Solve those: ( please don't copy from online): source code: Download the Java source code of a lexical analyzer (Main.Java). A summary of the source codeis provided below.1. The lexical analyzer program identifiesa) alphanumeric lexemes (variables) as IDENT token,b) numeric token (constant integers) as INT_LIT token, andc) all other lexemes, such as ('+','','1', (), are identified as "UNKNOWN"category. The program uses a look-up table to retrieve the token value for thesesymbols. Any symbols other than these will throw an error.2.The program reads characters of a line of code from an external text file, identifies andprints the lexemes and token numbers.3. You must type one-page report highlighting your work and any additional features youmay have added (for bonus points). Upload this report on DROPBOX. NO HANDWRITTENitems will be accepted.4. Write a line of code in a text file as follows and provide the screenshot of lexicalanalyzer output in your report. You need to write no more than one-page report. (15)your_last_name] = ([last two digits of your T-number]+[your first name]) -yourFavoriteCity85yourFavoriteState]Example: smith = (65+ohn) - norfolk85ny5. Modify the code in such a way that if it gets a character that is not in the lookup table, itprints an error message "Invalid lexeme, character not found." Test this scenario placingan example character in the text file such as '$' or '%' or '#'. Provide screenshots of yourmodified part of the code and the output. Hint: please add a case for the '=' sign.(5)6. For bonus points, investigate ways to add new features to your program as follows. Youmay obtain up to 100% additional points as bonus. Provide screenshots of the modifiedpart of the code along with the output.a. What if someone declares a variable starting with numerals (e.g., 8varX). Throwan error message suggesting that this is an illegal variable declaration.Can you detect a semicolon as the end of line (EOF)?b.c. Can you detect reserved lexemes and their tokens such as IF, WHILE, FOR, INT?

Lexical Analyzer is the primary section of the compiler additionally referred to as a scanner. It…

Download the Java source code of a lexical analyzer (Main.Java). A summary of the source code is provided below. 1. The lexical analyzer program identifies a) alphanumeric lexemes (variables) as IDENT token, b) numeric token (constant integers) as INT_LIT token, and c) all other lexemes, such as ('+', , , , , (), are identified as "UNKNOWN" category. The program uses a look-up table to retrieve the token value for these symbols. Any symbols other than these will throw an error

Download the Java source code of a lexical analyzer (Main.Java). A summary of the source code is provided below. 1. The lexical analyzer program identifies a) alphanumeric lexemes (variables) as IDENT token, b) numeric token (constant integers) as INT_LIT token, and c) all other lexemes, such as ('+', , , , , (), are identified as "UNKNOWN" category. The program uses a look-up table to retrieve the token value for these symbols. Any symbols other than these will throw an error

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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