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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 variable length records?
Answer:
Use RECORD CONTAINS min TO max CHARACTERS clause in FD. Define RECORD-LENGTH field in the record. For VSAM, use RECORD VARYING IN SIZE. Access actual length via LENGTH OF or special register. Handle both fixed and variable portions appropriately.
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Q: Explain STRING and UNSTRING operations
Answer:
STRING concatenates multiple fields into one: STRING field-1 DELIMITED BY SPACE field-2 INTO output-field. UNSTRING splits one field into multiple: UNSTRING input-field DELIMITED BY ',' INTO field-1 field-2. Both support POINTER for position tracking and OVERFLOW handling.
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Q: How does INSPECT work?
Answer:
INSPECT examines/modifies string contents. INSPECT field TALLYING counter FOR ALL 'X'. INSPECT field REPLACING ALL 'A' BY 'B'. INSPECT field CONVERTING 'abc' TO '123'. Useful for data validation, transformation, and counting characters.
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Q: What is 88-level condition name?
Answer:
88-level defines condition names for field values. 01 WS-STATUS PIC X. 88 VALID-STATUS VALUE 'Y'. 88 INVALID-STATUS VALUE 'N'. Use in IF: IF VALID-STATUS. Set using SET VALID-STATUS TO TRUE. Makes code self-documenting.
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Q: What is RENAMES clause?
Answer:
RENAMES (66-level) creates alternative groupings of elementary items. 01 REC. 05 FIELD-A PIC X(5). 05 FIELD-B PIC X(5). 05 FIELD-C PIC X(5). 66 FIELDS-AB RENAMES FIELD-A THRU FIELD-B. Provides different data views without memory overhead.
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Q: Explain START statement for VSAM
Answer:
START positions for sequential READ. START filename KEY IS EQUAL/GREATER/NOT LESS THAN key-field. After successful START, READ NEXT retrieves records sequentially from that position. INVALID KEY handles not-found condition.
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Q: How to handle packed decimal data?
Answer:
Packed decimal (COMP-3) stores 2 digits per byte, sign in low nibble. PIC S9(5) COMP-3 uses 3 bytes. For I/O, often must convert to display. Use MOVE to display field or NUMVAL function. Handle sign separately if needed.
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Q: What is MOVE CORRESPONDING?
Answer:
MOVE CORRESPONDING moves all fields with matching names between groups. MOVE CORR INPUT-REC TO OUTPUT-REC. Only moves if names match exactly. Moves all matches, not just first. Useful for record transformations. Debug carefully-silent partial moves.
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Q: Explain JUSTIFIED RIGHT clause
Answer:
JUSTIFIED RIGHT aligns alphanumeric receiving field contents to right. 05 WS-NAME PIC X(10) JUSTIFIED RIGHT. MOVE 'ABC' TO WS-NAME gives ' ABC'. Default is left justified. Only for alphanumeric elementary items.
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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: How to use UNSTRING with TALLYING?
Answer:
UNSTRING field-1 DELIMITED BY ',' INTO field-2 field-3 TALLYING IN count-var. Count-var shows how many receiving fields got data. With COUNT IN, tracks characters per field. ALL delimiter allows multiple consecutive delimiters as one.
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Q: Explain SYMBOLIC CHARACTERS
Answer:
SPECIAL-NAMES. SYMBOLIC CHARACTERS NULL-CHAR IS 1. Assigns name to ordinal position in collating sequence. Position 1 is X'00' in EBCDIC. Use: MOVE NULL-CHAR TO field. Define non-printable characters readably.
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Q: What is XML GENERATE?
Answer:
XML GENERATE creates XML from data. XML GENERATE output FROM data-item. Optional: COUNT IN length, WITH ENCODING, WITH XML-DECLARATION. Generates element for each field. Names from data names. COBOL 5+ feature.
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Q: How to define FILE-CONTROL?
Answer:
SELECT file-name ASSIGN TO ddname. ORGANIZATION IS INDEXED. ACCESS MODE IS DYNAMIC. RECORD KEY IS key-field. ALTERNATE RECORD KEY IS alt-key. FILE STATUS IS ws-status. Maps COBOL file to physical dataset.
