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    Compiler Design Short Notes for GATE CS

    GATE CS Compiler Design: 1 units and 6 chapters, weightage from 43 previous year questions across 10 papers, a study order by exam weight and 25 practice ques

    A question from this chapter

    Question 1
    Level 1: Warm-up

    Which compiler phase is responsible for reading the source code character stream and grouping it into meaningful units called tokens?

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    Compiler Design Short Notes for GATE CS

    GATE CS Compiler Design: 1 units and 6 chapters, weightage from 43 previous year questions across 10 papers, a study order by exam weight and 25 practice questions.

    About Compiler Design Short Notes

    Quick revision sheets for Compiler Design in GATE CS. Every chapter is condensed into key formulas, shortcuts and common traps so you can revise 6 chapters fast before the exam.

    GATE CS Compiler Design Unit-wise Weightage from Past Papers

    We counted every GATE CS Compiler Design previous year question in our bank (43 questions from 10 papers) and grouped them by unit.

    UnitChaptersPYQsShare of sectionAvg per paper
    Compiler Design643100%4.3

    Suggested Compiler Design Study Order for GATE CS

    1. Compiler Design: 100% of past Compiler Design questions, about 4.3 per paper.

    Start where the marks are. Units at the top of this list have appeared most often in past GATE CS papers.

    Units in GATE CS Compiler Design

    All Compiler Design chapters

    One Solved Question from Each Compiler Design Chapter

    Question 1 · Compiler Phases, Lexical Analysis and Semantic Processing MCQ

    Which compiler phase is responsible for reading the source code character stream and grouping it into meaningful units called tokens?

    1. A.

      Lexical Analyzer

    2. B.

      Syntax Analyzer

    3. C.

      Semantic Analyzer

    4. D.

      Intermediate Code Generator

    Correct Answer:

    A

    Step-by-Step Solution

    Key idea: This is a direct recall question about compiler phase responsibilities.

    Step 1: Recall the primary function of the Lexical Analyzer. It scans the source code character by character and groups them into meaningful sequences called tokens (e.g., keywords, identifiers, operators).

    Step 2: Verify other options. Syntax Analyzer builds parse trees from tokens. Semantic Analyzer checks for logical consistency and type compatibility. Intermediate Code Generator produces an abstract intermediate representation.

    Answer: A