Podcast
Questions and Answers
What is the main purpose of the Lex program in compiler design?
What is the main purpose of the Lex program in compiler design?
- To create lexical analyzers or tokenizers (correct)
- To evaluate the performance of compiler designs
- To generate parsers for lex files
- To install Flex/Bison applications
How is the course's lab evaluation distributed?
How is the course's lab evaluation distributed?
- Class Performance 15%, Lab Quiz 20%, Lab Report 15%
- Attendance 20%, Lab Assignments 15%, Final 30%
- Attendance 10%, Lab Evaluation 15%, Lab Quiz 20%
- Attendance 10%, Lab Final 30%, Viva 10% (correct)
What does the acronym YACC stand for?
What does the acronym YACC stand for?
- Yet Another Configuration Command
- Yet Another Compiler Compiler (correct)
- Your Arbitrary Compiler Code
- Yield Another Compiler Creation
Which program is referred to as a fast lexical analyzer generator?
Which program is referred to as a fast lexical analyzer generator?
Which of the following is NOT a component of the lab report format?
Which of the following is NOT a component of the lab report format?
In which week is the Lab Final scheduled according to the course schedule?
In which week is the Lab Final scheduled according to the course schedule?
What should students ensure when collaborating with peers for lab tasks?
What should students ensure when collaborating with peers for lab tasks?
Which of the following topics is covered in Week 5 of the course schedule?
Which of the following topics is covered in Week 5 of the course schedule?
What is the purpose of the command ' yylex();' in the main function?
What is the purpose of the command ' yylex();' in the main function?
Which step is necessary before running MinGW commands from any command prompt or terminal window?
Which step is necessary before running MinGW commands from any command prompt or terminal window?
What is the significance of the line 'int i = 0;' in the Lex code?
What is the significance of the line 'int i = 0;' in the Lex code?
What type of characters does the regular expression '([a-zA-Z0-9])*' match?
What type of characters does the regular expression '([a-zA-Z0-9])*' match?
What occurs when the newline character '
' is matched in the rules section?
What occurs when the newline character ' ' is matched in the rules section?
Which of the following best describes the purpose of the flex tool?
Which of the following best describes the purpose of the flex tool?
Which library functions are included in the Lex code to support input/output operations?
Which library functions are included in the Lex code to support input/output operations?
What does the symbol '' signify in the regular expression '([a-zA-Z0-9])'?
What does the symbol '' signify in the regular expression '([a-zA-Z0-9])'?
Flashcards
Lexical Analyzer
Lexical Analyzer
A program that reads input text and breaks it down into a sequence of meaningful units called tokens. It's like a word detector for code.
Lex
Lex
A program that generates lexical analyzers. It takes a description of the tokens and outputs code to recognize them.
YACC
YACC
A program that generates parsers. It takes a grammar for a programming language and produces code that can check if a program follows the rules.
Flex
Flex
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Grammar
Grammar
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Parser
Parser
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Tokens
Tokens
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Flex/Bison
Flex/Bison
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Flex Installation Step 1
Flex Installation Step 1
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Flex Installation File
Flex Installation File
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Code::Blocks Installation
Code::Blocks Installation
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MinGW's 'bin' Directory
MinGW's 'bin' Directory
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Adding MinGW's 'bin' to Environment PATH
Adding MinGW's 'bin' to Environment PATH
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Adding Flex's 'bin' to Environment PATH
Adding Flex's 'bin' to Environment PATH
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Flex Declaration/Definition Section
Flex Declaration/Definition Section
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Flex Rules Section
Flex Rules Section
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Study Notes
Course Information
- Course: CSE-3104 Compiler Lab
- Lab Number: LAB-01
Class Time
- Every Thursday
- 8:30 AM to 11:45 AM
- Section A/B in alternate weeks (details to be announced in class)
Marks Distribution
- Attendance: 10%
- Lab Evaluation/Class Performance/Lab Assignments: 15%
- Lab Report: 15%
- Lab Quiz: 20%
- Viva: 10%
- Lab Final: 30%
Lab Report Format
- Experiment number
- Title
- Introduction
- Objective
- Task/Code
- Input/Output
- Discussion
- Lab task questions (provided in class)
Course Schedule
- Week 1: Lecture: Introduction to Lex, YACC, and Flex/Bison Installation; Lab-1, 2
- Week 3: Lab-3, 4: Basic Lex/YACC program
- Week 5: Lab-5, 6: Tokenizer Using C/C++
- Week 7: Lab-7, 8: Tokenizer Using Flex
- Week 9: Lab-9, 10: Arithmetic Calculator Using Flex/Bison
- Week 11: Lab-11, 12: Recognize a valid arithmetic expression that uses operator +, -, *and / using Lex/YACC, Lab Quiz
- Week 13: Lab-13, 14: Lab Final
Obtaining Help with Labs
- Ask during office hours
- Ask another student, but your lab must be your own
- Changing comments, variable names does not constitute a unique lab
Google Classroom Code
- wd66vkb
- Students are requested to join the google classroom within this week.
Lecture 1
- Introduction to Lex, YACC and Flex/Bison Installation
Lex, Flex & YACC
- Lex: A compiler design program that generates lexical analyzers (tokenizers)
- Flex: A fast lexical analyzer generator
- YACC: Another compiler used with Lex to generate parsers
Installation
- Step 1: Download and Install Flex
- Download link provided.
- Step 2: Install CodeBlocks (includes GCC/G++/GFortran compiler) - Skip if already installed.
- Step 3: Add MinGW's bin directory to the system's environment PATH
- Step 4: Add Flex's bin directory to the system's environment PATH
How it Works
- Create and compile a Lex file (e.g., Test.l)
- Lex compiles the file to a C program (e.g., Test.yy.c)
- Compile the C program to create an object program (e.g.,Test.out)
- Input stream goes to the object program
- Output is a sequence of tokens
Problem 1 (Lex Code Example)
- Lex program to count words
- Includes necessary header files
- Variable
ito count words (initialized to 0) - Regular expression ([a-zA-Z0-9])* is used to match words
- Newline character (\n) encountered to print the word count and reset
ito 0 yywrapandmainfunctions (essential components of Lex programs)
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