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What is the difference between subscript and index?
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Subscripts are programmer-defined variables, of numeric type--used to reference an array.
Example:
77 WS-SUB PIC 9(04) COMP.
01 WS-TABLE.
05 WS-TABLE-ENTRY OCCURS 5 Times PIC X(80).
In PROCEDURE DIVISION:
MOVE WS-TABLE-ENTRY(WS-SUB) TO...
Indexes are defined by the programmer, but the PICTURE clause is omitted.
Example:
01 WS-TABLE.
05 WS-TABLE-ENTRY OCCURS 5 TIMES INDEXED BY WS-IDX.
10 FILLER PIC X(80).
In PROCEDURE DIVISION:
MOVE WS-TABLE-ENTRY(WS-IDX) TO...
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What is the difference between subscript and index?
COBOL 
