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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Description: You are required to implement a Scanner program for Java programming language in any programming language. The program should be able to accept the input from the file provided by the user. The scanner will then scan the code file and identifies all the tokens and list them as the output for user. In case of an invalid token, Scanner should mention that a given token is invalid. The scanner should consider following token categories;

Pre-Processing: Before scanning the code your program shall pre-process the input code and remove all the single-line and multi-line comments from the code.

Token Categories

Keywords
- All Keywords
Special Symbols
- Assignment Operator
  - =
- Unary Operators
  - ++ -- !
- Arithmetic Operators
  - + - * / %
- Relational Operators
  - < <= > >= == !=
- Conditional Operators
  - && ||
- Symbols
  - ( ) { } [ ] . , ; : ‘’ “”
- Identifier
- Integer
  - Positive & Negative
- Real Number
  - Positive & Negative
- Character Literal
- String Literal

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