Page 79 - DCAP407_DATA_STRUCTURE

Data Structure

2 Gender
2 Birthday //group item
3 Month // sub item
3 Day
3 Year
2 Father
3 Name
3 Age
2 Mother
3 Name
3 Age
2 Address
3 Dno
3 Road
3 Area

The number to the left of each identifier is known as level number. Each group
item is followed by its sub items. The level of sub items is 1 more than the level of
the group item.
In a record structure, some of the identifiers may also be referred to as arrays of elements. In the above
example, suppose the first line of the structure is replaced by
1 Application (20)
This indicates that there is a file of 20 records, and the different records in the file can be distinguished
by using the usual subscript notation.

That is, we will write
Application 1 , Application 2, Application 3
Or
Application [1], Application [2], Application [3]
to denote the different records in the file.
4.6.1 Indexing Items in a Record

Suppose, we want to access few data items in a record, then we cannot simply write the data name of
the item. This is because the name might appear in different places in the record.

The structure of the kindergarten application record is as follows:
1 Application
2 Name
2 Gender
2 Birthday
3 Month
3 Day
3 Year
2 Father
3 Name
3 Age
2 Mother
3 Name
3 Age
2 Address
3 Dno
3 Road
3 Area

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