Secondary Functions of Lexical Analyser

Duration: 3 min

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Module outline

  1. Quantitative Aptitude: Ratio and Proportion (Ratios), Data Interpretation, Mixture and Alligation, Permutation and Combination, Number System, Sequence and Series (Series), Speed Time and Distance, Speed Mathematics and Basic Mathematics, Algebra, Percentage, Profit and Loss, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Partnership
  2. Reasoning Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Seating Arrangements, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Syllogisms, Blood Relations, Puzzle Solving (Puzzles), Inequality, Machine Input-Output
  3. English Language: Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Construction, Pronoun, Preposition, Conjunction, Adverb, Verb, Modals, Articles, Determiner, Interjection
  4. General Awareness: Evolution of Indian Banking (Banking & Financial Awareness), GK- Current Affairs, Static General Knowledge, Indian Economy
  5. C Concepts + MCQs (IT Specialist): C Programming by Yash Sir, C Language Core
  6. Java (IT Specialist): Java
  7. Python (IT Specialist): Python for Placements by Yash Sir, Python Basics
  8. OOPs (IT Specialist): Object Oriented Programming (OOPS)
  9. DBMS (IT Specialist): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  10. SQL (IT Specialist): SQL
  11. Software Engineering (IT Specialist): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Data Structure (IT Specialist): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  13. Operating System (IT Specialist): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  14. Compiler Design (IT Specialist): 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
  15. Computer Architecture (IT Specialist): Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Multiprocessors, Programming the Basic Computer
  16. Data Communication & Networking (IT Specialist): 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 Security
  17. Descriptive Test (Main Exam): English Writing Ability
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video lecture focuses on the secondary functions of a Lexical Analyser in compiler construction. The instructor systematically explains how the lexical analyser preprocesses source code before it reaches the syntax analyser. Key topics include the removal of comment lines to clean the code, the elimination of unnecessary whitespace characters to optimize processing, and the role of the lexical analyser in generating precise error messages with line numbers for debugging purposes.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by discussing the 'Removal of Comments lines.' A slide is displayed showing a C program code snippet with line numbers visible on the left margin. The code includes preprocessor directives like #include <stdio.h> and #include <stdlib.h> at the top. The instructor highlights specific comment sections, such as the single-line comment // Declare two variables on line 6 and the multi-line comment block starting on line 9 with /* After declaration... He explains that the lexical analyser identifies these comment markers and removes the entire comment text, ensuring that only the actual executable instructions are passed to the next phase of compilation. This process prevents the compiler from trying to interpret human-readable notes as code.

  2. 2:00 – 3:27 02:00-03:27

    The topic shifts to the 'Removal of White space characters.' A slide titled 'WHITE SPACE CHARACTERS' appears, presenting a table of escape sequences used in programming. The table lists characters such as \b for blank space, \t for horizontal tab, \v for vertical tab, and \n for new line. The instructor writes the mathematical expression c = a + b on the screen to demonstrate that spaces are removed, resulting in the compact form c=a+b. Finally, he shows a screenshot of a compiler error window with a blue background. He points to the red error bar at the bottom reading 'Error ..\SS.C 6: Undefined symbol 'a'', explaining that the lexical analyser helps correlate these error messages with the specific line number where the error occurred, aiding in the debugging process.

The lesson effectively connects the theoretical functions of the lexical analyser to practical examples. By showing how comments and whitespace are stripped away, the instructor clarifies why the syntax analyser receives a cleaner input stream. The final example of error reporting demonstrates the practical utility of the lexical analyser in the development workflow, ensuring students understand its role beyond just tokenization.

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