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LEVEL NUMBERS:
The COBOL makes use of the level number concept to explain the hierarchical data structure.
A level number is a 2 digit number. The permitted level numbers are 01 - 49, 66, 77 and 88.
All the variables are declared in the working-storage section by using appropriate level numbers.
The elementary data item can acquire either 01 or 77 as its level number. In the COBOL a division is made between the elementary and group data items. A few elementary data may be joint to form a group.
For illustration, the DAY, MONTH & YEAR may be 3 elementary data items. These may be joint to form a group data named DATE. The association may be shown pictorially as shown below:
It may be noted that the memory space referred to by the DATE is the combined memory space for DAY, MONTH &YEAR. The benefits of such a grouping are very clear. The programmer can now refer to the individual elementary items DAY, MONTH, YEAR or the group item DATE. An elementary data item is however the one which the programmer would always like to refer to as an entire and not in parts.
FILE-CONTROL paragraph for the indexed files: The common format for the SELECT clause for a file is as shown below: SELECT file-name ASSIGN TO implementor -name
Illustration of Multiply verb: (a) MULTIPLY A BY B. In this situation the value of A & B will be multiplied and the product will be stored in B. The decimal point locatio
ON SIZE ERROR OPTION: Whenever a size error occurs, the contents of the result field after the operation is unpredictable. Though, the processing is not-terminated and the co
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Environment Division: The Environment Division is the second division in the COBOL source program. It is mainly machine-dependent . The computer and all the peripheral dev
Name the divisions in a COBOL program are given below DENTIFICATION DIVISION DATA DIVISION ENVIRONMENT DIVISION PROCEDURE DIVISION.
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