Representation Of Queue

Duration: 5 min

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Module outline

  1. About Course: About the Course
  2. Paper-2 | Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  3. Paper-2 | Databases / DBMS & SQL: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control
  4. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  5. Paper-2 | Computer Networks & Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics, Network Access Technologies, Network Security
  6. Paper-2 | Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  7. Paper-2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  8. Paper-2 | Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  9. Paper-2 | Computer Organization & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  10. Paper-2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  11. Paper-1 | General Awareness: Polity, Physics, Biology, Chemistry, Static General Knowledge, GK- Current Affairs, History, Geography, Indian Economy, Environment
  12. Paper-1 | Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Data Interpretation, Blood Relations, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Clock, Calendar, Cubes & Dices, Directions (Direction Test), Analogy, Seating Arrangements, Analytical Reasoning (Counting Figures Reasoning)
  13. Paper-1 | Quantitative Aptitude: Ratio and Proportion (Ratios), Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Speed Time and Distance, Average, Age Problems, Percentage, Profit and Loss, Time and Work, Pipe and Cistern, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Probability, Statistics, Arithmetic, Algebra
  14. Paper-1 | English: Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Cloze Test (Cloze Passage)
  15. Coal India Previous Year Paper:
  16. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus
  17. Coal India Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the linear array representation of queues using two pointer variables, FRONT and REAR. The instructor demonstrates how to initialize the queue by populating an array and positioning pointers at the first and last elements. He contrasts this with linked list implementations and defines the fundamental FIFO (First In First Out) property. Key operations like insertion and deletion are explained through pointer arithmetic and visual diagrams, including a real-world analogy of people waiting in line at an ATM. The lesson emphasizes the specific conditions required for empty queues and the mathematical updates to pointers during standard operations.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The session begins by defining the structure of a queue using a linear array named QUEUE. The instructor draws a row of eight empty boxes and fills the first four with the numbers 1, 2, 3, and 4. He explicitly marks the FRONT pointer at the first element (index 0) and the REAR pointer at the last element (index 3). To provide context, he also sketches a linked list representation below the array, showing nodes labeled a, b, c, and d connected by arrows, with FRONT pointing to 'a' and REAR pointing to 'd'. This visual comparison helps students understand that while the underlying storage differs, the logical flow remains consistent.

  2. 2:00 – 5:00 02:00-05:00

    The lecture transitions to queue operations and conditions. The text states that FRONT = NULL indicates an empty queue. The instructor explains that deleting an element increases the FRONT value by 1, demonstrated by crossing out the number 1 and moving the FRONT arrow to 2. Conversely, adding an element increases the REAR value. He defines a queue as a linear list where deletions occur at the front and insertions at the rear. A diagram of people standing in a line at an ATM is drawn to illustrate the FIFO concept, labeling the start of the line as FRONT and the end as REAR. The text on screen reinforces that terms 'Front' and 'Rear' are used specifically when the linear list is implemented as a queue.

  3. 5:00 – 5:13 05:00-05:13

    In the final segment, the focus remains on the insertion logic. The on-screen text explicitly displays the formula REAR = REAR + 1. The instructor emphasizes that whenever an element is added to the queue, the REAR pointer must be incremented to point to the new location. The visual shows an arrow indicating the movement of the REAR pointer to the right, reinforcing the concept of expanding the queue within the array structure. This specific rule ensures that the next insertion happens at the correct index.

The video effectively bridges the gap between abstract data structure definitions and concrete implementation details. By using both array and linked list diagrams alongside real-world analogies, the instructor clarifies how pointers manage the dynamic nature of queue elements. The progression from initialization to specific pointer arithmetic rules provides a complete foundational understanding of queue mechanics.

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