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Interview Questions - Data Structures

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1.
What is data structure?
A data structure is a way of organizing data that considers not only the items stored, but also their relationship to each other. Advance knowledge about the relationship between data items allows designing of efficient algorithms for the manipulation of data.
2.
List out the areas in which data structures are applied extensively?
  1. Compiler Design,
  2. Operating System,
  3. Database Management System,
  4. Statistical analysis package,
  5. Numerical Analysis,
  6. Graphics,
  7. Artificial Intelligence,
  8. Simulation
3.
What are the major data structures used in the following areas : RDBMS, Network data model and Hierarchical data model.
  1. RDBMS = Array (i.e. Array of structures)
  2. Network data model = Graph
  3. Hierarchical data model = Trees
4.
If you are using C language to implement the heterogeneous linked list, what pointer type will you use?
The heterogeneous linked list contains different data types in its nodes and we need a link, pointer to connect them. It is not possible to use ordinary pointers for this. So we go for void pointer. Void pointer is capable of storing pointer to any type as it is a generic pointer type.
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