Introduction
Difference between System software and Application software
Difference between System and Application programming
Elements of programming environment
Assembler
Loader and Linker
Macro preprocessor
Compiler
Editor
Debugger
Device Drivers
Operating System
Introduction
Difference between System software and Application software
Difference between System and Application programming
Elements of programming environment
Assembler
Loader and Linker
Macro preprocessor
Compiler
Editor
Debugger
Device Drivers
Operating System
Translation of a program written in a source language into a semantically equivalent program written in a target language
It also reports to its users the presence of errors in the source program
Relationship Among Token, Lexeme & PatternBharat Rathore
Relationship among Token, Lexeme and Pattern
Outline
Token
Lexeme
Pattern
Relationship
Tokens : A token is sequence of characters that can be treated
as a unit/single logical entity.
Examples
Keywords
Examples : for, while, if etc.
Identifier
Examples : Variable name, function name, etc.
Operators
Examples : '+', '++', '-' etc.
Separators
Examples : ',' ';' etc.
Pattern
Pattern is a rule describing all those lexemes that can represent a particular token in a source language.
Lexeme
It is a sequence of characters in the source program that is matched by the pattern for a token.
Example : “float”, “=“, “223”, “;”
Translation of a program written in a source language into a semantically equivalent program written in a target language
It also reports to its users the presence of errors in the source program
Relationship Among Token, Lexeme & PatternBharat Rathore
Relationship among Token, Lexeme and Pattern
Outline
Token
Lexeme
Pattern
Relationship
Tokens : A token is sequence of characters that can be treated
as a unit/single logical entity.
Examples
Keywords
Examples : for, while, if etc.
Identifier
Examples : Variable name, function name, etc.
Operators
Examples : '+', '++', '-' etc.
Separators
Examples : ',' ';' etc.
Pattern
Pattern is a rule describing all those lexemes that can represent a particular token in a source language.
Lexeme
It is a sequence of characters in the source program that is matched by the pattern for a token.
Example : “float”, “=“, “223”, “;”
Prof. Chethan Raj C, BE, M.Tech (Ph.D) Dept. of CSE. System Software & Operat...Prof Chethan Raj C
Prof. Chethan Raj C, BE, M.Tech (Ph.D) Dept. of CSE. System Software & Operating System Lab Manual.
1) To make students familiar with Lexical Analysis and Syntax Analysis phases of Compiler Design and implement programs on these phases using LEX & YACC tools and/or C/C++/Java.
2) To enable students to learn different types of CPU scheduling algorithms used in Operating system.
3) To make students able to implement memory management - page replacement and deadlock handling algorithms.
Credit : Nusrat Jahan & Fahima Hossain , Dept. of CSE, JnU, Dhaka.
Randomized Algorithm- Advanced Algorithm, Deterministic, Non Deterministic, LAS Vegas, MONTE Carlo Algorithm.
Modern Block Cipher- Modern Symmetric-Key CipherMahbubur Rahman
Introduction to Modern Symmetric-Key Ciphers- This lecture will cover only "Modern Block Cipher".
Slide Credit: Maleka Khatun & Mahbubur Rahman
Dept. of CSE, JnU, BD.
This slide is prepared By these following Students of Dept. of CSE JnU, Dhaka. Thanks To: Nusrat Jahan, Arifatun Nesa, Fatema Akter, Maleka Khatun, Tamanna Tabassum.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
1. An Assignment
On
LEX & YACC
Submitted By
Mahbubur Rahman
Dept. of CSE
Jagannath University, Dhaka-1100
Date: 16-01-2019
2. LEX
Lex - A Lexical Analyzer Generator
Lex is a computer program that generates lexical analyzers ("scanners" or "lexers").
Lex is commonly used with the yacc parser generator. Lex, originally written by Mike
Lesk and Eric Schmidt and described in 1975, is the standard analyzer generator on
many Unix systems, and an equivalent tool is specified as part of the POSIX standard.
Lex reads an input stream specifying the lexical analyzer and outputs source
code implementing the lexer in the C programming language.
