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Q: How do I fix S0C7 Data Exception ABEND?
Answer:
S0C7 occurs when the program tries to perform arithmetic on non-numeric data.
Common Causes:
- Uninitialized numeric fields (contains spaces/garbage)
- Moving alphanumeric data to numeric field
- Reading file with wrong record layout
- Array subscript accessing wrong memory
How to Fix:
- Initialize all numeric fields to ZEROS
- Validate input before arithmetic
- Check file layouts match
- Use DISPLAY to debug field contents
* Always initialize
INITIALIZE WS-RECORD.
MOVE ZEROS TO WS-AMOUNT.
* Validate before use
IF WS-INPUT IS NUMERIC
COMPUTE WS-RESULT = WS-INPUT * 2
END-IF.
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Q: What causes S0C7 abend and how to fix it?
Answer:
S0C7 (Data Exception) occurs when non-numeric data is used in numeric operations. Common causes: uninitialized fields, incorrect data from files, wrong REDEFINES. Fix by: initializing variables, validating input data, using INSPECT/NUMVAL functions, checking file data quality.
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Q: How to handle OCCURS INDEXED tables?
Answer:
Indexed tables use INDEXED BY: 05 TBL OCCURS 10 INDEXED BY IDX. SET IDX TO 1 initializes. SET IDX UP BY 1 increments. SEARCH uses index implicitly. More efficient than subscript-index conversion.
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Q: How to use STRING with POINTER?
Answer:
STRING uses POINTER to track position: STRING field-1 DELIMITED SIZE INTO output WITH POINTER pos-var. Pointer shows next available position. Initialize before first STRING. Check for overflow. Continue STRING in multiple statements.
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Q: What is LOCAL-STORAGE SECTION?
Answer:
LOCAL-STORAGE SECTION is reinitialized each invocation. Unlike WORKING-STORAGE which retains values. Each thread gets own copy. Useful for recursive programs and threaded environments. COBOL-85+ feature. Not all compilers support equally.
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Q: What causes S0C7 in batch?
Answer:
S0C7 is data exception - non-numeric in numeric field. Check: input file data quality, initialize variables, correct REDEFINES, field alignment. Use OFFSET in dump to find statement. LE CEEDUMP shows data values. Common with new programs.
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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.
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Q: Explain PERFORM VARYING with example
Answer:
PERFORM VARYING executes a paragraph while incrementing a counter. Syntax: PERFORM para-name VARYING WS-IDX FROM 1 BY 1 UNTIL WS-IDX > 10. The counter is initialized, tested, and incremented automatically. Can have nested VARYING with AFTER clause.
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Q: What is INITIALIZE and its options?
Answer:
INITIALIZE sets fields to default values: alphabetic to spaces, numeric to zeros. Options: REPLACING NUMERIC BY value, REPLACING ALPHANUMERIC BY value. Does not initialize FILLER or REDEFINES items. Useful for clearing record areas before processing.
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Q: What is VALUE clause?
Answer:
VALUE initializes data items. 05 WS-FLAG PIC X VALUE 'Y'. 05 WS-COUNT PIC 9(3) VALUE ZEROS. 05 WS-TABLE OCCURS 5 VALUE 'INIT'. Figurative constants: SPACES, ZEROS, LOW-VALUES, HIGH-VALUES, QUOTES. Cannot use with REDEFINES target.
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Q: What is WORKING-STORAGE SECTION?
Answer:
WORKING-STORAGE SECTION declares program variables. Initialized at program load. Retains values between CALL invocations unless INITIAL program. Define all work areas, flags, counters, tables here. 01-49 levels for data, 77 for independent items.