Fall 2020: System Programming Lab

Resources

• An introductory tutorial on Lex.
• LEX & YACC TUTORIAL by Tom Niemann [1]
• Lex Basics on javatpoint [2]
• Lex on Windows [3]

Lab 1: Getting Started ( week of 10^th August 2020 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex Program to count number of words	Practice Set No. 1(1)
2	Write a Lex program to count the number of lines and characters in the input file.	Lab Exercise No. 1
3	Write a Lex Program to count the number of lines, tabs and spaces used in the input.	Practice Set No. 1(2)
4	Write a Lex Program to count the number of lines, words, small letters, capital letters, digits, special characters, and finally all characters.	Practice Set No. 1(3)

Lab 2 ( week of 17^th and 24^th August 2020 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex program to count the number of vowels and consonants in a given string	Practice Set No. 2(1)
2	Write a Lex program that implements the Caesar cipher. It replaces every letter with the one three letters after(right shift) in an alphabetical order, wrapping around at Z e.g a is replaced by d ,d by e ,and so on z by c.	Lab Exercise No. 2	Read about Caesar Cipher from [4]

Lab 3 ( week of 31^st August 2020 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex program that finds the longest word (defined as a contiguous string of upper and lower case letters) in the input.	Lab Exercise No. 3

Write a Lex program that distinguishes keywords, integers, floats, identifiers, operators, and comments in any simple programming language.