Data Structures Interview Questions and Answers
Ques 1. What is data structure?
Ans. 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.
Ques 2. List out the areas in which data structures are applied extensively?Ans. Compiler Design, Operating System, Database Management System, Statistical analysis package, Numerical Analysis, Graphics, Artificial Intelligence, Simulation
Ques 3. If you are using C language to implement the heterogeneous linked list, what pointer type will you use?Ans. 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.
Ques 4. What is the data structures used to perform recursion?Ans. Stack. Because of its LIFO (Last In First Out) property it remembers its caller, so knows whom to return when the function has to return. Recursion makes use of system stack for storing the return addresses of the function calls. Every recursive function has its equivalent iterative (non-recursive) function. Even when such equivalent iterative procedures are written, explicit stack is to be used.
Ques 5. What are the methods available in storing sequential files ?Ans. Straight merging, Natural merging, Polyphase sort, Distribution of Initial runs.
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