COBOL Index About Index in TABLE ARRAY An index name (or just index) is an item that contains a value corresponding to an occurrence number of the table with which it is associated. INDEXED File Processing INDEX SEQUENTIAL ORGANIZATION: Records in this file are stored based on a key field which is part of record and this is also called as index. Records in this file are accessible in sequent- ial , dynamic & random mode. An index sequential file is concep- tually made up of two files, a data file and an index file. Subscript vs Index in COBOL. Hi, In a recent performance drive it was a suggested that usage of indexes was better than subscripts and would lead to performance improvement in a COBOL code. The actual setup of the index is done through COBOL. The index is limited in use. It must be used with the table that defined it and it must be controlled using either the PERFORM statement with the varying clause or the SET verb. Essentially a programmer has far more control over the manipulation of a subscript than an index. The SET clause is used to initialize INDEX or to set the value of the INDEX. Examples: a) SET index-1 to index-2 b) SET index-1 to 1 c) SET index-1 UP BY 1 d) SET index-1 DOWN BY 1. Note: ‘SET’ is also used to set the value of switch to ON/OFF. It can also be used to assign TRUE/FALSE to a conditional variable. INDEXED File Processing INDEX SEQUENTIAL ORGANIZATION: Records in this file are stored based on a key field which is part of record and this is also called as index. Records in this file are accessible in sequent- ial , dynamic & random mode. An index sequential file is concep- tually made up of two files, a data file and an index file.
Setting an index to 2, will cause the compiler to correctly calculate the byte offset and point to the 2 nd element in the table. Likewise, setting an index up by one will move the index to the next element, regardless of the size of the element. The COBOL compiler translates it into a proper offset for you. XTEMP is not a COBOL data-item; it is not defined elsewhere in the DATA DIVISION. Its only use in the program is to serve as an index to the array TEMP. It can be used as a normal data item subscript when referencing an element of an array: COBOL STRING HANDLING - Learn Delimited by size and space in COBOL. In this Tutorial you learn string, substring, with pointer, ONOVERFLOW with Examples. COBOL STRING HANDLING - Learn Delimited by size and space in COBOL. In this Tutorial you learn string, substring, with pointer, ONOVERFLOW with Examples.
The compiler calculates the value contained in the index as the occurrence number (subscript) minus 1, multiplied by the length of the table element. Therefore, for the fifth occurrence of TABLE-ITEM , the binary value contained in INX-A is (5 - 1) * 8, or 32. You can use an index-name to reference another table only COBOL Index About Index in TABLE ARRAY An index name (or just index) is an item that contains a value corresponding to an occurrence number of the table with which it is associated. INDEXED File Processing INDEX SEQUENTIAL ORGANIZATION: Records in this file are stored based on a key field which is part of record and this is also called as index. Records in this file are accessible in sequent- ial , dynamic & random mode. An index sequential file is concep- tually made up of two files, a data file and an index file. Subscript vs Index in COBOL. Hi, In a recent performance drive it was a suggested that usage of indexes was better than subscripts and would lead to performance improvement in a COBOL code. The actual setup of the index is done through COBOL. The index is limited in use. It must be used with the table that defined it and it must be controlled using either the PERFORM statement with the varying clause or the SET verb. Essentially a programmer has far more control over the manipulation of a subscript than an index.
23 Jul 2018 Index and Subscript in COBOL are the very important concepts. Both are used to reference an array or table element in COBOL programs. COBOL Differences between Subscript and Index - Learn COBOL in simple and easy steps with examples including Overview, Introduction, Coding sheet,
Specific index name can be used to reference a field from the table to which that index is assigned to index represents displacement value of the