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gateya.in/learn/compiler-design/lexical-analysis
Module 212 min read

Lexical Analysis

The lexical analyzer (scanner) is the first phase of a compiler. It reads the source program character by character and groups them into lexemes, producing tokens as output.

A token is a pair consisting of a token name and an optional attribute value. The token name is an abstract symbol representing a kind of lexical unit.

// Token structure
Token = <token_name, attribute_value>

For example, in the statement int x = 42; the lexer produces:

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GATE CS 2025 — Full Mock #1
65 Questions • 3 Hours • 100 Marks
Time Remaining
02:41:33
Q.14MCQ2 MarksCompiler Design

Consider the following grammar:

S → aAB | bBA
A → aA | a
B → bB | b

The language generated by the above grammar is:

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