The logical or mathematical model of a particular organisation of data is called data structure. It is the representation of the logical relationship existing between individual elements of the data.   In other words data structure is collection of data elements whose organisation is characterized by accessing operations that are used to store and retrieve the individual data elements.  A data structure mainly specifies the following things:-    i> Organisation of data.   ii> Accessing methods.  iii> degree of associativity.  iv> Processing alternative code for information. * Data structure is the basic building blocks of the program. * |The data structure is of two types:-  1. Primitive data structure.  2. Non-Primitive data structure. 1. Primitive data structure:-    These are the basic data structures and they are directly operated by a machine instructions.       In general they have different representations for different computers. It is also k