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What is the difference between index and subscript?
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Answer Posted / manjunath
ubscript - Subscript is used to access elements in array.
Index also used for the same purpose.
Ex. 01 WS-GROUP.
05 WS-MONTH PIC X(3) OCCURS 12 TIMES.
To access 2nd month we sepcify WS-MONTH(2).
Value enclosed in brackets is called subscript ( in this case 2 ).
You can use INDEX for the same.
Ex. 01 WS-GROUP.
05 WS-MONTH PIC X(3) OCCURS 12 TIMES INDEXED BY WS-INDX.
In above example WS-INDX is a INDEX data item.
we can use this variable to access the elements in the array.
If you want to access 2nd element in the array. need to write the code as follows
SET WS-INDX TO 2.
DISPLAY " 2nd element in array " , WS-INDX.
An index is similar to a subscript, but internal value in the variables are different..
Normaly subscript refer the occurance number of the item in array. in our example that is 2. means to refer second occurance we use number 2.
In case of index, to refer second element of your array, it shoud contains value of displacement from the starting of the arrary. i.e, in our example we used SET command to set value in index field WS-INDX. after execution of this command
WS-INDX contain the value 3. To refer third element it should contains the value of
6, for fourth element it should contain the value of 9 ( in our example array element size is 3 ).
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