CSE-3104 Compiler Lab Quiz 01

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Questions and Answers

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?

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?

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?

Flex (A) Signup and view all the answers

Which of the following is NOT a component of the lab report format?

Presentation Slides (B) Signup and view all the answers

In which week is the Lab Final scheduled according to the course schedule?

Week 13 (D) Signup and view all the answers

What should students ensure when collaborating with peers for lab tasks?

They must submit a unique lab task (C) Signup and view all the answers

Which of the following topics is covered in Week 5 of the course schedule?

Tokenizer Using C/C++ (C) Signup and view all the answers

What is the purpose of the command ' yylex();' in the main function?

To start the lexical analysis process. (C) Signup and view all the answers

Which step is necessary before running MinGW commands from any command prompt or terminal window?

Add MinGW's bin directory to the system's environment PATH. (A) Signup and view all the answers

What is the significance of the line 'int i = 0;' in the Lex code?

It initializes a counter for the number of words. (D) Signup and view all the answers

What type of characters does the regular expression '([a-zA-Z0-9])*' match?

Alphanumeric characters including letters and digits. (C) Signup and view all the answers

What occurs when the newline character ' ' is matched in the rules section?

The current count of words is printed and reset. (D) Signup and view all the answers

Which of the following best describes the purpose of the flex tool?

To parse and analyze data based on defined patterns. (A) Signup and view all the answers

Which library functions are included in the Lex code to support input/output operations?

stdio.h and string.h (D) Signup and view all the answers

What does the symbol '' signify in the regular expression '([a-zA-Z0-9])'?

Zero or more occurrences of characters. (A) Signup and view all the answers

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 i to 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 i to 0
yywrap and main functions (essential components of Lex programs)

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Description

Test your knowledge on Compiler Lab concepts covered in CSE-3104. This quiz will focus on important topics like Lex, YACC, and Flex programming. Prepare to answer questions about the practical implementation of these tools and concepts discussed in the lab sessions.