Lecture 10: Tokens → RE → NFA → DFA + Scanner Example (Exam Problem Solved)

In this video, we solve a complete Compiler Design exam-style problem step by step 💻 We begin by identifying the tokens present in a given language and understanding how lexical analysis works. Then we move forward to build Regular Expressions (RE) for these tokens, followed by constructing the corresponding NFA (Non-deterministic Finite Automaton) and converting it into a DFA (Deterministic Finite Automaton). After that, we apply everything in a practical way by working as a Scanner (Lexical Analyzer). We take a given input string and simulate how the scanner reads it and produces the correct tokens. 📌 What you will learn in this video: Token identification in Compiler Design Regular Expressions (RE) construction NFA design and understanding DFA conversion and simplification Scanner / Lexical Analyzer working process This video is perfect for students who want to understand Compiler Design in a simple and practical way and prepare for exams with solved examples.