Though originally distributed as proprietary software, some versions of Lex are
now open source. Open source versions of Lex, based on the original AT&T code are
now distributed as a part of open source operating systems such as Open
Solaris and Plan 9 from Bell Labs. One popular open source version of Lex,
called Flex, or the "fast lexical analyzer", is not derived from proprietary coding.
The structure of a Lex file is intentionally similar to that of a yacc file; files are
divided into three sections, separated by lines that contain only two percent signs,
as follows
The definition section defines macros and imports header files written in C. It is
also possible to write any C code here, which will be copied verbatim into the
generated source file.
The rules section associates regular expression patterns with C statements. When
the lexer sees text in the input matching a given pattern, it will execute the
associated C code.
The C code section contains C statements and functions that are copied verbatim
to the generated source file. These statements presumably contain code called
3. by the rules in the rules section. In large programs it is more convenient to place
this code in a separate file linked in at compile time.
Flex, A fast scanner generator
Flex is a tool for generating scanners: programs which recognized lexical patterns in
text. flex reads the given input files, or its standard input if no file names are given,
for a description of a scanner to generate. The description is in the form of pairs of
regular expressions and C code, called rules. flex generates as output a C source file,
`lex.yy.c', which defines a routine `yylex()'. This file is compiled and linked with the `-
lfl' library to produce an executable. When the executable is run, it analyzes its input
for occurrences of the regular expressions. Whenever it finds one, it executes the
corresponding C code.
The following is an example Lex file for the flex version of Lex. It recognizes strings
of numbers (positive integers) in the input, and simply prints them out.
/*** Definition section ***/
%{
/* C code to be copied verbatim */
#include <stdio.h>
%}
/* This tells flex to read only one input file */
%option noyywrap
%%
/*** Rules section ***/
/* [0-9]+ matches a string of one or more digits */
[0-9]+ {
4. /* yytext is a string containing the matched text. */
printf ("Saw an integer: %sn", yytext);
}
.|n
{/* Ignore all other characters. */ }
%%
/*** C Code section ***/
int main(void) {
/* Call the lexer, then quit. */
yylex();
return 0;
}
If this input is given to flex, it will be converted into a C file, lex.yy.c. This can be
compiled into an executable which matches and outputs strings of integers. For
example, given the input:
abc123z.!&*2gj6
the program will print:
Saw an integer: 123
Saw an integer: 2
Saw an integer: 6
5. YACC
Yacc: Yet Another Compiler-Compiler
Yacc is a computer program for the Unix operating system developed by Stephen C.
Johnson. It is a Look Ahead Left-to-Right (LALR) parser generator, generating
a parser, the part of a compiler that tries to make syntactic sense of the source code,
specifically a LALR parser, based on an grammar written in a notation similar
to Backus–Naur Form (BNF). Yacc is supplied as a standard utility on BSD and AT&T
Unix. GNU-based Linux distributions include Bison, a forward-compatible Yacc
replacement.
The input to Yacc is a grammar with snippets of C code (called "actions") attached to
its rules. Its output is a shift-reduce parser in C that executes the C snippets associated
with each rule as soon as the rule is recognized. Typical actions involve the
construction of parse trees. Using an example from Johnson, if the call node (label,
left, right) constructs a binary parse tree node with the specified label and children,
then the rule
expr: expr '+' expr {$$ = node ('+', $1, $3);}
6. recognizes summation expressions and constructs nodes for them. The special
identifiers $$, $1 and $3 refer to items on the parser's stack.
Yacc produces only a parser (phrase analyzer); for full syntactic analysis this requires
an external lexical analyzer to perform the first tokenization stage (word analysis),
which is then followed by the parsing stage proper. Lexical analyzer generators, such
as Lex or Flex are widely available. The IEEE POSIX P1003.2 standard defines the
functionality and requirements for both Lex and Yacc.
Bison, The YACC-compatible Parser Generator
Bison is a general-purpose parser generator that converts a grammar description for
an LALR (1) context-free grammar into a C program to parse that grammar. Once
you are proficient with Bison, you may use it to develop a wide range of language
parsers, from those used in simple desk calculators to complex programming
languages.
Bison is upward compatible with Yacc: all properly-written Yacc grammars ought to
work with Bison with no change. Anyone familiar with Yacc should be able to use
Bison with little trouble.