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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 is attribute byte?
Answer:
Attribute byte controls field display. In BMS: ATTRB=(PROT,BRT). Protected, unprotected. Bright, normal, dark. MDT (Modified Data Tag) for transmission. Set in map or program.
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Q: How to use CURSOR option?
Answer:
CURSOR positions cursor on SEND MAP. EXEC CICS SEND MAP CURSOR(pos). Position number from 0. Or CURSOR option in symbolic map (-1 in length field). Controls data entry flow.
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Q: Explain DATAONLY option
Answer:
DATAONLY sends only changed data. EXEC CICS SEND MAP DATAONLY FROM(data). No map formatting. Faster for updates. Fields must exist on screen. Use after initial MAPONLY.
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Q: What is FRSET?
Answer:
FRSET (Field Reset) resets MDTs. EXEC CICS SEND MAP FRSET. Only changed fields transmitted back. Efficiency. Without FRSET, all unprotected transmitted. Use for repeat maps.
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Q: Explain symbolic map structure
Answer:
Symbolic map copybook. Field name with L (length), F (flag), A (attribute), I (input), O (output). Set -1 in length for cursor. Check flag for modified. Program data area.
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Q: What is DCLGEN?
Answer:
DCLGEN generates COBOL declarations from table. DCLGEN TABLE(name) LIBRARY(dataset) STRUCTURE(host-struct-name). Creates copybook with field definitions. Essential for maintaining table-program consistency.
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Q: What is the purpose of COPY statement?
Answer:
COPY includes copybook members at compile time, promoting code reuse and standardization. Syntax: COPY copybook-name. REPLACING clause allows field substitution. Copybooks typically contain record layouts, working-storage definitions, and common routines.
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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 CORRESPONDING in COBOL?
Answer:
CORRESPONDING (CORR) operates on fields with matching names. MOVE CORRESPONDING record-1 TO record-2 moves all matching fields. ADD CORRESPONDING does arithmetic. Reduces code but requires careful naming. Not recommended for performance-critical code.
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Q: What is FILE STATUS and common codes?
Answer:
FILE STATUS is a 2-byte field capturing I/O operation results. 00=success, 10=end-of-file, 22=duplicate key, 23=record not found, 35=file not found, 39=file attribute mismatch, 41=file already open, 47=not opened input. Essential for error handling.
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Q: How does ACCEPT and DISPLAY work?
Answer:
ACCEPT reads from console/system: ACCEPT WS-DATE FROM DATE, ACCEPT WS-INPUT FROM CONSOLE. DISPLAY writes to console: DISPLAY 'Message' WS-FIELD. UPON clause specifies destination. Limited in batch; mainly for debugging or simple interaction.
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Q: What is SORT and MERGE in COBOL?
Answer:
SORT orders records: SORT SORT-FILE ON ASCENDING KEY-FIELD USING INPUT-FILE GIVING OUTPUT-FILE. INPUT/OUTPUT PROCEDURE allows processing during sort. MERGE combines pre-sorted files: MERGE SORT-FILE ON KEY USING FILE-1 FILE-2 GIVING OUTPUT-FILE.
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Q: What is reference modification?
Answer:
Reference modification extracts substring: WS-FIELD(start:length). WS-NAME(1:3) gets first 3 characters. Can use in MOVE, IF, DISPLAY. Start position is 1-based. Length optional (to end). More flexible than REDEFINES for variable positions.
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Q: How to use intrinsic functions?
Answer:
COBOL-85 intrinsic functions: FUNCTION LENGTH(field), FUNCTION CURRENT-DATE, FUNCTION UPPER-CASE(field), FUNCTION NUMVAL(field), FUNCTION MOD(a,b), FUNCTION INTEGER-OF-DATE(date). Use in expressions or with COMPUTE. Return values only, no side effects.
