1. Where is the concept of data structures applied extensively?
- Compiler Design
- Operating System,
- Database Management System,
- Statistical analysis package,
- Numerical Analysis,
- Artificial Intelligence,
2. Minimum number of queues needed to implement the priority queue?
Two. One queue is used for actual storing of data and another for storing priorities. .
A priority queue is an abstract data type in computer programming.
It is exactly like a regular queue or stack data structure, but additionally, each element is associated with a “priority”. stack: elements are pulled in last-in first-out-order (e.g. a stack of papers)
queue: elements are pulled in first-in first-out-order (e.g. a line in a cafeteria)
priority queue: elements are pulled highest-priority-first (e.g. cutting in line, or VIP service).
It is a common misconception that a priority queue is a heap. A priority queue is an abstract concept like “a list” or “a map”; just as a list can be implemented with a linked list or an array, a priority queue can be implemented with a heap or a variety of other methods.
3. Which is the simplest file structure? (a) Sequential (b) Indexed (c) Random
Sequential is the simplest one.
In computer science, sequential access means that a group of elements (e.g. data in a memory array or a disk file or on magnetic tape data storage) is accessed in a predetermined, ordered sequence. Sequential access is sometimes the only way of accessing the data, for example if it is on a tape. It may also be the access method of choice, for example if we simply want to process a sequence of data elements in order.
4. Different Hashing Functions based on the various methods by which the key value is found?