAREA(WS-DATA)
    LENGTH(100)
END-EXEC.

* Called program
LINKAGE SECTION.
01 DFHCOMMAREA PIC X(100).

IF EIBCALEN > 0
    MOVE DFHCOMMAREA TO WS-DATA
END-IF.
experienced interview
COBOL ⭐ Featured
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Q: Explain PROCEDURE DIVISION USING

Answer:
PROCEDURE DIVISION USING defines parameters for called program. Parameters match LINKAGE SECTION definitions. Order matches calling program's USING clause. Establishes addressability to passed data. BY REFERENCE/VALUE/CONTENT options inherited from CALL.
procedure-division parameters linkage
CICS ⭐ Featured
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Q: What is COMMAREA and how to use it?

Answer:
COMMAREA (Communication Area) passes data between programs and transactions. EXEC CICS LINK/XCTL COMMAREA(data) LENGTH(len). Receiving program has DFHCOMMAREA in LINKAGE. Max 32KB. Preserved across pseudo-conversational iterations.
commarea data communication
JCL ⭐ Featured
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Q: What causes S0C4 in batch?

Answer:
S0C4 is protection exception - addressing unallocated memory. Causes: uninitialized pointer, subscript out of range, incorrect LINKAGE SECTION. Check CEEDUMP for offset. Likely program bug. Use debugger to trace.
s0c4 protection abend
COBOL
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Q: What is LINKAGE SECTION?

Answer:
LINKAGE SECTION defines parameters received from calling program. Items here have no memory until CALL provides addresses via USING clause. Address established at runtime. Used for both passed parameters and dynamically addressed data.
linkage parameters subprogram
COBOL
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Q: What is POINTER data type?

Answer:
USAGE POINTER stores memory addresses. SET ptr TO ADDRESS OF data. Used with SET ADDRESS OF linkage-item TO ptr. CALL with BY REFERENCE returns addresses. Supports dynamic memory and chained structures.
pointer address dynamic