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Q: Explain BLANK WHEN ZERO clause
Answer:
BLANK WHEN ZERO displays spaces when numeric field contains zero. 05 WS-AMOUNT PIC Z(5)9.99 BLANK WHEN ZERO. Shows blank instead of 0.00. Only for numeric-edited or numeric display fields. Improves report readability.
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Q: How to use SUBTRACT CORRESPONDING?
Answer:
SUBTRACT CORRESPONDING subtracts matching fields. SUBTRACT CORR group-1 FROM group-2. Each matching numeric field in group-2 decreased by corresponding group-1 value. Use ROUNDED and SIZE ERROR options. Limited to numeric fields.
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Q: What is CLASS condition?
Answer:
CLASS tests character content. IF field IS NUMERIC/ALPHABETIC/ALPHABETIC-LOWER/ALPHABETIC-UPPER. Custom classes in SPECIAL-NAMES: CLASS VOWELS IS 'A' 'E' 'I' 'O' 'U'. Then IF char IS VOWELS. Useful for validation.
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Q: What is CURSOR IS clause?
Answer:
In Screen Section, CURSOR IS field-name positions cursor. ACCEPT screen-name WITH CURSOR. Runtime positions to specified field. Can set dynamically. Used in interactive COBOL (CICS typically handles cursor differently).
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Q: How to define OCCURS ASCENDING?
Answer:
05 TABLE OCCURS 100 ASCENDING KEY IS CODE-FIELD INDEXED BY IDX. 10 CODE-FIELD PIC X(5). 10 DATA-FIELD PIC X(20). ASCENDING means lower values first. Required for SEARCH ALL. DESCENDING also available. Key must be within occurrence.
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Q: Explain FUNCTION LENGTH
Answer:
FUNCTION LENGTH returns byte count. FUNCTION LENGTH(field-name). For group items, includes all subordinates. For variable OCCURS, actual current length. Use in COMPUTE, MOVE, comparisons. Often used with STRING pointer initialization.
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Q: Explain JSON GENERATE
Answer:
JSON GENERATE creates JSON from data. JSON GENERATE output FROM data-item. NAME clause for custom keys. SUPPRESS clause omits fields. COUNT IN length. COBOL V6+ feature. Generates name-value pairs from structure.
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Q: Explain DFSORT utility
Answer:
DFSORT sorts/merges files. SYSIN has SORT FIELDS=(1,10,CH,A). SORTIN=input, SORTOUT=output. Options: INCLUDE/OMIT for filtering, OUTREC/INREC for reformatting, SUM for summarization. ICETOOL provides extended functions.
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Q: How to SEND MAP to terminal?
Answer:
EXEC CICS SEND MAP(mapname) MAPSET(mapsetname) FROM(symbolic-map) ERASE. CURSOR option positions cursor. FREEKB unlocks keyboard. ALARM sounds alarm. MAPONLY sends without data. DATAONLY sends only modified fields.
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Q: What is RECEIVE MAP?
Answer:
EXEC CICS RECEIVE MAP(name) MAPSET(mapset) INTO(symbolic-map). Gets terminal input. Modified fields only (MDT). Check EIBAID for key pressed. MAPFAIL if no data. Symbolic map populated with input.
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Q: How does MERGE work?
Answer:
DFSORT MERGE combines pre-sorted files. SORTIN01, SORTIN02, etc. inputs. MERGE FIELDS=(1,10,CH,A). Files must be sorted on merge key. Output one sorted file. Preserves input order for equal keys.
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Q: What is BIF DEEDIT?
Answer:
BIF DEEDIT removes edit characters. EXEC CICS BIF DEEDIT FIELD(data) LENGTH(len). Converts edited numeric to raw. Removes $, commas, etc. Useful for BMS numeric input.
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Q: How to set field attributes?
Answer:
Modify A field in symbolic map. DFHBMUNP=unprotected, DFHBMPRO=protected, DFHBMBRY=bright. Move to field-A before SEND. Dynamic attribute control.
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Q: What is LENGERR?
Answer:
LENGERR is length error. Data too large for area, or length specification wrong. Check LENGTH values. Common on RECEIVE. Ensure adequate receiving field.